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11-01-2017, 01:19 AM   #16
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Starting buying metal Japanese screw-on lens caps back in the '80s, and they're all I use.

Like the way they feel, look, and protect.

11-01-2017, 05:13 AM   #17
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Just found this on eBay - any suitable ?

pentax pka lens cap | eBay
11-01-2017, 05:46 AM   #18
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QuoteOriginally posted by bdery Quote
My thought exactly. I'd rather have a plastic, clipped lens cap which can either shatter or jump out, taking some of the shock's energy with it along the way.

It's the same with modern cars : they're meant to absorb energy so you don't have to.
Somehow I doubt there's that much engineering to lens caps... just that plastic absorbs energy better than metal.
11-02-2017, 08:32 AM   #19
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QuoteOriginally posted by UncleVanya Quote
I replaced my da 15 hood as soon as possible with a pinch cap. The speed of putting screw on caps on and off is either too much of a pain and the cap says off longer than normal, or an impediment to a quick shot, or both.
I agree, I do not like the screw on caps! I've gone to the lens Hood Hats from OpTech for most of my lenses, & prefer them to even the pinch caps.

Hood Hat - Lens Cover | OP/TECH USA

11-02-2017, 08:43 AM   #20
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QuoteOriginally posted by Adam Quote
Wouldn't those screw-in caps be more likely to dent or damage the filter threads if impacted from the front?
It would make them less vulnerable as the impact force would be distributed over the entirety of the threads rather than a single point or small area.
You can demonstrate this by striking a bare bolt on the end with a hammer and look at the thread damage. Now try the same thing with another one with a nut screwed on covering the threads.
11-02-2017, 10:09 AM   #21
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QuoteOriginally posted by Parallax Quote
It would make them less vulnerable as the impact force would be distributed over the entirety of the threads rather than a single point or small area.
You can demonstrate this by striking a bare bolt on the end with a hammer and look at the thread damage. Now try the same thing with another one with a nut screwed on covering the threads.
That doesn't seem like a similar comparison. The lens threads area is a hollow section unlike the bolt. The problem Adam is talking likely has to do with the elastic vs. inelastic collision that may occur - how much the lens bounces off and how much energy is absorbed by the cap breaking or dislodging vs. how much energy is retained in the collision. I would think a metal screw in cap has a higher chance for an inelastic collision.

---------- Post added 11-02-17 at 01:10 PM ----------

QuoteOriginally posted by csa Quote
I agree, I do not like the screw on caps! I've gone to the lens Hood Hats from OpTech for most of my lenses, & prefer them to even the pinch caps.

Hood Hat - Lens Cover | OP/TECH USA
Do you see any wear on the lens where these contact them?
11-02-2017, 10:27 AM   #22
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No, no wear visible at all. These are a very soft material, so unlikely they would wear the finish on lenses.

11-02-2017, 11:18 AM   #23
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QuoteOriginally posted by csa Quote
No, no wear visible at all. These are a very soft material, so unlikely they would wear the finish on lenses.
Even fingers and bags wear lenses bodies over time - so I was worried. But good to hear that they do not appear to do so.
11-02-2017, 12:05 PM   #24
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QuoteOriginally posted by UncleVanya Quote
That doesn't seem like a similar comparison. The lens threads area is a hollow section unlike the bolt. The problem Adam is talking likely has to do with the elastic vs. inelastic collision that may occur - how much the lens bounces off and how much energy is absorbed by the cap breaking or dislodging vs. how much energy is retained in the collision. I would think a metal screw in cap has a higher chance for an inelastic collision.
QuoteOriginally posted by Parallax Quote
It would make them less vulnerable as the impact force would be distributed over the entirety of the threads rather than a single point or small area. You can demonstrate this by striking a bare bolt on the end with a hammer and look at the thread damage. Now try the same thing with another one with a nut screwed on covering the threads.
Yeah, what I'm thinking is if the cap gets hit and goes flying off (as would be the case with a plastic clip on cap), the force of the impact would be diverted away from the lens entirely as it bounces back from the collision.

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11-02-2017, 03:02 PM - 2 Likes   #25
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QuoteOriginally posted by UncleVanya Quote
Even fingers and bags wear lenses bodies over time
11-02-2017, 03:06 PM   #26
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Badges of honor.
11-02-2017, 04:14 PM   #27
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QuoteOriginally posted by UncleVanya Quote
Even fingers and bags wear lenses bodies over time - so I was worried. But good to hear that they do not appear to do so.
This is just my experience so far. I'm not a "heavy hitter" photographer taking hundreds of shots a day, etc. But so far I've not seen any wear on any of my lenses.
11-02-2017, 05:55 PM   #28
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QuoteOriginally posted by Adam Quote
Yeah, what I'm thinking is if the cap gets hit and goes flying off (as would be the case with a plastic clip on cap), the force of the impact would be diverted away from the lens entirely as it bounces back from the collision.
That's not my experience. Fortunately I had a UV screw-on filter that shattered but still protected the lens. I'm confident that if I had a metal screw on lens cap installed I would have suffered no damage. But I also kind of like the look and feel - not trying to convince anyone else - just interested in opinions.

Last edited by sibyrnes; 11-02-2017 at 06:00 PM.
11-03-2017, 12:02 AM   #29
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QuoteOriginally posted by UncleVanya Quote
Badges of honor.
Unless sandpaper is involved, which is tragically the case with pre-aged Leica cameras.

QuoteOriginally posted by csa Quote
This is just my experience so far. I'm not a "heavy hitter" photographer taking hundreds of shots a day, etc. But so far I've not seen any wear on any of my lenses.
My FA limited lenses are brassing up nicely. I don't mistreat my gear, but I don't coddle either.
11-03-2017, 05:49 AM   #30
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QuoteOriginally posted by Digitalis Quote
Unless sandpaper is involved, which is tragically the case with pre-aged Leica cameras.
WOW! What a tragedy.
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