P. J. Alling wrote:
I'd be interested in the A50 1.7 but you could probably get a lot more
for it on e-Bay than I'm willing or able to pay...
So, you reckon one of those unbelievable sums may also be reached for an
A lens, too? I have a good mind to try, now.
Toralf Lund wrote:
I'm
Glen Tortorella wrote:
Hi all,
Has anyone had of heard of any problems with the pop-up flash on the
ZX-5N (malfunctions, fails to pop up, etc.)?
It works just find on mine, but I hardly ever use it. Then again, I'm
not very careful when it comes to packing the camera in a nice camera
bag
as it
did when I first took the body out of the box.
Regards,
Glen
On Sep 6, 2007, at 12:36 PM, Toralf Lund wrote:
Glen Tortorella wrote:
Hi all,
Has anyone had of heard of any problems with the pop-up flash on the
ZX-5N (malfunctions, fails to pop up, etc.)?
It works
P. J. Alling wrote:
That said, I seldom use the built in flash, which means that it has very
few opportunities to break, and when you need just a little bit of extra
light, it's there.
Yep. Like I said earlier, in some ways I wish my MZ-5n didn't have a
flash, because I rather like stuff
was not really
high-end either, was it?).
But that's also an age-old discussion on this list...
-Adam
Toralf Lund wrote:
I really don't think concerns about the flash should hold you back from
buying a -5n, though. It probably breaks easily if you are reckless or
absent minded when
/green_center/
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Glen Tortorella wrote:
Thank you Godfrey, et. al...
Godfrey: when you say that good modern cameras allow for both CW and
multi-segment, do you mean this in terms of a setting (a switch) made
on the camera body? I ask because my ZX-M goes into CW mode when
using an older lens (i.e. an
Jaume Lahuerta wrote:
Normally there is a setting that lets you switch between multisegment, CW and
spot metering.
(Spot is when the reading is taken only in a small circle in the center of
the image).
Unfortunately, the MZ-M (ZX-M in the US) does not have it, and this is one of
the
Rebekah wrote:
I saw some Ebay, and I didn't know what it was, so I was just curious
if it was any good. :o) thanks mucho
Actually, if it's the 100 ISO version of the 400UC I used a couple of
years ago, which didn't strictly speaking have Portra printed on the
box, I'd expect it to be
Patrick Genovese wrote:
I'm going green with envy... I've been trying to find one of those.
Yeah, I suppose they are somewhat rare, but to me, I think the main
issue is finding the money to buy one. Actually, sometimes I do find it,
but I always seem to find something more sensible to spend
P R Figueiredo wrote:
What would be my options for a cheaply available pentax slr body with a
spot metering mode that works with manual focus lenses? Other features
are mostly irrelevant.
You mean a film body?
If you want a body with a separately selectable spot-metering mode, you
Igor Roshchin wrote:
Mon Aug 27 09:58:53 EDT 2007
William Robb wrote:
- Original Message -
From: David J Brooks
Subject: Re: Wedding photography
I have proven to my self over an over, if i'm going to do indoor
flash, the SB80DX and D2H are the only way
[ ... ]
With the exception of the *istD, DS(in TTL mode) and Fuji S2 Pro, all
digital flash systems are entirely pre-flash based and do not use light
reflected off the sensor to determine flash exposure. Traditional
TTL-OTF flash is more accurate than preflash-based flash, but
Jim Apilado wrote:
What was the last great 35mm slr that Pentax made? The *ist, or the
MZ-S?
I can't resist mentioning the MZ-5n, of course...
Jim A.
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AlunFoto wrote:
Toralf,
You can determine the type of communication by looking at the number
of pins on the hotshoe. If there are 3 small pins in addition to the
X-terminal, it's a digital communication flash. 2 small pins means the
flash speaks analog TTL, with the belonging voltages.
Godfrey DiGiorgi wrote:
There's always the matter of those Hasselblads left on the moon too..
You mean the Hasselblads left in the Nevada Desert, of course? ;-)
G
On Aug 25, 2007, at 7:17 AM, Rebekah wrote:
damn, if you guys are planning on being buried with cameras I'm going
to
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Digital Image Studio wrote:
On 24/08/07, Toralf Lund [EMAIL PROTECTED] wrote:
Isn't the ISO rating (of the sensor) directly linked to the
signal-to-noise ratio?
