Re: Stop buying K-5s...new lens(es) !!

2010-11-12 Thread Margus Männik
I know about Contax, I've even tested it years ago. AX autofocus wasn't 
simply slow, it was a disaster. Still it doesn't mean that in-body AF 
couldn't be done better - especially if we consider that instead of film 
mechanism there's only a sensor to move. After all, weight comparison 
between lens (group) and sensor chip is the cornerstone of in-body SR. 
How many people said it can not be done before Pentax engineers just 
came and did it?


BR, Margus



On 11/11/2010 11:58 PM, Adam Maas wrote:

2010/11/11 Margus Männikmar...@eol.ee:

Want some crazy suggestion? ;)
Future Pentax bodies will have in-body autofocus. It's much faster to move a
light sensor than tons of glass. And you'll have AF with any K-mount lens
(and others that you can mount via adapters) ever produced. Great, isn't it?
Why it still has a focus-ring... hmm, well, it's for a backward
compatibility and manual focus, of course.

BR, Margus

In body AF has been done (Contax AX), it's MUCH faster to move the
glass and far less trouble to keep aligned.

-Adam




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Re: Stop buying K-5s...new lens(es) !!

2010-11-12 Thread Bob Sullivan
Margus,
Given the amount of travel in some of my lenses,
I think the idea is a non-starter.
Digital cameras are too thick now.
This would only make it worse.
Regards, Bob S.

2010/11/12 Margus Männik mar...@eol.ee:
 I know about Contax, I've even tested it years ago. AX autofocus wasn't
 simply slow, it was a disaster. Still it doesn't mean that in-body AF
 couldn't be done better - especially if we consider that instead of film
 mechanism there's only a sensor to move. After all, weight comparison
 between lens (group) and sensor chip is the cornerstone of in-body SR. How
 many people said it can not be done before Pentax engineers just came and
 did it?

 BR, Margus



 On 11/11/2010 11:58 PM, Adam Maas wrote:

 2010/11/11 Margus Männikmar...@eol.ee:

 Want some crazy suggestion? ;)
 Future Pentax bodies will have in-body autofocus. It's much faster to
 move a
 light sensor than tons of glass. And you'll have AF with any K-mount lens
 (and others that you can mount via adapters) ever produced. Great, isn't
 it?
 Why it still has a focus-ring... hmm, well, it's for a backward
 compatibility and manual focus, of course.

 BR, Margus

 In body AF has been done (Contax AX), it's MUCH faster to move the
 glass and far less trouble to keep aligned.

 -Adam



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Re: Stop buying K-5s...new lens(es) !!

2010-11-12 Thread Steven Desjardins
How much throw of the sensor would you need to focus?  a few cm?  I
wonder if you could actually sell fixed focus lenses (hyper-focal
point, infinity, etc.)  and let the sensor.  If you could move the
sensor fast enough, would there be any lens advantage?  A fixed focus
prime could be sealed pretty  tightly.

2010/11/12 Margus Männik mar...@eol.ee:
 I know about Contax, I've even tested it years ago. AX autofocus wasn't
 simply slow, it was a disaster. Still it doesn't mean that in-body AF
 couldn't be done better - especially if we consider that instead of film
 mechanism there's only a sensor to move. After all, weight comparison
 between lens (group) and sensor chip is the cornerstone of in-body SR. How
 many people said it can not be done before Pentax engineers just came and
 did it?

 BR, Margus



 On 11/11/2010 11:58 PM, Adam Maas wrote:

 2010/11/11 Margus Männikmar...@eol.ee:

 Want some crazy suggestion? ;)
 Future Pentax bodies will have in-body autofocus. It's much faster to
 move a
 light sensor than tons of glass. And you'll have AF with any K-mount lens
 (and others that you can mount via adapters) ever produced. Great, isn't
 it?
 Why it still has a focus-ring... hmm, well, it's for a backward
 compatibility and manual focus, of course.

 BR, Margus

 In body AF has been done (Contax AX), it's MUCH faster to move the
 glass and far less trouble to keep aligned.

 -Adam



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Re: Stop buying K-5s...new lens(es) !!

