Re: Pentax K28mm 3.5 shift

[lists]

DagT wrote on Wed, 14 May 2008 14:25:50 -0700

 I suddenly bought one for about $200. (it sounds fun and I had a weak
 moment)

 Does anybody know anything about it?

I bought a used copy a couple years ago on EvilBay for about $450 and  
thought I got a decent deal, but yours certainly beats that!

I've enjoyed using it on my Pentax DSLRs but found that it tends to  
progressively underexpose when using TTL metering as I move to smaller  
apertures.  That's not usually a problem because this lens requires a  
deliberative style of shooting, allowing one to check the histogram to  
confirm (and adjust) exposure.  I'm not sure that it is all that much  
better than a normal image which has been Photoshopped to eliminate  
keystone distortion, although it should have an advantage in  
resolution because there are more pixels in the area which is  
stretched in a PS correction.

I posted some examples here:  http://www.pbase.com/jamesk8752/k28shift  
in case you are interested.

Regards, Jim


Thanks Jim, and the rest of you. 

I'll experiment a little this weekend to see how it works. I have been thinking 
about pictures with mirrors but without the photographer and a couple of other 
illusions, and the loss of resolution when doing it in PS is a good point in 
favour of such a lens.

From your examples it seems like the distortion is acceptable too.

Regarding the price Norway is a good place for Pentax bargains .-)

DagT

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Re: curious

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I saw it and quite liked it, nice tonality.

Paul Stenquist wrote:
 I'm somewhat surprised that there was no response to my post of a 
 picture of a woman in what coucl be called an aniti-social environment. 
 It's not unlike an Arbus pic, although not as well executed perhaps.  
 Is the total silence due to the content or the execution? Or perhaps it 
 never made it to the list. No big deal, just curious.
 Paul
 http://www.photo.net/photodb/photo?photo_id=5667450size=md


   


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Re: Fuji X Pro 1 (X100 + interchangeable lenses)

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Brian Walters wrote:

 Well, I dunno.  I'm not a fan of the fad for ever smaller cameras.  My
 K200D is about right.  I've handled a K-r and it's too small.  An APS
 mirrorless camera of any size has an advantage over a DSLR in being able
 to accept virtually any lens (provided appropriate adapters are
 available).  To me, that's the main advantage.  Size isn't an issue.
 Price is.  :-(

Brian, don't mistake me for a Q-size fan, which I'm far from being. For a 
rangefinder-style camera, I'd like a size comparable to the E-P3, or an MX, 
if you prefer. In fact, I'm still waiting for an MX-D (now possible, by 
using the mirrorless technology).
Assuming that one already owns a medium-size APS DSLR system, I don't see 
the point of the X-Pro 1 because it does not give noticeable size/weight 
advantage. Oh, and I can already use all of my lenses on a K-5 ;-)

Dario 


I agree. I was a little excited about the X Pro 1, until I discovered that it 
is almost the same size as K-5. 

DagT

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Re: APS-C crop factor, amount of light and ISOs

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This is why I hate equivalent focal lenghts. :-)

The amount of light reaching the sensor does not depend on the size of the 
sensor, and is simply expressed by the f-stop. The f-stop is simply defined as 
the focal length divided by the size of the opening, so with a 200mm f/4.0 lens 
the opening diamater is 50mm (this is not as evident in wide angles).

On the other hand the amount of light collected by the sensors depends on the 
size of the pixels, which can be seen in differences in ISO. Så if a large and 
a small sensor have the same pixel size each pixel will be able to collect the 
same ampunt of light, but the larger sensor will have room for more pixels. 
Thus we geet differences in respolution and/or sensor noise.

DagT

Hi folks!

A confusing question came to me:

To have FF equivalent focal length of a lens for our APS-C sensors, we have to 
apply a factor of 1.6x: 40mm f/2.8 ltd is a 64mm FF equivalent. For the depth 
of field, this factor is to be applied too: 40mm 2.8 ltd is a 64mm f/4.5 FF 
equivalent.

But, what about the amount of light? As the surface divide by 1.6x1.6 and the 
sensor is placed at the same distance as a FF SLR film, the light reaching the 
sensor is divided by the same amount: 2.56. Are the ISO from FF, APS-C, m4/3, 
PS all the same, or are they equivalent ones to take crop factor into account?

Concerning light, is the 40mm 2.8 ltd, a true f/2.8 opened lens, then?

~Alban.


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Re: Diffraction limits

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Larry Colen wrote:

Although I'm beginning to suspect that as resolution increases, 
diffraction and lens issues will soon render anti-aliasing as 
unneeded.  If we're sampling at twice the diffraction limit, or 
the lenses resolution, do we really need an AA filter?