Indirectly.
Isn't wanting a lower ISO like wishing the sensor
was noisier?
No, the sensors effective
The thread started by Jostein a few days ago made me realise that I just
have to buy a ring flash. I'm looking at the cheap options, though,
specifically I very nearly ordered a Vivitar 6000 yesterday, but then I
thought I should perhaps try to find out more about it first.
Unfortunately, not
Toralf Lund wrote:
Digital Image Studio wrote:
On 24/08/07, Toralf Lund [EMAIL PROTECTED] wrote:
Isn't the ISO rating (of the sensor) directly linked to the
signal-to-noise ratio? [ ... ]
what I was trying to say, is that I think I've
read somewhere
Digital Image Studio wrote:
On 24/08/07, Toralf Lund [EMAIL PROTECTED] wrote:
Actually, Wikipedia says:
ISO Standard 12232:2006
http://www.iso.org/iso/en/CatalogueDetailPage.CatalogueDetail?CSNUMBER=3
(Photography — Digital still cameras — Determination of exposure
that the units
have adapter rings for only up to 55mm.
Thanks.
- Toralf
This works very easy even if a PTTL ringflash was available I doubt I
would want one
On 8/24/07, Toralf Lund [EMAIL PROTECTED] wrote:
The thread started by Jostein a few days ago made me realise that I just
have to buy
Toine wrote:
Some older dedicated pentax auto flashes do transmit or receive iso
and aperture information. Some flash models can be set to P mode. The
camera sets the correct aperture for the lens and the flash exposes in
normal auto mode. Is this the digital interface you mentioned.
No, I'm
graywolf wrote:
Besides the image is only 36x23.9mm how do they get off calling that full
frame? Its BS, Nikon will never make a full frame D-SLR. No one will ever buy
it...
Just thought I would get a jump on the rest of the posters.
He, he.
Personally I was going to say that
Glen Tortorella wrote:
Hello,
I am a new member--just joined today.
Welcome.
I currently own a Pentax ZX-
M. I bought it three years ago, and, at the time, I was not sure if
I would like fully manual operation. I like the ZX-M so much that it
inspired me to purchase the classic I
Toralf Lund wrote:
Glen Tortorella wrote:
Hello,
I am a new member--just joined today.
Welcome.
I currently own a Pentax ZX-
M. I bought it three years ago, and, at the time, I was not sure if
I would like fully manual operation. I like the ZX-M so much
Mark Roberts wrote:
Tom C wrote:
Native ISO of 200 is a little disappointing. Would have preferred 100
or
50.
From looking at the specs, I'd say it's probably more of a
sports/action camera - a competitor for the Canon 1D rather than 1Ds.
And putting only 12
frank theriault wrote:
This weekend my youngest, Claire, had her end-of-the-season soccer
tournament. I'll likely post some pround papa photos later. [ ... ]
http://tinyurl.com/3ypt4o
http://bp3.blogger.com/_EaTEtfR4WJw/Rsrc6V2id_I/AlQ/wbVrJkexJBo/s1600-h/claire_soccer+005.jpg
Toralf Lund wrote:
frank theriault wrote:
This weekend my youngest, Claire, had her end-of-the-season soccer
tournament. I'll likely post some pround papa photos later. [ ... ]
http://tinyurl.com/3ypt4o
http://bp3.blogger.com/_EaTEtfR4WJw/Rsrc6V2id_I/AlQ/wbVrJkexJBo/s1600-h
frank theriault wrote:
On 8/20/07, Toralf Lund [EMAIL PROTECTED] wrote:
Just another quick snapshot from the same old street:
http://www.toralf.net/bilde.php?navn=statue1
A few years ago, I would have thought that this was rather special. Now,
of course, these statue impersonators
David J Brooks wrote:
I like it.
The yellow dolly seems to add something to the shot, what i don't know.
Well, I certainly noticed it at the time, so maybe I'm doing something
right...
