why is the camera doing this with this lens?

momof4 · 12-10-2007, 11:22 AM

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!

egordon99 · 12-10-2007, 11:23 AM

Make sure the aperture ring (on the lens) is locked in the 'A' position.

travis_cooper · 12-10-2007, 11:33 AM

Originally posted by egordon99

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.

OniFactor · 12-10-2007, 11:33 AM

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)

egordon99 · 12-10-2007, 11:36 AM

Not a problem with Pentax/Sigma lenses. 99.9999999% sure it's the aperture ring not being on "A".

What say you momof4?

travis_cooper · 12-10-2007, 11:38 AM

Originally posted by OniFactor

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.

momof4 · 12-10-2007, 01:00 PM

Thanks----that was the problem!!!

12-10-2007, 11:22 AM	#1
momof4 Junior Member Join Date: Oct 2007 Location: North Carolina Posts: 30	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!

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12-10-2007, 11:23 AM	#2
egordon99 Inactive Account Join Date: Dec 2006 Location: Outside of Philly Posts: 1,561	Make sure the aperture ring (on the lens) is locked in the 'A' position.

12-10-2007, 11:33 AM	#3
travis_cooper Veteran Member Join Date: Dec 2007 Location: Salt Lake City, Utah, USA Photos: Gallery Posts: 300	Originally posted by egordon99 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
OniFactor Veteran Member Join Date: Nov 2007 Location: Binghamton, NY, USA Posts: 643	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
egordon99 Inactive Account Join Date: Dec 2006 Location: Outside of Philly Posts: 1,561	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
travis_cooper Veteran Member Join Date: Dec 2007 Location: Salt Lake City, Utah, USA Photos: Gallery Posts: 300	Originally posted by OniFactor 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
momof4 Junior Member Join Date: Oct 2007 Location: North Carolina Posts: 30 Original Poster	Thanks----that was the problem!!!

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