Probably why the Pentax Q doesn't have an anti-aliasing filter: With
14 megapixels in a sensor that small the lens itself is probably the
AA filter.
 

I agree, and because of this I believe that we still will see an increase in 
the number of pixels on dslrs. You don't have to think about moire if you have 
sufficient spacial oversampling, so you can reduce the processing and 
AA-filters.

People expectig more resolution will be disappointed.

DagT

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Re: January PUG is up

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Thank you Reinhard!



> On 5 Jan 2023, at 12:11, Reinhard Sy  wrote:
> 
> Hello,
> I especially liked the picture Hippo Bridge by Jan van Wijk, especially the 
> implementation on the theme


It does take some creativity sometimes to shoehorn an image into the theme yes 
;-)

Regards, JvW

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Re: Donations to the cause

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> On 8 Jan 2023, at 20:18, Doug Brewer  wrote:
> 
> if you wish to help with keeping the hamsters who power the pdml in fine 
> fettle, you can shoot a few bucks to my email at paypal. I also have a venmo 
> account, (at DFBrewer) if you swing that way.

Done ...

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Re: January PUG is up

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> On 6 Jan 2023, at 21:47, Daniel J. Matyola  wrote:
> 
> Jan van Wijk gets my vote for the most inventive interpretation of the
> theme, and it's a compelling image in its own right.


Thanks Dan ;-)

Regards, JvW

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Re: Several photo galleries and a few videos from my october 2022 safari to Botswana

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Thanks Bob,

> On 11 Dec 2022, at 10:31, Bob Pdml  wrote:
> 
> Looks like a fabulous trip - I’d love to go there. Great photos.
> 

It was a great trip indeed, veru inspiring, great photo opportunities nearly 
every day!

Regards, JvW


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Re: Several photo galleries and a few videos from my october 2022 safari to Botswana

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Thank you Henk,

It was a marvelous trip indeed, exhausting, bet very rewarding! 


> On 11 Dec 2022, at 21:59, Henk Terhell  wrote:
> 
> Your mail showed up in the gmail spam folder, however I just saw Bob's
> response. A great series of photos and videos!
> Very entertaining stuff with a nice choice of background music.
> 
> Henk
> 
> Op vr 9 dec. 2022 om 16:42 schreef :
> 
>> Hi all,,
>> 
>> As some of you may know, I have been on a two week photo-safari to
>> Botswana, the Kalahari desert and Okavango Delta in October 2022.
>> 
>> It was an exhausting but VERY rewarding trip, with over 12000 images and a
>> few hours of video resulting from that.
>> About 98 percent was shot with just the K3 III and the DFA 150-450mm.
>> 
>> I finished an overview webpage today that has a photo-gallery and a short
>> video for each of the five visited areas, as well as a ‘favourites’ gallery
>> that has my current 50 favourite images on display.
>> 
>> 
>> It is located at:
>> 
>>   https://www.dfsee.com/videos/botswana.php
>> 
>> 
>> Enjoy!
>> 
>> Regards, JvW
>> 
>> 
>> =
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>> 
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Re: Happy birthday Ann!

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Wish you a very happy birthday indeed Ann!

> On 10 Dec 2022, at 14:18, Comcast  wrote:
> 
> A very happy birthday to Ann, that most charming lady who has done more than 
> anyone to keep this list alive and lively!
> 
> Paul

Regards, JvW

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Several photo galleries and a few videos from my october 2022 safari to Botswana

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Hi all,,

As some of you may know, I have been on a two week photo-safari to Botswana, 
the Kalahari desert and Okavango Delta in October 2022.

It was an exhausting but VERY rewarding trip, with over 12000 images and a few 
hours of video resulting from that.
About 98 percent was shot with just the K3 III and the DFA 150-450mm.

I finished an overview webpage today that has a photo-gallery and a short video 
for each of the five visited areas, as well as a ‘favourites’ gallery that has 
my current 50 favourite images on display.


It is located at:

   https://www.dfsee.com/videos/botswana.php


Enjoy!

Regards, JvW 


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Re: OT Rabbit hole

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> On 1 Feb 2023, at 15:49, ann sanfedele  wrote:
> 
> Ok I did it again this morning.. and did screen shots of my answers  got 3387 
>  with one 1000 pointer -

Interesting game indeed.

Ran it about ten times usually between 1500 and 3000. High-score of 3264 with 
one 1000-pointer in there.

Usually by about a decade ;-)


Regards, JvW

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Re: PESO: Invaders!

