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04-14-2008, 11:37 AM   #1
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quick lens question

I was just wondering if anyone knew what that white bump on older lenses is for? I doubt it has anything to do with it's functionality, but I can't figure out it's purpose.

04-14-2008, 02:22 PM   #2
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furby,
When you hold the lens, before mounting, your thumb will fall just below the bump. Using the bump for reference, you can mount the lens with looking at the camera. It also can improve your grip and lessen the chance dropping the lens.

Dave
04-14-2008, 11:32 PM   #3
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QuoteOriginally posted by Big Dave Quote
furby,
When you hold the lens, before mounting, your thumb will fall just below the bump. Using the bump for reference, you can mount the lens with looking at the camera. It also can improve your grip and lessen the chance dropping the lens.

Dave
It lines up with the lens release. Some other lenses have a yellowish coloured bump instead of white.
04-15-2008, 12:53 AM   #4
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The FA 31 mm Ltd and FA 77mm Ltd have green bumps !!

While the 43mm Ltd doesnt have a bump at all !!

04-15-2008, 04:10 AM   #5
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The plastic bump is a useful index when changing lenses. Very similar to red plastic bump on Minolta MC/MD Rokkor lenses. On the Pentax it doesn't quite line up as well as the lens release button on Minolta bodies but work the same by giving a tactile reference point. Years ago when I used Minolta film cameras a lot, I could change lenses in complete darkness in seconds because I could do it by feel using the plastic bumps as a guide.
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