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02-02-2012, 08:43 AM   #1
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Lens design for K-01

I know that K-01 has the same flange focal distance (k-mount). However, since it doesn't has the mirror inside the camera. Can pentax make use of the space and make the future lens much smaller (as if part of the lens tube sit inside the camera)?

02-02-2012, 08:54 AM   #2
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Absolutely.
02-02-2012, 10:50 AM   #3
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Its a bit disappointing that they can't work on the standard SLR. The 40XS design is also apparently a fixed focus lens, please correct me if I am misunderstanding some of what I have read on this, which might be great for the video aspect but presents other limitations.

Pentax 40mm F/2.8 Interchangeable Lens


  • Ultra low profile is only 0.36 inches thin at 1.8 oz.
  • Fixed focal length 40mm prime lens is equivalent to 61mm in the 35mm format.
  • Short 16 inch minimum focus distance.
  • Maximum F2.8 aperture is ideal for existing light photography and creative depth of field applications.
  • Nine rounded aperture blades produce extraordinarily smooth, natural bokeh.
  • Pentax SP (Super Protect) coating on lens surface helps repel elements and aids in cleaning.
  • Pentax KAF mount is compatible with current and past K-mount compatible cameras.
The new smc Pentax-DA 40mm F2.8 XS interchangeable lens is the world's thinnest interchangeable lens.* The new 40mm combines with the Pentax K-01 camera body to deliver a unique compact system camera that is perfect for photographers who are as keen on design as they are on performance. Together, the K-01 and this 40mm lens system mark the intersection where high technology and high design meet.
02-02-2012, 10:52 AM   #4
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QuoteOriginally posted by yipchunyu Quote
I know that K-01 has the same flange focal distance (k-mount). However, since it doesn't has the mirror inside the camera. Can pentax make use of the space and make the future lens much smaller (as if part of the lens tube sit inside the camera)?
But then those won't work on convential Pentax DSLR's...

02-02-2012, 10:53 AM   #5
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QuoteOriginally posted by ducdao Quote
But then those won't work on convential Pentax DSLR's...
I heard that the DA 40mm F2.8 XS also work on K01 only. Is it true?
02-02-2012, 11:00 AM   #6
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QuoteOriginally posted by Docrwm Quote
Its a bit disappointing that they can't work on the standard SLR. The 40XS design is also apparently a fixed focus lens, please correct me if I am misunderstanding some of what I have read on this, which might be great for the video aspect but presents other limitations.
If it's fixed focus, why does it have a focusing ring?

It's just a DA 40 Limited without quick-shift. By eliminating the distance marker they could make it thinner.
02-02-2012, 11:02 AM   #7
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QuoteOriginally posted by yipchunyu Quote
I heard that the DA 40mm F2.8 XS also work on K01 only. Is it true?
"Was designed exclusively for the K-01", but Pentaximaging.com says "PENTAX KAF mount is compatible with current and past K-mount compatible cameras."

PENTAX - smc PENTAX-DA 40mm F2.8 XS Lens
02-02-2012, 11:22 AM   #8
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I am pretty sure that it works on any Pentax camera.
What difference should there be?

02-02-2012, 11:25 AM   #9
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QuoteOriginally posted by blende8 Quote
I am pretty sure that it works on any Pentax camera.
What difference should there be?
I think something was lost in the translation. The press release says it was designed exclusively for the K-01. Some have interpreted that as "only works with". The product page at Pentaximaging.com says otherwise.
02-02-2012, 11:46 AM   #10
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QuoteOriginally posted by blende8 Quote
I am pretty sure that it works on any Pentax camera.
What difference should there be?
To my understanding the lense has been designed to extend further back into the camera body, projecting into the space where the mirror moves in the SLR's. Meaning the mirror will hit the back of the lense if used on an SLR, similar in design to the Fuji XF mount and the Contax Biogon lenses.

T
02-02-2012, 11:58 AM   #11
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QuoteOriginally posted by blende8 Quote
I am pretty sure that it works on any Pentax camera.
What difference should there be?
Too much of the lens projects into the camera past the mount. The comments all seem to indicate that it will not work on other K-mount cameras. I've also read someplace that its a fixed focus lens, which may have been a language issue as its a fixed focal length lens for sure, but the ridges on the lens may simply be there for grip to insert it into the body and turn it to finish installing it. More information is definitely needed on this lens. Even Pentax Japan does not have much at all,.
02-02-2012, 12:02 PM   #12
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QuoteOriginally posted by Docrwm Quote
Too much of the lens projects into the camera past the mount
I don't think it extends into the camera more then normal, my guess is that that rumor was an internet invention.
02-02-2012, 12:44 PM   #13
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QuoteOriginally posted by Gimbal Quote
I don't think it extends into the camera more then normal, my guess is that that rumor was an internet invention.
It clearly appears to extend more than normal into the body.

Last edited by Docrwm; 05-06-2013 at 08:11 PM.
02-02-2012, 12:56 PM   #14
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QuoteOriginally posted by Docrwm Quote
It clearly appears to extend more than normal into the body.
I doesn't look to extend much more than DA40 Limited.
Hin's Tech Corner: Pentax DA Limited and Pentax K-x White

I doubt that there are much done to change optical design between DA40 Limited and DA40 XS.
02-02-2012, 01:00 PM   #15
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QuoteOriginally posted by Docrwm Quote
Its a bit disappointing that they can't work on the standard SLR. The 40XS design is also apparently a fixed focus lens, please correct me if I am misunderstanding some of what I have read on this, which might be great for the video aspect but presents other limitations.

Pentax 40mm F/2.8 Interchangeable Lens


  • Ultra low profile is only 0.36 inches thin at 1.8 oz.
  • Fixed focal length 40mm prime lens is equivalent to 61mm in the 35mm format.
  • Short 16 inch minimum focus distance.
  • Maximum F2.8 aperture is ideal for existing light photography and creative depth of field applications.
  • Nine rounded aperture blades produce extraordinarily smooth, natural bokeh.
  • Pentax SP (Super Protect) coating on lens surface helps repel elements and aids in cleaning.
  • Pentax KAF mount is compatible with current and past K-mount compatible cameras.
The new smc Pentax-DA 40mm F2.8 XS interchangeable lens is the world's thinnest interchangeable lens.* The new 40mm combines with the Pentax K-01 camera body to deliver a unique compact system camera that is perfect for photographers who are as keen on design as they are on performance. Together, the K-01 and this 40mm lens system mark the intersection where high technology and high design meet.
Fixed Focal length not fixed Focus. Just fancy words for prime lens a term many P&S users may not know where they can decipher Fixed Focal Length
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