2010-11-12 Thread Matthew Hunt
On Fri, Nov 12, 2010 at 12:06 PM, Steven Desjardins drd1...@gmail.com wrote:

 How much throw of the sensor would you need to focus?  a few cm?

It's the same as adding extension tubes; the answer depends on the
focal length of the lens, and how close you want to focus. If you want
to achieve 1:1 macro capability, you need extension equal to the focal
length (e.g. 9 cm for a 90mm 1:1 macro). If you're thinking about
something like a street photography camera, with wide-to-normal lenses
and no macro applications, it might be doable. As a general SLR
replacement, probably not.

You can use this calculator to get maximum magnification and close
focus distance for any focal length and extension:
http://www.cambridgeincolour.com/tutorials/macro-extension-tubes-closeup.htm
Just set the native magnification to 0 X and specify the amount of
extension and focal length.

 If you could move the sensor fast enough, would there be any lens advantage?

You couldn't do floating-element correction for close focus, so that
would be a downside.

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Re: Stop buying K-5s...new lens(es) !!

2010-11-12 Thread Adam Maas
The issue becomes the fact that film is FAR more forgiving of
alignment errors than digital. Not to mention the fact that the AF
sensor  Refle mirror needs to move with the imaging sensor and that
essentially dictates the shutter has to move too. Add the fact that
wider lenses require far smaller and more accurate movements of the
sensor so it needs to be very precise. And it's a lot easier to toss
around a lens in a helical than a mirror box, especially when the lens
group's AF gearing is design specific.

The AX was just about a best-case implementation of body-based AF. The
biggest issues with the concept were inherent, not implementation.

-Adam

2010/11/12 Margus Männik mar...@eol.ee:
 I know about Contax, I've even tested it years ago. AX autofocus wasn't
 simply slow, it was a disaster. Still it doesn't mean that in-body AF
 couldn't be done better - especially if we consider that instead of film
 mechanism there's only a sensor to move. After all, weight comparison
 between lens (group) and sensor chip is the cornerstone of in-body SR. How
 many people said it can not be done before Pentax engineers just came and
 did it?

 BR, Margus



 On 11/11/2010 11:58 PM, Adam Maas wrote:

 2010/11/11 Margus Männikmar...@eol.ee:

 Want some crazy suggestion? ;)
 Future Pentax bodies will have in-body autofocus. It's much faster to
 move a
 light sensor than tons of glass. And you'll have AF with any K-mount lens
 (and others that you can mount via adapters) ever produced. Great, isn't
 it?
 Why it still has a focus-ring... hmm, well, it's for a backward
 compatibility and manual focus, of course.

 BR, Margus

 In body AF has been done (Contax AX), it's MUCH faster to move the
 glass and far less trouble to keep aligned.

 -Adam



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Re: Stop buying K-5s...new lens(es) !!

2010-11-11 Thread Thibouille
A japanese member of pentaxforums said thr 135-1.8 looked much like
the special versions made for japanese army (50/1.2 at least were made
such according to him).

2010/11/10, Dario Bonazza dario.bona...@virgilio.it:
 Jaume Lahuerta wrote:

 Please, tell me if I am too tedious with this:
 http://k-rumors.com/pentax-lens-group-foto-unveils-new-lenses/

 Not tedious at all. Please keep this stuff coming!
 That's a nice intriguing mix of old  new stuff! I believe that 135 to be an
 old prototype lens, unsure if earlier or later than the standard 135mm f/1.8
 * we know. My wild guess would be a later variation, never put into
 production. The Spotmatic and the Takumar 18mm f/11 are much older than the
 rest. That silver thing behind the 135mm is a 40mm Limited with a new
 old-style front cap (AOCo logo) made on occasion of the new AP celebration
 DSLR (a disguised K10D). Those two unnamed lenses behind the 35mm macro look
 like other lenses with similar concept. One of them could be a 50mm macro,
 while I won't venture into guessing on the other one.

 Dario


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Re: Stop buying K-5s...new lens(es) !!