Thanks,
- Toralf
Dave
On 8/20/07, Toralf Lund [EMAIL PROTECTED] wrote:
Just another quick
frank theriault wrote:
On 8/21/07, Bob W [EMAIL PROTECTED] wrote:
snip
Then how can it be made 'accessible' to you? If you're not prepared to
put the effort into getting it, why should the people who made it have
to make it easy just to suit you?
snip
Personally, I think art
Fernando wrote:
To me it doesn't have to do with instant accessibility, it has to do
with the fact that a lot of this type of work doesn't speak for
itself, you can stare at some of these photos for 100 years, and you
won't get it unless you know where the artist is coming from, or that
the
Digital Image Studio wrote:
On 20/08/07, Sylwester Pietrzyk [EMAIL PROTECTED] wrote:
It seems that we already know what will Sony use in their upcoming
mid-end Alpha which shoould appear at the begining of september. It
incorporates some very interesting noise cancelling technologies. All
Just another quick snapshot from the same old street:
http://www.toralf.net/bilde.php?navn=statue1
A few years ago, I would have thought that this was rather special. Now,
of course, these statue impersonators (or instatueinators?) seem to be
popping up everywhere...
- Toralf
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for
60-70...
Lens SMC coating does matter. And some lenses in KEH are only 100-150 USD.
Gasha
Toralf Lund wrote:
David Bliss wrote:
So I'm growing increasingly frustrated with 35mm and APS-C digital.
Solutoin: medium format. But what?
Hasselblad makes the sexiest gear I've ever
Sometimes one goes through one's photos (or a box of
slides, in the old days) and wonders How did THAT get
in there??
This is one of those. There seems to be some
pavement, but I have no idea what the blue thing is.
Still, it appeals to me.
Comments welcome!
Yes, it's an interesting
AlunFoto wrote:
Strange... In the description it says:
This item is manufactured at the time of order.
Winning item will be shipped as soon as the lens is manufactured.
The delivery time is 2 ~ 3 weeks.
Which is more likely; the seller not being entirely truthful, or that
Pentax still
David Bliss wrote:
So I'm growing increasingly frustrated with 35mm and APS-C digital.
Solutoin: medium format. But what?
Hasselblad makes the sexiest gear I've ever seen. But I can't afford it even
used.
I like the larger negative area of the Pentax 67 -- after all, isn't neg
area the
Steve Desjardins wrote:
I think part of this is that most people (Notice the most part) prefer
to shoot color in digital. So they have these nice film cameras lying
around and decide to try BW.
Actually, though I wonder what format will survive. 35 mm was
convenient but as the cameras
Bob Shell wrote:
On Aug 6, 2007, at 9:44 AM, Toralf Lund wrote:
Actually, I've heard (or read) people claim that the Rollei film is
being manufactured today - by some company that bought the entire
production line from AgfaPhoto. I'm sure you find some details on the
web if you care
You're not on point though Dave (IMO). I cannot go and buy a new vinyl
record of any CD I want, can I?
Obviously, you can't, but I wouldn't be surprised if you get a higher
percentage on vinyl today than you did, say, 10 years ago.
Just after CDs got popular. vinyl was just plain obsolete.
I thought they were done as well, but they are still showing
product on
their website.
Ain't refrigerated warehouses grand!! They did one last production
of several films before they shut down and those are projected to
last from two to five years. Rollei bought the
Toralf, I used to use Rodinal many years ago and found that even when the
concentrate turned pretty dark it was still usable. However, once it durns
dark black it is probably shot.
Ok. That's very useful info. Thanks.
- Toralf
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William Robb wrote:
- Original Message -
From: Toralf Lund
Subject: OTish: Rodinal/Agefix keeping time, and how to know if they are
stillgood?
Anyhow, I was just wondering if any of you lot have any opinions on the
*actual* shelf life of photo chemicals, notably Rodinal
As you may know already, I'm still shooting and developing BW film.
Actually, I started doing it around the time when everyone switched to
digital; going backwards into the future, and enjoying it.
Anyhow, I was just wondering if any of you lot have any opinions on the
*actual* shelf life of
Jim King wrote:
An interesting image, to me at least, although the meaning of the
sign is uncertain - Gate chapel is open?.
Nearly right. You may like to know, however, that gate in Norwegian
actually means street. Apparently, you find the same word in some
English place names...
Anyhow,
Sometimes I enjoy taking pictures of signs. Not sure why. Here is one:
http://www.toralf.net/bilde.php?navn=kapell
Captured using real BW film; a very cheap one from Eastern Europe,
actually. (Fortepan 400)
Maybe I'll leave it as an exercise to find out what the text is all about...
- Toralf
it's Wimbledon fortnight, so naturally we have had torrential rain for
the duration.
