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10-04-2009, 11:34 AM   #1
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Sigma 90-300mm lens keeps falling off camera

I recently bought a used sigma 90-300mm lens for $25.00.

I have to adjust the aperture and focus manually, which isn't a problem.

Problem is it keeps falling off my camera.

Not quite sure what mount iti is, doesn't have the orange tell-tale dot to line up when mounting it. But, it will go on and does focus fine and take clear picture.
You just can't pull-on it too hard or it will come off.
The lens just sort of hangs there by a small notch, but it does fit snuggly
Each time you mount the lens it fits on a little different with the aperture numbers in a different place. The mount looks like a k-mount,
but it is something else.

Any ideas what mount this is?

thanks

10-04-2009, 11:39 AM   #2
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Join Date: Nov 2008
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Try comparing it to the mounts shown here.
SLR Lens Mount Identification Guide
10-04-2009, 02:10 PM   #3
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Must be a Nikon lens.
10-05-2009, 07:13 AM   #4
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QuoteOriginally posted by deadwolfbones Quote
Must be a Nikon lens.
I agree, it most likely is. I have a couple Nikon lenses still and they will fit on the camera but won't lock. Your best bet is to sell it and find one with the Pentax mount. At $25 you might even come out ahead on the deal.

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