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06-08-2010, 10:59 AM   #1
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APS-optimized lens on 36x24 body?

I don't think that Pentax is going to release a 36x24 camera this year. Just my hunch.

But I'm curious... What happens if I take an APS optimized lens (like my Pentax 40 limited, or 70 limited) and put it on a 36x24 body?

Will

06-08-2010, 11:05 AM   #2
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Some lenses are actually OK but most will vignette badly.
06-08-2010, 11:16 AM   #3
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When I got my K10D (my first dslr), I still had a few frames of film left on the roll in my SF1. Just for kicks, I put the 18-55mm kit lens on and shot some film.

At 18mm, it vignetted badly. The image circle was clearly evident. The ends of the frame were round and the top and bottom of the circle were cut off. I think that the image circle was probably about 32mm in diameter, meaning it almost filled the frame horizontally. To fill a 24 x 26mm frame, without vignetting, the circle must be about 44mm in diamter.

At 55mm, there was no problem. No sign of vignetting and no barrel distortion.

The "break even" point was about 30mm. Shorter than that, there was vignetting, above that no vignetting, although there was some barrel distortion.
06-08-2010, 11:57 AM   #4
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QuoteOriginally posted by WMBP Quote
I don't think that Pentax is going to release a 36x24 camera this year. Just my hunch.

But I'm curious... What happens if I take an APS optimized lens (like my Pentax 40 limited, or 70 limited) and put it on a 36x24 body?

Will
Will

there is a thread somewhere in the lens forum that has been testing da lenses on film cameras.

From my own experience, my sigma 10-20 is good from about 13mm upwards on FF. tried it out on my PZ-1

06-08-2010, 12:14 PM   #5
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If you mean on an hypothetical 24x36 DSLR, then I'm 99.9% certain Pentax would implement a "DA" mode, like Nikon does. I.e. when you mount a DX lens on an FX camera, the latter recognizes this and can switch into "crop" mode automatically, using only the "APS-C" center portion of the sensor (with a resulting loss of MP, of course).
06-08-2010, 03:05 PM   #6
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QuoteOriginally posted by Lowell Goudge Quote
Will

there is a thread somewhere in the lens forum that has been testing da lenses on film cameras.

From my own experience, my sigma 10-20 is good from about 13mm upwards on FF. tried it out on my PZ-1
This here thread, here?
06-08-2010, 05:55 PM   #7
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Just for ducks, I put my pathetically few DA's on my FF ZX-M. The 18-250 vignettes all the way out. The 18-55 vignettes at 25mm and below. With the 10-17 below 14mm I observe the expected vignetting, but mostly from the hoodlet. If that hoody could only be removed... Anyway, my manual Zenitar-K 16, Lentar-Tokina 21, and various 24's are in no danger of losing their jobs. And the other ~95 lenses are all FF, so I'm ready for the K9FF/K30D or whatever it is.
06-08-2010, 06:51 PM   #8
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QuoteOriginally posted by RBellavance Quote
If you mean on an hypothetical 24x36 DSLR, then I'm 99.9% certain Pentax would implement a "DA" mode, like Nikon does. I.e. when you mount a DX lens on an FX camera, the latter recognizes this and can switch into "crop" mode automatically, using only the "APS-C" center portion of the sensor (with a resulting loss of MP, of course).
He's talking about using DA lenses on film bodies.

06-08-2010, 09:14 PM   #9
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QuoteOriginally posted by alohadave Quote
He's talking about using DA lenses on film bodies.
No, he is talking about using DA lenses on FF bodies. Without specifiying - film or digital.

PS: I hope Pentax make autocrop configurable. Because if I put DA lens on FF cam - I know what I'm doing and don't want to crop photo.

PSS: 40 Lim and 70 Lim work fine on FF. Just like 55*, 200* and 300*. What about 60-250 - I don't know.
06-09-2010, 01:11 AM   #10
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QuoteOriginally posted by Zebooka Quote
No, he is talking about using DA lenses on FF bodies. Without specifiying - film or digital.

PS: I hope Pentax make autocrop configurable. Because if I put DA lens on FF cam - I know what I'm doing and don't want to crop photo.

PSS: 40 Lim and 70 Lim work fine on FF. Just like 55*, 200* and 300*. What about 60-250 - I don't know.
Well, until Pentax has a FF, then yes he is talking about film.
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