He, he... I've sort of been trying to watch the match between Nadall and
that Swedish player (Söderling, is it?) on TV, but I pretty much gave it
all up this afternoon. (They started playing on Saturday, I
[ ... ]
The only downside is that it would be very nice indeed to see them
support the Pentax KA mount rather than just the K mount
specification. That would lend much more functionality to the Pentax
DSLRs metering operations.
They way I understand the last paragraph on the web
To continue the V-dub theme:
http://www.photo.net/photodb/photo?photo_id=4834201size=lg
Nice shot.
- T
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P. J. Alling wrote:
Looks like a '68 to me.
I guessed the early 60s myself, based on the configuration of the
headlights, but I don't really know when they changed that. (The lamps
are more upright on later models.)
Toralf Lund wrote:
Nothing much, but since we were discussing VW
[EMAIL PROTECTED] wrote:
Nice car. Good exposure. Unfortunate placement of the tree, but not much you
can do about that.
Yes, I think that pretty much sums it up. I'm assuming the car belongs
to someone living close to me, so maybe I'll spot it parked in a more
favourable spot some other
ann sanfedele wrote:
Ok - I got stuff up finally
http://tinyurl.com/yqkqpg
Lots of nice pictures, there...
- T
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Definately a Super Beetle.
Yep. Looks to me like a 1303 or 1303S. Although perhaps it could be a
Mexican or Brazilian model with a different designation...
Fuel injection means later than 73 or 74. They
quit importing them here in 78 or 79.
More or less the same as here, I think.
I
Nothing much, but since we were discussing VW models:
http://www.toralf.net/bilde.php?navn=vw
This one is quite a bit older than the one on annsan's photo, I think.
- Toralf
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http://cgi.ebay.com/RARE-Pentax-SMC-F-AF-1-7X-teleconverter-adapter-AS-NEW_W0QQitemZ110136569676
What the...
Did you notice that someone posted a similar link a few days ago?
(
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemih=001sspagename=STRK%3AMEWA%3AITviewitem=item=110133342168rd=1rd=1
Last night the laptop shot itself in the foot. I'm surfing along,
reading my mail, whatever, and explorer crashed. Then my other apps
started shutting down. Then windows tells me that it's encountered a
critical error and must shut down. Now it won't boot. [ ... ]
So I burned an
Michel Carrère-Gée wrote:
New DSLR: AP 50th Anniv
A chrome K10D with Spotmatic look , and DA 2.8/40
http://forums.dpreview.com/forums/readflat.asp?forum=1036thread=2345440
Nice.
It would however have been more interesting if they'd managed to squeeze
the K10D electronics into a truly
Godfrey DiGiorgi wrote:
I'm glad that gives you some ideas.
I'm happy to send you the Photoshop CS2 file with all layers intact
of what I did, if you want to see what and how I worked on it. It's
about a 2Mbyte file in .zip format if you'd like it.
Why not?
You can email it to me
Just another sign of boredom (on a rainy day):
http://www.toralf.net/bilde.php?navn=samson2
Lovely composition - the rain (and resulting lack of people) makes for
a very austere, moody shot.
Great stuff.
Yes. Thanks!
I don't know if you've ever been to Oslo, but if you have,
Nice mood.
Thanks.
In my very own personal taste it could use a little bit more of constrast.
Now that you mention it, I think I might prefer it that way myself. I
didn't do much work on the image file (which is a scan from bw film.)
How about
Hi Toralf,
I actually like the first one, maybe with just a bit more contrast but
less than 2b. 2c is way too bright and kills that mood.
Yeah, I wanted it dark because that was what the scene looked like and
felt like at the time... 2c is a rescan with a completely different
setup. I
Looking at all three, they don't express to me that feeling of dark
with glistening wetness that I think it what you're trying for. They
just seem flat and dullish in appearance.
I like the composition though, so I bunged about in a heavy handed
way with curves adjustment tools [ ...
In a message dated 4/24/2007 1:13:25 P.M. Pacific Daylight Time,
[EMAIL PROTECTED] writes:
Just another sign of boredom (on a rainy day):
http://www.toralf.net/bilde.php?navn=samson2
- T
==
Having looked at the originals and the other versions, I rather like the
Another from the upcoming Tree collection...
http://homepage.mac.com/ramarren/photo/PAW7/20b.htm
Comments, critique and good fertilizer all welcomed.
