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08-01-2007, 05:28 PM   #1
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Digital Sigma 10-20mm to Film Camera

I have a Pentax *ist DL (digital) and a Pentax ZX-30 (film). I bought the Sigma 10-20mm lens for my digital but I wanted to see how it would work on the film Pentax. It has to aperture ring but I was still able to change the fstop on the film camera. Also there was no black edges. Whats digital about this lens?

Same photo full size from Wal-Mart.
(Black in front is from the pop up flash)



08-01-2007, 05:34 PM   #2
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Sigma call their digital specific lenses with reduced image circle for APS-C cameras "DC". They also give some lenses the "DG" nomenclature, meaning they have extra coatings on them for digital cameras. Is that one a DC? IF not it will be fine on a 35mm film SLR.
08-01-2007, 06:00 PM   #3
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Although, some of the Pentax "DA" series, which also has the smaller image circle do work okay on film, so this 10-20 may also be the same.
08-01-2007, 06:06 PM   #4
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What focal length did you take this photo at? 10mm? 20mm?

08-01-2007, 06:32 PM   #5
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QuoteOriginally posted by Arpe Quote
Sigma call their digital specific lenses with reduced image circle for APS-C cameras "DC". They also give some lenses the "DG" nomenclature, meaning they have extra coatings on them for digital cameras. Is that one a DC? IF not it will be fine on a 35mm film SLR.
It is a Sigma 10-20mm f/4-5.6 EX DC J.
08-01-2007, 06:33 PM   #6
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QuoteOriginally posted by FotoPete Quote
What focal length did you take this photo at? 10mm? 20mm?
Not sure, I did not look.
08-01-2007, 06:41 PM   #7
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Found It

I got my photos developed at Wal-Mart, not by myself. I just went back to check the negatives. When Wal-Mart printed the photos they automatically cropped out the black and blew up the photo to "fix" it.

The actual negative is the same size as a CDD sensor in my digital.

So I guess the digital lens works in a way.
08-02-2007, 05:30 PM   #8
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Ha, that's a laugh. Glad you got to the bottom of it.

08-02-2007, 06:30 PM   #9
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10-20 vignetting

hi guys

I tried the Sigma 10-20 on my Z1p. Looking through the viewfinder there is considerable vignetting at 10mm but this has cleared by 15mm Coincidentally this equates to the FF equivalent on APS-C. For comparison the DA15-45 has cleared at around 22-24mm but the 50-200 vignettes all the way from 50mm to 200mm.

Cheers from Oz
08-02-2007, 06:38 PM   #10
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wow.. a 15mm is still a very nice length for FF! Thanks for the info!
08-03-2007, 06:22 AM   #11
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QuoteOriginally posted by FotoPete Quote
wow.. a 15mm is still a very nice length for FF! Thanks for the info!
The 10-20 is the APS-C equivalent of the Sigma 15-30.
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