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06-08-2012, 11:22 AM   #1
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new lens patent of pentax

Pentax 18-55mm F3.5-6.7 APS-C??????????????????????So-net???

Can't read much Japanese. Neither the creepy google English. Does it mean that the rare element can be moved to the sensor as close as 3mm?! What does "back focus 3mm" mean?
And if I understand it correctly, when zoom out, only 1.5cm of the lens will be outside the camera. :cool


Last edited by feishui; 06-08-2012 at 11:46 AM.
06-08-2012, 11:30 AM   #2
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/****************
QuoteQuote:
Pentax is 18-55mm F3.5-6.7 of the patent is pending. Is a standard zoom lens 28-80mm 35mm equivalent corresponding to the APS-C format. Less so for the mirror lens, I might have to be provided as a kit lens of the next K-01 series.
***************/

So, a kit lens for the K01 (or as noted the next in the K01 series)...
06-08-2012, 11:36 AM   #3
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"That's why I think that will work for those who dance meat of blood welling."

Sounds cool.
06-08-2012, 11:40 AM   #4
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QuoteQuote:
Compact and lightweight PENTAX

So when a wide-angle lens length of 59.72mm, will be calculated when the lens is not attached K-01 is flying out only 1.5cm from the body. Although its mechanism of our various K-01 fits in your body, sounds like a pancake lens.

There and Back Focus 3.00mm, this is because it contains and OLPF IRCF, is actually slightly longer. Does not protrude from the body because the lens is only 4cm whether actually installed as a separate, even though attached to the NEX, as APS-C size mirror less the balance is pretty good so. As expected only say that we have developed a camera Pentax camera world's smallest, lightest of the world is.

Patent, so there is a time lag of six months and one year to the public from the applicant, at that time had been working on the design lens, which might have been assumed to machine the mirror-less, such as NEX instead of K-01. However, for K-01 Assuming that if a variety of mechanical mechanism is not designed to fit the inside diameter of the K bayonet mount from will not, will haunt considerable difficulty. That's why engineers think will work for those who dance meat of blood welling.
Pentax 18-55mm F3.5-6.7 APS-C??????????????????????So-net???

06-08-2012, 11:45 AM   #5
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Looks like a 3 stages zoom...In my widest guess would it be something like the Panasonic-X M4/3 zoom? It has electronic zoom button, and collapsible into a "pancake" size when un-zoomed??
06-08-2012, 11:50 AM   #6
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QuoteOriginally posted by tcbubbleleo Quote
Looks like a 3 stages zoom...In my widest guess would it be something like the Panasonic-X M4/3 zoom? It has electronic zoom button, and collapsible into a "pancake" size when un-zoomed??
No. It's normal zoom.

8 lens elements in 7 groups
1 ED glass element,
three aspherical lenses
06-08-2012, 11:54 AM   #7
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Not so fast, that is not so good. As long as it is cheap.
06-08-2012, 11:57 AM   #8
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QuoteOriginally posted by RonHendriks1966 Quote
Not so fast, that is not so good. As long as it is cheap.
But small.

06-08-2012, 12:01 PM   #9
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QuoteOriginally posted by ogl Quote
But small.
yes, but with f6.7 AF on K-01 won't be fast anymore. To my experience the AF is faster and more accurate (under low light) with fast lenses (FA31mm, DA*55mm and FA*85mm).
06-08-2012, 01:17 PM   #10
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Trade-offs exist. Fast zooms aren't small. Small zooms aren't fast. Big zooms probably aren't as agile (fast AF) as small zooms. Wee tiny zooms -- and a DA 18-55/3.5-6.7 XS will probably the smallest Pentax AFZ ever -- certainly seem well-fitted to wee tiny cameras.

Does slow aperture affect agility? I'm not sure. On my K20D, I just rough-tested my F35-70/3.5-4.5 @70mm with a 2-stop filter mounted for an effective aperture of f/9, and it seems just as agile with or without. And without a filter, the F35-70 seems no less agile than my FA50/1.4. Will a DA 18-55/3.5-6.7 XS be as agile as a Limited? Probably not. Will it be agile enough for users wanting a pocketable package? Maybe.

Slow lenses have their place in the food chain. Well, they used to, anyway. I have various 35-40-75-100mm f/4.5 lenses. In their native 135/FF habitats, they would be roughly AOV+DOF-equivalent to 24-28-50-65mm f/2.8 on APS-C -- not totally unreasonable products.

Last edited by RioRico; 06-08-2012 at 01:28 PM.
06-08-2012, 01:26 PM   #11
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Sounds like a proof of concept or something.

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06-08-2012, 01:51 PM   #12
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This would be very cool and a nice justification of the "big" K-01 box if all of the lens travel was inside the camera housing!
06-08-2012, 02:54 PM   #13
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20% barrel distortion at 18mm?
06-08-2012, 03:27 PM   #14
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QuoteOriginally posted by Mistral75 Quote
20% barrel distortion at 18mm?
No kidding. I noticed that as well. That kind of blows. But otherwise the numbers look generally speaking pretty good I say.

The author of the page was thinking that when this design was underway, Pentax probably had different kind of mirrorless concept in the works, as based on this design it will be difficult to fit all the protruding components within the K-01 body . . . .
06-08-2012, 05:55 PM   #15
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QuoteOriginally posted by Mistral75 Quote
20% barrel distortion at 18mm?
Some m43 lenses have severe barrel distortion corrected through proprietary software in-camera.

It's proprietary so you cannot test for it
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