I have no special comments, really.
But I like it.
- T
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Just another sign of boredom (on a rainy day):
http://www.toralf.net/bilde.php?navn=samson2
- T
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Scott Loveless wrote:
Toralf Lund wrote:
Just had to submit this after seeing P.J. Alling's Ikea breakfast:
http://www.toralf.net/bilde.php?navn=samson
I like it.
Thanks.
- T
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Just had to submit this after seeing P.J. Alling's Ikea breakfast:
http://www.toralf.net/bilde.php?navn=samson
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Last Saturday, I decided that I would take my PZ20 out for a spin, for a
change. Unfortunately, we didn't get very far. After just 4 pictures,
the -20 decided it was time to rewind the film. This has happened once
before, and I believe I got exactly 4 shots last time, too. I've used
this body
On a somewhat happier note, it looks like I've just got myself two good
lenses for 350 Norwegian Kroner + a few hours of playing around with
screwdrivers, a drill, various solvents and some oil... That's an
M28/2.8 and a 135/3.5 - the original K version.
I've sort of been thinking I should get
Possibly, as the film has been sitting for some time partially wound, the
effort to wind it exceeded some force limiter, making the camera think it had
come to the end.
So, you think the film may have settled in such a way that winding it
was heavier than usual?
Try reloading, putting
Has anyone here tried the 2nd incarnation FA100-300 (i.e. this version:
http://www.bdimitrov.de/kmp/lenses/zooms/long/FA100-300f4.7-5.8.html) on
one of the digital Pentaxes?
I'm thinking about selling mine (the lens) to a guy with a K10D, and
want to be able to tell him that his body and this
No - but undoubtedly dozens of PS compact flashes went off that night!
True, but like I said elsewhere, what made me wonder was that several
DSLR ones also did.
John Coyle
Brisbane, Australia
- Original Message -
From: Toralf Lund [EMAIL PROTECTED]
To: Pentax Discuss pdml
Just a quick reality check.
Would any of you lot use the popup-flash when shooting something like this:
http://www.toralf.net/bilde.php?navn=kongen2
or even this
http://www.toralf.net/bilde.php?navn=kongen
???
(Disclaimer: These are pictures that are only nearly there, as you can
probably
that it's
actually a veranda ;-))?
William Robb
- Original Message -
From: Toralf Lund
Subject: On other photographers...
Just a quick reality check.
Would any of you lot use the popup-flash when shooting something like
this:
http://www.toralf.net/bilde.php?navn=kongen2
graywolf wrote:
Remember 99% of the folks out there use an auto cam permanently on P.
It turns on the flash based upon light level. Neither aesthetics nor
common sense apply.
Probably.
What struck me on this particular event, however, was that several
people with reasonably professional
Paul Stenquist wrote:
Absolutely not. On the first, the popup (or any flash) would create a
white hole in the first few rows of the crowd. With the second shot, it
would do nothing save perhaps create an unpleasant glow if there is
mist or smoke in the air.
That's what I though, more or
Tom C wrote:
Not at all in the two cases you mention. However on-camera popup flash does
come in handy at times and I'm glad it's there.
For instance, night-skiing at Bogus Basin last Sunday.
My son is on the left.
http://www.photo.net/photodb/photo?photo_id=5667668size=lg
Nice.
Vic Mortelmans wrote:
Toralf Lund schreef:
The point was that I observed many people, including some with what
looked like real cameras (if you know what I mean) using the popup flash
on this event.
No I don't... I thought that real camera's didn't have pop up flashes?
You
Another nice PUG, there. I don't have time to comment on the individual
photos right now, though.
I just thought I might mention that my entry in Open Gallery was
actually intended for the themed section - because it's a picture that
I thought came out as looking essentially black and white,
Adam Maas wrote:
The downside? The Planar 85/1.4 simply doesn't match the A* in performance.
The Upside: you can actually get one.
-Adam
Know what?
Considering how much my SMC Pentax 85mm f/1.8 cost me, used, I can't
imagine what that 1.4 must cost!
I can!
I can imagine
I can imagine it would cost about $1249 in the US.
But that's just my imagination, of course ;-)
Close. I paid a little over $100.00 more than that for my A85/1.4, just over
a year ago.
