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11-07-2013, 10:30 PM   #1
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Join Date: May 2012
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No filter threads on F50/1.7

Today I found a fully functional Pentax SF1 with a F50mm/1.7 at a local thrift store ($23- woo hooo). The lens glass looks to be in perfect shape. However, the filter ring seems to be almost completely gone. there is one little piece left, but that is all. My question is whether the part is still available anywhere. I have seen the suggestion of gluing a standard 49mm filter (sans glass), but would prefer to keep it somewhat stock. I am not so worried about using filters (i.e. i would like to be able to use them, but can manage without) but i really am concerned about not being able to put a cap on the lens. Any suggestions for protecting the lens when you can't use a cap or filter? Also, does anyone know why the camera metering when using this lens might be so off. My usable pics, when looking at the info screen, appear to be almost 3 full stops underexposed. If my camera metering shows the image to be perfectly exposed, in reality the pic will be a white mess. I can compensate now that i know, but wondering if that is fixable. Any input/suggestions are welcome. Thanks.

11-07-2013, 11:39 PM   #2
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Location: New York, NY
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One could conjecture the lens took a serious hit which destroyed the filter ring. In this case the lens may be out of alignment internally--which could impact aperture operation, etc.

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