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06-04-2013, 09:32 AM   #1
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Why only one fast Q lens from Pentax?

I'm just wondering... what would keep Pentax from making all of the lenses for the Q fast? The 06 is f2.8 & the 02 is 2.8 to 4.5. Other C-mount lenses are routinely f1.2 or 1.4. Even the $25 Fujian 35mm is f1.7.

Lots of C-mount zooms are around f1.4... even the long tele zooms.

There shouldn't be anything holding Pentax back from making all of the Q lenses in the f1.4 to f1.7 range, without significantly raising the price.

06-04-2013, 10:03 AM   #2
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I think its mostly size and cost? Probably because its a "new" system and Pentax didn't know if it would catch on, so they were conservative with lenses. Though, you are right, some more higher quality Pentax lenses for the Q would be very make the system more attractive.
06-04-2013, 10:03 AM   #3
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QuoteOriginally posted by GibbyTheMole Quote
There shouldn't be anything holding Pentax back from making all of the Q lenses in the f1.4 to f1.7 range, without significantly raising the price.
Image quality vs. development time. I've had a few of those "super fast C-mounts" and while the massive distortion in these existing designs can be corrected, the awful softness at anything under f/2 cannot. I think the 01 is a marvel of optical engineering, and the 02 and 06 are mainly there to "fill the focal length gaps." A nice 4mm at f/2 would be nice, as well as an 18mm f/1.2 if they could swing it (for portraits).
06-04-2013, 10:05 AM   #4
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I agree with you, Gibby. The small sensor gives them a lot of options. Most of those lenses aren't up to the quality of the Q glass though, and they aren't AF. I think Pentax wants to keep Q glass small and sharp (unless noted as a toy lens). Maybe they can't make the lenses cheap, fast, small, with a leaf shutter and an ND filter. Something has to give?

I bought an Auto 110 18mm for portraits, it is tiny, but it is 2.8.

06-04-2013, 10:18 AM   #5
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QuoteOriginally posted by kenafein Quote
Maybe they can't make the lenses cheap, fast, small, with a leaf shutter and an ND filter. Something has to give?
as often noted, a lens is always a compromise between : fast, small, cheap. pick two

I've seen lots of patent for lens made for 1/1.7 sensor during the last semester, like this one either a 21-85/ 1.8-2.8 or 24-100/1.8-2.8 *

Ricoh 4.6-18mm F1.8-2.8 (1/1.7")?????????????So-net???
06-04-2013, 10:44 AM   #6
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Mostly what Pentax should have already marketed .. a fast wide angle. Everybody's been waiting on that!! !

For tele, I was tempted by the 06, but then realized I hardly ever use the zoom (in-between) focal lengths - and the A-110 18 + 50 + 70mm lenses fill that in nicely all at (and only) 2.8

Apparently Fuji will market an entry-level mirrorless 1/2.3 based system this year. I wonder at some more possibilities ..
06-04-2013, 10:48 AM   #7
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QuoteOriginally posted by aurele Quote
as often noted, a lens is always a compromise between : fast, small, cheap. pick two

I've seen lots of patent for lens made for 1/1.7 sensor during the last semester, like this one either a 21-85/ 1.8-2.8 or 24-100/1.8-2.8 *

Ricoh 4.6-18mm F1.8-2.8 (1/1.7")?????????????So-net???
To be fair, I don't consider any but the toy lenses cheap, but maybe they are when you consider all the features.
06-04-2013, 11:19 AM   #8
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QuoteOriginally posted by GibbyTheMole Quote
I'm just wondering... what would keep Pentax from making all of the lenses for the Q fast? The 06 is f2.8 & the 02 is 2.8 to 4.5. Other C-mount lenses are routinely f1.2 or 1.4. Even the $25 Fujian 35mm is f1.7.

Lots of C-mount zooms are around f1.4... even the long tele zooms.

There shouldn't be anything holding Pentax back from making all of the Q lenses in the f1.4 to f1.7 range, without significantly raising the price.
The goal of the Q is to be tiny, and tiny != fast unfortunately


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06-04-2013, 11:22 AM   #9
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QuoteOriginally posted by Adam Quote
The goal of the Q is to be tiny, and tiny != fast unfortunately
But Gibby's point was that there exist lenses that are very small and much faster than the native lenses(many even made by Pentax).
06-04-2013, 11:57 AM   #10
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QuoteOriginally posted by kenafein Quote
To be fair, I don't consider any but the toy lenses cheap, but maybe they are when you consider all the features.
The 01 and 02 are amazing value when bundled in the clearance Q kits at $250 or thereabouts.
06-04-2013, 12:34 PM   #11
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Another theory is that fast lenses are not needed on digital camera's because it can be compensated by a higher ISO setting (compared to a film camera).
06-04-2013, 12:40 PM   #12
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Apparently it's possible to to make lenses like that for a reasonable price. If a small maker like MS Optical can make them, Pentax should be able to add AF and shutter due to production capability and a much higher production number. MS Optical Sonnetar 25mm f1.1 Q mount | Japan Camera Hunter
06-04-2013, 01:10 PM   #13
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QuoteOriginally posted by Kobayashi.K Quote
Another theory is that fast lenses are not needed on digital camera's because it can be compensated by a higher ISO setting (compared to a film camera).
The q is only good at ISO 320, or less.
06-04-2013, 01:40 PM   #14
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One of the main issues is the relative inability of digital sensors to accept light greater than T-value 2.0, with extreme drop off seen beyond 1.7. This is what contributes to the extent of vignetting that you never see in film.

Another factor is the precision in auto-focus required as you get to 1.7 and wider. While a few of the fast c-mount lenses are designed for quality IQ corner-to-corner, up to 5 mp resolution, and AF, they are expensive items. None of them were designed for precise and quick 12 mp, flare control, limited light fall off, natural bokeh, good close and distant performance, and compact dimensions all in one package.
06-04-2013, 01:44 PM   #15
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QuoteOriginally posted by ScooterMaxi Jim Quote
None of them were designed for precise and quick 12 mp, flare control, limited light fall off, natural bokeh, good close and distant performance, and compact dimensions all in one package.
But the MS Optical one shows that it's possible.
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