Right. My guess was of course just the price of the Zeiss lens, in its
Nikon mount
When the time
comes, Pentax will make lenses for the new sensor size (if necessary).
In the meantime, relax and enjoy the great glass that's becoming
available now.
We might want to check if those new telephoto primes, when they come out,
might also cover 35mm film. It is strange
John Francis wrote:
On Wed, Sep 20, 2006 at 06:52:46PM -0700, Joseph Tainter wrote:
The sentence I found most interesting:
These products are designed for exclusive use with
PENTAX K- and *istD-series digital SLR cameras.
So they *do* intend to keep old-style focussing ability
Antti-Pekka Virjonen wrote:
I think the actual sensors do have the 14-16 bits you mention - [ ... ]
Hi,
Yes, actually I was talking about usable bits, taking the noise into
account, thus giving 14-16bits of usable data.
This is so at least with the good quality astronomical ccd
So you are saying a 22 bit ADC is overkill. Wonder if Pentax knows that?
The marketing people probably don't know, or care; they only know they
can quote a higher number than the competitors.
The engineers probably deliberately chose to have extra bits, so as to
avoid problems with
Hi,
Wanted to add:
Maybe the raw files contain the 22 bit data. If so, you can set the ISO
to anything you wish in the post prosessing (and as many times as you
wish).
May guess is this:
The signal is converted into 22 bits without a variable gain stage (like
you say). The ISO
Hi,
French is my mother tongue (as my name suggests), and I can say that the
babelfish translation is accurate in saying that it is possible to
*act* on ... the ISO adjustment.
To my ears this means that the ISO can be somehow (?) set at
post-processing.
How they achieve such a
It's been mentioned about two point six zillion times by now that you
probably don't, though. The sensor itself doesn't have a lot more than
12-bits worth of latitude, so producing more bits in the A/D doesn't
help a lot.
I disagree with that a little. It's still the same sensor
I think push processing is a very good analogy. You can't strictly
speaking change the ISO on a digital camera - the sensor has a fixed
sensitivity. ...
... at a specified voltage input/output level. If you change the
voltage levels, you are changing the response curve and thus the
From the Pentax France Page:
Le traitement interne des fichiers RAW permet d'agir sur la taille, la
compression, la balance des blancs, le réglage des ISO (Pentax est le
seul), le ton de l'image, la saturation, la netteté et le contraste.
via Babelfish:
The internal treatment of files
Toralf Lund wrote:
From the Pentax France Page:
Le traitement interne des fichiers RAW permet d'agir sur la taille, la
compression, la balance des blancs, le réglage des ISO (Pentax est le
seul), le ton de l'image, la saturation, la netteté et le contraste. [ ... ]
But what
frank theriault wrote:
On 9/13/06, Cotty [EMAIL PROTECTED] wrote:
Made yer look.
No you didn't
I looked only at your reply.
-frank
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But what this sound like to me (who doesn't speak much French, either),
is merely that details on the ISO setting that already was applied, will
be stored in the tags of the file. (And maybe ISO adjustment will be a
somewhat more complex operation in this camera?)
- Toralf
ISO setting during PC conversion is common stuff.
ISO seting during in-camera conversion is what they claim.
That's what I thought. Except I posted something here before thinking...
I do know some French. Not much. A little less than that actually...
Like I said earlier, in other cameras,
Adam Maas wrote:
No, you're changing the conversion curve and levels. ISO is normally set
at the ADC stage.
You emulate a different ISO value by modifying the signal/pixel level in
both cases, it's no more (or less) an ISO setting just because you do it
in the analogue domain.
- Toralf
Dario Bonazza wrote:
I keep thinking in photographic terms. In my understanding, exposure depends
on:
1 - Subject's brightness
2 - Lens aperture
3 - Shutter speed
4 - Film/Sensor sensitivity
Sure you cannot change 1/2/3 during processing, but you can change 4
(sensitivity). OK,
Bob W wrote:
are they giving away free exclamation marks?
I can't see where the killer feature is that everybody was on about.
What is it?
It is a misunderstanding of what a 22-bit A/D can do...
- Toralf
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or no 3200 at all. And I do not think ISO is a function of the sensor.
IMO (but I do not know much, I'm only guessing) the sensor works the
same way whatever the ISO you choose, the difference is processing,
later.
As far as I know, it simply a question of an amplification of the signal
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