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> On 5 Mar 2023, at 14:12, Alan C  wrote:
> 
> We were graced by the appearance of Guinea Fowl with chicks.


Nice one Alan!

Saw lots of those, sometimes in flocks of hundreds, last year in the Kalahari 
Desert (Deception Valley, Botswana).


> They have a hard time around here with all the feral cats. However we have 
> had 518mm rain in Feb. (a record) so the bush is very dense which gives them 
> better protection. Probably some of the older ones remembered being fed here 
> last year. They are still very skittish so I had to move very slowly to get a 
> few grabs.
> 
> https://www.flickr.com/photos/wisselstroom/52726656337/
> 
> K5 & HD 55-300

Regards, JvW

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Re: GESO (6) - Spring Cemetery stroll

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> On 14 Mar 2023, at 02:50, Rick Womer  wrote:
> 
> I took my camera for a walk on a lovely afternoon a week ago. These
> were my favorites.
> 
> https://rickwomer.smugmug.com/2023/March-2023/Woodland-Cemetery-3-6-23/
> 

Nice and pleasing images Rick!

It sure seems like lovely weather ;-)



Rregards, JvW

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Re: PESO: Portrait

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> On 20 Feb 2023, at 03:12, Bill  wrote:
> 
> One of my planned shoots did go ahead today. My other subject came down with 
> a case of Norovirus, which put a real crimp on his day. Maybe next weekend, 
> we'll see.
> 
> Anyway, this was shot with the X-T5 using north window light in an room 
> almost perfect for available light photography.
> Not my usual style of gig, but the subjects were cooperative and things 
> worked out well.
> 
> https://live.staticflickr.com/65535/52698760067_e581853a1a_o.jpg


Beautiful! 

A real nice portrait ..


Regards, JvW

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Re: Updated February PUG

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Thanks Ann, Henk and Ralf for the nice words, and of course Brian for updating 
the PIUG with my image

> On 11 Feb 2023, at 15:01, ann sanfedele  wrote:
> 
> I agree, Henk  -  just realised I havent commented yet (busy busy busy)  on 
> list  did so elsewhere.
> I love your shot.. I think it is my favorite but Rick 's stands out because 
> it ain't scenic and a great grab.
> The whole gallery is super this month.. but so small for subject matter you 
> would think would produce more responses ..
> 


Regards, JvW

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Re: February PUG is up

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> On 4 Feb 2022, at 11:00, Brian W  wrote:
> 
> G'day all
> 
> Enjoy the new gallery here:
> 
> http://pug.komkon.org/
> 
> (you may need to refresh your browser if you see the previous gallery there).
> 
> Note: The automated submission process usually works well but it's not
> infallible. So, if you made a submission and you don't see it in the gallery,
> let me know.
> 

Hi Brian,


Well, that seems to have happened this time.

I sent in a Lioness with cub, in golden-hour light, on the 21st of January, and 
I’m pretty sure I got a confirmation, but no show …

The same image is in my own gallery, should be visible at:

   https://dfsee.com/gallery/lr/pugnew/content/K3307716_large.html


I may have used my jvw.dfsee email address at gmail to send it, like I did 
without problem for the previous two months too.

Regards, JvW

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Re: February PUG is up

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Thanks Brian,

> On 10 Feb 2023, at 04:32, Brian W  wrote:
> 
> Hi Jan
> 
> I've checked the mail server and there's no sign of any submission received 
> from
> you -  so not sure what happened.
> 
> If you want to send me the usual info about the image, I'm happy to add it.

I have just sent you that info, with the (new 500Kb size) image attached, using 
my jvw.dfsee  gmail address.



>>> Note: The automated submission process usually works well but it's not
>>> infallible. So, if you made a submission and you don't see it in the
>>> gallery, let me know.

>> 
>> Well, that seems to have happened this time.
>> 


I may have a clue why it failed, I noticed the image originally submitted, was 
over 600Kb in size, so may have been rejected because of that …


Regards, JvW

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Re: Updated February PUG

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Thanks Alan,

> On 11 Feb 2023, at 16:42, Alan C  wrote:
> 
> A great image, Jan.  BTW, there are actually two cubs!
> 

Indeed, hard to see, but you’re right two are visible here.

