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View Poll Results: Should PENTAX make a f/1.0 or faster lens?
Yes 5340.15%
No 7959.85%
Voters: 132. You may not vote on this poll

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06-02-2011, 11:28 AM   #1
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Should PENTAX make a super-high-speed lens?

Should PENTAX make a prime lens of f/1.0 or faster? It doesn't have to cover full frame. Perhaps a lens like "smc PENTAX-DA* 50mm f/0.9 ED AL [IF] SDM"? What is your opinion? Such a lens may be very expensive, and most of the super-high-speed lenses I have seen are for mounts with short back focus distances, such as rangefinders and mirrorless cameras, so such a lens would be very difficult to design for an SLR lens mount. Additionally, the depth of field would be extremely shallow wide open. It's not impossible, however, and if such a lens is built, it could be the standout lens for the K mount.

On a side note, the fastest aperture lens the KA mount contacts appear to allow is about f/0.85; see this Bojidar Dimitrov article.


Last edited by bwDraco; 06-02-2011 at 11:36 AM.
06-02-2011, 11:39 AM   #2
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NO. f1.2 is more than enough. Pentax just needs to make it AF and everyone would be a happy camper. besides, the Pentax manual f1.2's are cheaper compared to what other systems and other brands are offering. Pentax lenses are usually sold from $250-$600 used on average, while others systems offer from $900 to way over a thousand.
an AF version of the old Pentax would probably cost at around $1,200-$1,500.
06-02-2011, 11:40 AM   #3
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On a further note, Canon once made an f/1.0 lens for the EF mount, but it proved to be very soft at all aperture settings. I feel that with modern lens technologies, it would be possible to make a usable super-fast lens, though it would still be very difficult and expensive to do so.
06-02-2011, 11:42 AM   #4
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probably impractical lens to do due to very shallow DOF

06-02-2011, 11:45 AM - 3 Likes   #5
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For the millionth time, shallow DOF is not impractical when you are focusing at further distances, especially since we're on a crop sensor. It can create a very nice effect, though often it is more practical money and sharpness wise to use the brenizer method aka 'bokeh panorama'

Here is some work from photographers that utilize this method:

Ryan Brenizer

Sean Molin

Last edited by Eruditass; 06-02-2011 at 12:43 PM.
06-02-2011, 11:52 AM   #6
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Eruditass !!!!!!!!!!!!!!!!!!!!!!!

WOW

YOU ARE A F<><><><ING GENIUS!!!!!!

this is THE BEST photos I have EVER seen

you INSPIRE me - wanna be YOU!!!!

)))) ))) ))) WELL DONE

THANK YOU FOR SHARING KEEEP UP THE GOOD WORK!!!
06-02-2011, 11:56 AM   #7
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yess..some kind noctilux 50 /0,9.. :top:
06-02-2011, 12:02 PM   #8
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I was once told that faster then 1.0 would be impossible. Because 1.0 would imply that no light is lost whilst passing through the lens. In other words: 0.9 would indicate that the lens adds 10% more light to the received light

Was I misinformed?

06-02-2011, 12:06 PM   #9
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Yes, since there are even f/0.7 lenses avaible.
Barry Lyndon - Wikipedia, the free encyclopedia
06-02-2011, 12:07 PM   #10
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QuoteOriginally posted by Clavius Quote
I was once told that faster then 1.0 would be impossible. Because 1.0 would imply that no light is lost whilst passing through the lens. In other words: 0.9 would indicate that the lens adds 10% more light to the received light

Was I misinformed?
Yes. The f-number is the ratio of the focal length to the size of the entrance pupil (the minimum diameter of the front lens element). A 50mm f/0.9 lens needs a front lens element of at least 55.56 mm diameter. The fastest lens ever made was a Carl Zeiss f/0.7 lens originally intended for NASA; these lenses were later modified for cine use.
06-02-2011, 12:07 PM   #11
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QuoteOriginally posted by Clavius Quote
I was once told that faster then 1.0 would be impossible. Because 1.0 would imply that no light is lost whilst passing through the lens. In other words: 0.9 would indicate that the lens adds 10% more light to the received light

Was I misinformed?
Yes, exactly. Google what is "light collector"
06-02-2011, 12:20 PM   #12
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Thanks! I learned again...

...But in that case, I'm voting 'yes'.

Last edited by Clavius; 06-02-2011 at 12:48 PM.
06-02-2011, 12:28 PM   #13
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@Eruditass
Love your shots. Those are beautiful photos demonstrating amazing use of DOF at larger distances.

I love shooting wide open for street photography. So the faster the better!
06-02-2011, 12:31 PM   #14
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QuoteOriginally posted by dreamfoto Quote
Eruditass !!!!!!!!!!!!!!!!!!!!!!!

WOW

YOU ARE A F<><><><ING GENIUS!!!!!!

this is THE BEST photos I have EVER seen

you INSPIRE me - wanna be YOU!!!!

)))) ))) ))) WELL DONE

THANK YOU FOR SHARING KEEEP UP THE GOOD WORK!!!
QuoteOriginally posted by sweetpapa Quote
@Eruditass
Love your shots. Those are beautiful photos demonstrating amazing use of DOF at larger distances.

I love shooting wide open for street photography. So the faster the better!
These aren't mine, I've updated my post to reflect the authors (which can be seen on the watermark).
06-02-2011, 01:33 PM   #15
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I think it is a wast of R&D resources.
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