2010-11-11 Thread Margus Männik

Want some crazy suggestion? ;)
Future Pentax bodies will have in-body autofocus. It's much faster to 
move a light sensor than tons of glass. And you'll have AF with any 
K-mount lens (and others that you can mount via adapters) ever produced. 
Great, isn't it? Why it still has a focus-ring... hmm, well, it's for a 
backward compatibility and manual focus, of course.


BR, Margus


On 11/10/2010 2:45 AM, paul stenquist wrote:

Pretty damn close. I'd guess that the lens in the photo posted by Jaume is a 
PhotoShopped version of the old A* lens. Can't see why Pentax would bo back to 
an A* designation. It doesn't appear to be a contemporary lens in any way.
Paul
On Nov 9, 2010, at 7:10 PM, Phil Northeast wrote:


On 10/11/10 10:53 AM, paul stenquist wrote:

Hmmm. It's marked Pentax A*. Doesn't sound like a new lens. But I'd like a 
135/1.8. Great lens for shooting performs in clubs.
Paul

Oh, and keep the rumors coming. They're not the least bit tedious.


On Nov 9, 2010, at 6:32 PM, Jaume Lahuerta wrote:


Please, tell me if I am too tedious with this:
http://k-rumors.com/pentax-lens-group-foto-unveils-new-lenses/





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Here is details of an older version

http://kmp.bdimitrov.de/lenses/primes/tele/A135f1.8.html

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Re: Stop buying K-5s...new lens(es) !!

2010-11-11 Thread Adam Maas
2010/11/11 Margus Männik mar...@eol.ee:
 Want some crazy suggestion? ;)
 Future Pentax bodies will have in-body autofocus. It's much faster to move a
 light sensor than tons of glass. And you'll have AF with any K-mount lens
 (and others that you can mount via adapters) ever produced. Great, isn't it?
 Why it still has a focus-ring... hmm, well, it's for a backward
 compatibility and manual focus, of course.

 BR, Margus

In body AF has been done (Contax AX), it's MUCH faster to move the
glass and far less trouble to keep aligned.

-Adam

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Re: Stop buying K-5s...new lens(es) !!

2010-11-11 Thread P. J. Alling
I think Contax tried that.  Pentax is here Contax is gone.  Casualty 
isn't guaranteed but it's the way to bet.


On 11/11/2010 4:28 PM, Margus Männik wrote:

Want some crazy suggestion? ;)
Future Pentax bodies will have in-body autofocus. It's much faster to 
move a light sensor than tons of glass. And you'll have AF with any 
K-mount lens (and others that you can mount via adapters) ever 
produced. Great, isn't it? Why it still has a focus-ring... hmm, well, 
it's for a backward compatibility and manual focus, of course.


BR, Margus


On 11/10/2010 2:45 AM, paul stenquist wrote:
Pretty damn close. I'd guess that the lens in the photo posted by 
Jaume is a PhotoShopped version of the old A* lens. Can't see why 
Pentax would bo back to an A* designation. It doesn't appear to be a 
contemporary lens in any way.

Paul
On Nov 9, 2010, at 7:10 PM, Phil Northeast wrote:


On 10/11/10 10:53 AM, paul stenquist wrote:
Hmmm. It's marked Pentax A*. Doesn't sound like a new lens. But I'd 
like a 135/1.8. Great lens for shooting performs in clubs.

Paul

Oh, and keep the rumors coming. They're not the least bit tedious.


On Nov 9, 2010, at 6:32 PM, Jaume Lahuerta wrote:


Please, tell me if I am too tedious with this:
http://k-rumors.com/pentax-lens-group-foto-unveils-new-lenses/





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Here is details of an older version

http://kmp.bdimitrov.de/lenses/primes/tele/A135f1.8.html

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Re: Stop buying K-5s...new lens(es) !!

2010-11-10 Thread Dario Bonazza

Jaume Lahuerta wrote:


Please, tell me if I am too tedious with this:
http://k-rumors.com/pentax-lens-group-foto-unveils-new-lenses/


Not tedious at all. Please keep this stuff coming!
That's a nice intriguing mix of old  new stuff! I believe that 135 to be an 
old prototype lens, unsure if earlier or later than the standard 135mm f/1.8 
* we know. My wild guess would be a later variation, never put into 
production. The Spotmatic and the Takumar 18mm f/11 are much older than the 
rest. That silver thing behind the 135mm is a 40mm Limited with a new 
old-style front cap (AOCo logo) made on occasion of the new AP celebration 
DSLR (a disguised K10D). Those two unnamed lenses behind the 35mm macro look 
like other lenses with similar concept. One of them could be a 50mm macro, 
while I won't venture into guessing on the other one.


