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01-09-2017, 08:17 PM   #1
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HD DA 20-40mm Lens Cap Tip/Advice for those who experience it falling off

Hi Everyone,

I have found that when twisting the the lens cap, while on the lens, there is some type of seal created. And at least on my copy, the lens cap is much harder to fall off. Hope this helps those that experience this issue!

Just wanted to share this little piece of advice.


01-09-2017, 11:51 PM   #2
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The grooves in the spring-loaded tabs that push out against the filter threads are probably making better contact against the lens. I've found it necessary to do this on a couple lenses where it's been obvious the cap, for whatever reason, simply doesn't want to go right up against the end of the lens.
01-10-2017, 01:38 AM   #3
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Justin, are you referring to the push-on metal lens cap with the felt ring? Fortunately mine hasn't loosened yet - but I had a funny experience with it a couple of days ago climbing over a stile, when the end of a small springy branch got caught under the edge of the hood and flipped it into the air, which my wife then caught!
01-10-2017, 12:53 PM   #4
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I've been using a lens keeper on mine.

01-10-2017, 09:23 PM   #5
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Original Poster
Microlight, I'm referring to the push-on metal lens cap, with Pentax embossed. I think the felt is able to keep an air-tight seal. Hahaha, glad you were able to catch it!

LowVoltage, I think you're talking about the plastic lens caps with Pentax written in silver?

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