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02-12-2012, 01:33 PM   #16
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These are speed holes, they make the lens go faster.

02-12-2012, 01:34 PM   #17
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Perhaps this is a modification of the K mount similar to the Canon EF-S mount?

N.B. The Canon EF-S mount is an extension of the EF mount which is exclusive to APS-C lenses and bodies. An EF-S body can take both EF and EF-S lenses, but an EF body cannot accept EF-S lenses. EF-S lenses often have protruding rear elements that will collide with a full-frame mirror.

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02-12-2012, 02:18 PM   #18
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may be just the material used for prototyping

The prototype may not be machined to the same level as the final product would be and it could even be a different material.

QuoteOriginally posted by Asahiflex Quote
It's certainly aluminium:


02-12-2012, 02:47 PM   #19
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QuoteOriginally posted by ogl Quote
What is it? It's only one photo where we can see it.
An important clue is that this is the smallest lens ever (at least for the K-mount). This means less space for certain mechanisms such as the diaphragm actuation. IMHO the opening provides just that: more space for the lens mechanism.

02-12-2012, 07:55 PM   #20
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QuoteOriginally posted by Painter Quote
The prototype may not be machined to the same level as the final product would be and it could even be a different material.
This might be the reason, 'cause most if not all 40XS photos are from prototypes but not the actual final production copies.
02-13-2012, 02:31 AM   #21
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The small size might also be a challenge in assembly. The hole might play a role in connecting the actuator arm with the aperture mechanism.
02-13-2012, 08:37 AM - 2 Likes   #22
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It could be the ogl hole. Pentax engineers devised the ogl hole to keep him busy for a while.
02-13-2012, 08:42 AM   #23
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QuoteOriginally posted by Blue Quote
It could be the ogl hole. Pentax engineers devised the ogl hole to keep him busy for a while.
LOgL!

02-13-2012, 08:47 AM   #24
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QuoteOriginally posted by blue Quote
it could be the ogl hole. Pentax engineers devised the ogl hole to keep him busy for a while.
02-13-2012, 08:53 AM   #25
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QuoteOriginally posted by Blue Quote
It could be the ogl hole. Pentax engineers devised the ogl hole to keep him busy for a while.
My hole is in other place...
02-13-2012, 07:02 PM   #26
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QuoteOriginally posted by rvannatta Quote
If they make a lens that protrudes so far that you smash the mirror just trying to install it, then we will probably have a lot of broken mirrors.
Unlucky to say the least and would probably reflect badly on Pentax.
02-13-2012, 07:10 PM   #27
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QuoteOriginally posted by bogiesbad Quote
Unlucky to say the least and would probably reflect badly on Pentax.
Is that a pun ?
02-13-2012, 07:15 PM   #28
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QuoteOriginally posted by JinDesu Quote
Is that a pun ?
Just one way to state the obvious.
02-14-2012, 06:54 AM   #29
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QuoteOriginally posted by aleonx3 Quote
Me too, don't see anything strange about it, there is always hole around the aperture level.

By the way, does the 40mm XS lens mounts properly on the k-5? I like to give it a try if it is priced similarly to the DA 40.
How about a Limited Edition Silver K5 with silver DA40XS?

02-14-2012, 09:06 AM   #30
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QuoteOriginally posted by felixkh Quote
How about a Limited Edition Silver K5 with silver DA40XS?
That image looks stimulated.
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