Dario 



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Re: Stop buying K-5s...new lens(es) !!

2010-11-10 Thread John Sessoms

From: Steve Sharpe


At 3:32 PM -0800 11/9/10, Jaume Lahuerta wrote:

Please, tell me if I am too tedious with this:
http://k-rumors.com/pentax-lens-group-foto-unveils-new-lenses/


Strange that it has an aperture ring.



Looks a whole lot like the one on B Dimitrov's site to me.

Only differences I see are cosmetic ... the gray color of the coating, 
that green ring and the grip surface on the focus ring.


All of those could have been done to an existing lens. It would be nice, 
but I just don't see it.


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RE: Stop buying K-5s...new lens(es) !!

2010-11-10 Thread John Sessoms

From: John Celio


What an amusingly strange collection of lenses!  The 135 is certainly
intriguing, since it looks pretty different from the original version.
I wonder if it's some sort of special/limited release?

Those two odd lenses behind the 35 macro must either be something new,
in prototype form, or somehow related to the 35 macro.  One appears to
have a sticker on it with some Japanese characters.  They look like they
have the same front end except for the extra grip rings around the
front, and the same bottom below the grip rings too.  Intriguing!

It's funny to see a Fish-Eye Takumar pancake lens on the far left.  I
had one for a while and finally sold it last year.  Except for that one
lens, I am jealous of this set. ;)


I can't identify many of them, but the one immediately to the right of 
the 135f1.8 looks like a Pentax 67 lens, and I found a Pentax 67 100mmf4 
Macro lens that it might be.


That would be consistent with the 67 to K mount adapter on the table 
right in front of the 135f1.8


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Re: Stop buying K-5s...new lens(es) !!

2010-11-10 Thread Adam Maas
On Wed, Nov 10, 2010 at 9:24 PM, John Sessoms jsessoms...@nc.rr.com wrote:

 I can't identify many of them, but the one immediately to the right of the
 135f1.8 looks like a Pentax 67 lens, and I found a Pentax 67 100mmf4 Macro
 lens that it might be.

 That would be consistent with the 67 to K mount adapter on the table right
 in front of the 135f1.8



It's definitely the Pentax-67 100/4 Macro. The mount is clearly a 67
mount (by diameter and the A/M switch).

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Re: Stop buying K-5s...new lens(es) !!

2010-11-09 Thread paul stenquist
Hmmm. It's marked Pentax A*. Doesn't sound like a new lens. But I'd like a 
135/1.8. Great lens for shooting performs in clubs.
Paul

Oh, and keep the rumors coming. They're not the least bit tedious.


On Nov 9, 2010, at 6:32 PM, Jaume Lahuerta wrote:

 Please, tell me if I am too tedious with this:
 http://k-rumors.com/pentax-lens-group-foto-unveils-new-lenses/
 
 
 
 
 
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Re: Stop buying K-5s...new lens(es) !!

2010-11-09 Thread Steve Sharpe

At 3:32 PM -0800 11/9/10, Jaume Lahuerta wrote:

Please, tell me if I am too tedious with this:
http://k-rumors.com/pentax-lens-group-foto-unveils-new-lenses/



Strange that it has an aperture ring.

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Re: Stop buying K-5s...new lens(es) !!

2010-11-09 Thread Phil Northeast

On 10/11/10 10:53 AM, paul stenquist wrote:

Hmmm. It's marked Pentax A*. Doesn't sound like a new lens. But I'd like a 
135/1.8. Great lens for shooting performs in clubs.
Paul

Oh, and keep the rumors coming. They're not the least bit tedious.


On Nov 9, 2010, at 6:32 PM, Jaume Lahuerta wrote:


Please, tell me if I am too tedious with this:
http://k-rumors.com/pentax-lens-group-foto-unveils-new-lenses/





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Here is details of an older version

http://kmp.bdimitrov.de/lenses/primes/tele/A135f1.8.html

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Re: Stop buying K-5s...new lens(es) !!