She actually had four, but thay played with other aunts and uncles as well ;-)

Regards, JvW

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Re: PESO - selfie in the 'hood

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> On 18 Jan 2024, at 16:42, ann sanfedele  wrote:
> 
> Between FB and INSTAGRAM and PDML FB and using messenger online occasionally 
> where I see most of you, I've been mostly lurking here. confessing that any
> discussion of new tech of any photo related stuff is of little interest  I 
> hardly ever post here these days.  since I can see your photos (which does 
> interest me) elsewhere.
> I'm not doing much new stuff except editing archives and listing stuff  I'm 
> selling on ebay or on the create photo calendars site)
> 
> So for the few who haven't seen me for a while and only look/lurk here  - 
> this is a new one  taken a couple of days before my 87th birthday in Dec.  a 
> few blocks from
> my apt.  The thing that looks like a photo equip bag is an insulated lunch 
> bag for shopping .  I don't do any photo walks - just slip the tiniest camera 
> I have into my pocket
> when I go out and don't anticipate carrying too much other stuff on my way 
> home.  anyway, I kinda like this one.

Nice one Ann!

And who’s the young lady in the mirror?  ;-)

Regards, Jan van Wijk


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Re: OT - Video editing and Post Production

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Hey Cotty,


> On 18 Feb 2024, at 23:43, Steve Cottrell  wrote:
> 
> Hi Pentaxers
> 
> I know some of you shoot video now and then, perhaps even do a little editing.
> 
> I’ve put together this *little* (ahem) film about the post-production process 
> for newbies that some might find interesting.
> 
> It’s in chapters for interrupted viewing.
> 
> https://www.youtube.com/watch?v=oUG0ZqttMNw 
> 


Nice little tutorial!


I knew most of it, but still learned some new tricks or insights

I may want to step up from my more amateurisch ‘MOVAVI’ NLE to something like 
yours :-)


Great work!


Regards, JvW


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Re: Cotty's Channel

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Thanks Cotty!

> On 2 Jan 2024, at 20:06, Steve Cottrell  wrote:
> 
> Hello Pentaxians
> 
> Apologies if I mentioned this here on the list previously…I don’t think I 
> have, so in for a penny…
> 
> I’ve started a Youtube channel - Pentax content will be, ahem, very thin on 
> the ground - but not impossible as I still have some Pentax lenses that I use 
> for video occasionally, and I will feature them in an upcoming episode.
> 
> Anyway - new YouTube channel started yesterday. If you’re venturing into the 
> realms of video, this could be for you. A mixture of 'director's commentary' 
> versions of sailing features I've made with British sailor and broadcaster 
> Tom Cunliffe, and 'how-to' videos to improve your filmmaking skills. 5 new 
> videos dropped January 1st, and there is a short intro video.
> 
> New videos twice a month - have  <>a look and if it's something you might be 
> interested in, by all means do subscribe.

Just did, I do make the occasional video, and always try to edit them properly 
(using the simple MOVAVI program), and get good sound with it.
Not at your level of expertise, but above average for what you see on Youtube 
or Facebook. (which is quite easy really :-)

Your hints and tips, and equipment rants are highly appeciated!

Regards, JvW


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Re: has anyone tried the new firmware update?

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> On 11 Jan 2024, at 23:56, Henk Terhell  wrote:
> 
> Larry, the new firmware V2.40 for K-1 and K-1 II has been corrected and is 
> out now as 2.41. I guess it should be safe now to update.
> For K-1: https://www.ricoh-imaging.co.jp/english/support/digital/k1.html
> 

I just updated my K1 2.20 FW to 2.41, no problems sofar.

I like the simpler mode-3 astrotracer function (but have not used it yet 
obviously)
Also like that focus-limiting now works for my DA 35mm macro lens :-)

Regards, JvW

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Re: Veso: T-bone and the Kalispell Fair - 1988

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> On 27 Apr 2024, at 02:50, ann sanfedele  wrote:
> 
> All the photos were taken with my trusty Pentax LX - Kodachrome's scanned on 
> Epson flatbed v500
> I made the vid in Windows Movie maker .. dropped in the music from an MP3 . 
> Original guitar music
> by my friend Bob Zaidman  - music recorded  on tape back in the 70's - in a 
> studio setting.   Long story -
> I'll skip  but it ws an impromtu performance by Bob on guitar and Dom Duval 
> (sr.)  on bass .  Duval Sr. died in 2016.
> He had gone from the blues stuff to free style jazz and there are a lot of 
> recordings around of him playing jazz.
> 
> Bob had been sending me MP3's  since we have been back in touch.. i really 
> liked this piece they called "What you will"
> and thought the shots I took back in 1988 and the music paired nicely.   The 
> calf really was named "T-bone"
> 
> https://www.youtube.com/watch?v=PI_LzE-HsJo=18s


Nice one Ann,

Reminds me of the six months I lived in Austin TX in the late eighties ;-)

Regards, JvW


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