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12-10-2007, 11:22 AM   #1
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why is the camera doing this with this lens?

The camera (brand new K100D Super) was working fine with my 18-55 lens and then I changed to my Sigma 70-300mm lens and it won't work----on the screen on the top it says AV and it is flashing and it has two dash -- marks next to the letters AV. It won't let me take a picture----what is going on? I have the camera set on ISO 400 and it was on auto with autofocus and shake reduction. Any ideas? Thanks!

12-10-2007, 11:23 AM   #2
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Make sure the aperture ring (on the lens) is locked in the 'A' position.
12-10-2007, 11:33 AM   #3
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QuoteOriginally posted by egordon99 Quote
Make sure the aperture ring (on the lens) is locked in the 'A' position.
Ditto, that means that the lens is controlling the aperture by its ring and you can only shoot on av or m mode, possibly p, but I'm not sure. The ring is usually right up next to the mount to the camera body.
12-10-2007, 11:33 AM   #4
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dunno if such is the case with Pentax cameras, but, for Sony/Minolta, older Sigma lenses do not work, because sigma hadn't correctly figured out everything that the minolta lenses had in them, and they stopped working after a few generations.. IE, a 1985 sigma lens for first generation Minolta wouldn't work any more on a second generation body (1989ish)

12-10-2007, 11:36 AM   #5
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Not a problem with Pentax/Sigma lenses. 99.9999999% sure it's the aperture ring not being on "A".

What say you momof4?
12-10-2007, 11:38 AM   #6
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QuoteOriginally posted by OniFactor Quote
dunno if such is the case with Pentax cameras, but, for Sony/Minolta, older Sigma lenses do not work, because sigma hadn't correctly figured out everything that the minolta lenses had in them, and they stopped working after a few generations.. IE, a 1985 sigma lens for first generation Minolta wouldn't work any more on a second generation body (1989ish)
This isn't a problem with compatibility, I have the same lens and it works just fine. It is the aperture ring for sure.
12-10-2007, 01:00 PM   #7
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Thanks----that was the problem!!!
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