2010-11-09 Thread paul stenquist
Pretty damn close. I'd guess that the lens in the photo posted by Jaume is a 
PhotoShopped version of the old A* lens. Can't see why Pentax would bo back to 
an A* designation. It doesn't appear to be a contemporary lens in any way.
Paul
On Nov 9, 2010, at 7:10 PM, Phil Northeast wrote:

 On 10/11/10 10:53 AM, paul stenquist wrote:
 Hmmm. It's marked Pentax A*. Doesn't sound like a new lens. But I'd like a 
 135/1.8. Great lens for shooting performs in clubs.
 Paul
 
 Oh, and keep the rumors coming. They're not the least bit tedious.
 
 
 On Nov 9, 2010, at 6:32 PM, Jaume Lahuerta wrote:
 
 Please, tell me if I am too tedious with this:
 http://k-rumors.com/pentax-lens-group-foto-unveils-new-lenses/
 
 
 
 
 
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 follow the directions.
 
 Here is details of an older version
 
 http://kmp.bdimitrov.de/lenses/primes/tele/A135f1.8.html
 
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RE: Stop buying K-5s...new lens(es) !!

2010-11-09 Thread John Celio
What an amusingly strange collection of lenses!  The 135 is certainly
intriguing, since it looks pretty different from the original version. 
I wonder if it's some sort of special/limited release?

Those two odd lenses behind the 35 macro must either be something new,
in prototype form, or somehow related to the 35 macro.  One appears to
have a sticker on it with some Japanese characters.  They look like they
have the same front end except for the extra grip rings around the
front, and the same bottom below the grip rings too.  Intriguing!

It's funny to see a Fish-Eye Takumar pancake lens on the far left.  I
had one for a while and finally sold it last year.  Except for that one
lens, I am jealous of this set. ;)

John

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 Original Message 
Subject: Stop buying K-5s...new lens(es) !!
From: Jaume Lahuerta jlah...@yahoo.com
Date: Tue, November 09, 2010 4:32 pm
To: pdml@pdml.net

Please, tell me if I am too tedious with this:
http://k-rumors.com/pentax-lens-group-foto-unveils-new-lenses/



 

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Re: Stop buying K-5s...new lens(es) !!

2010-11-09 Thread Adam Maas
Even more likely is it's an old protorype of the A* 135 given that the
finish resembles the old A* super-tele's.

-Adam

On Tue, Nov 9, 2010 at 7:45 PM, paul stenquist pnstenqu...@comcast.net wrote:
 Pretty damn close. I'd guess that the lens in the photo posted by Jaume is a 
 PhotoShopped version of the old A* lens. Can't see why Pentax would bo back 
 to an A* designation. It doesn't appear to be a contemporary lens in any way.
 Paul
 On Nov 9, 2010, at 7:10 PM, Phil Northeast wrote:

 On 10/11/10 10:53 AM, paul stenquist wrote:
 Hmmm. It's marked Pentax A*. Doesn't sound like a new lens. But I'd like a 
 135/1.8. Great lens for shooting performs in clubs.
 Paul

 Oh, and keep the rumors coming. They're not the least bit tedious.


 On Nov 9, 2010, at 6:32 PM, Jaume Lahuerta wrote:

 Please, tell me if I am too tedious with this:
 http://k-rumors.com/pentax-lens-group-foto-unveils-new-lenses/





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 Here is details of an older version

 http://kmp.bdimitrov.de/lenses/primes/tele/A135f1.8.html

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-- 
M. Adam Maas
http://www.mawz.ca
Explorations of the City Around Us.

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Re: Stop buying K-5s...new lens(es) !!

2010-11-09 Thread Boris Liberman

On 11/10/2010 1:32 AM, Jaume Lahuerta wrote:

Please, tell me if I am too tedious with this:
http://k-rumors.com/pentax-lens-group-foto-unveils-new-lenses/


I have enough lenses, thank you so much, sir. And then I have some more 
lenses...


Boris


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