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03-25-2010, 10:20 AM   #1
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Rear lens caps

Another silly newbie (to Pentax) question:

I'm a recent convert to Pentax from the Minolta film SLR world. I was surprised to find that the rear lens cap on my lenses are not interchangable. What I normally did (on the Minolta) when changing lenses was to grab the new lens, swap it with the lens currently on the camera, and just swap the rear lense cap over to the just-removed lens (rather than having to dig for one in the bag). But with several of my pentax lenses, I'm finding the rear caps aren't interchangable? Not sure how this can be since all the lenses have to interface to the camera in the same way...

If I buy some 'generic' caps off of eBay, will I be able to use them as universal caps?

03-25-2010, 10:27 AM   #2
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I have 4 bayonet lenses (3x Pentax and a 3rd party) and the caps are interchangable.

I have noted however that some of the caps are like the the bayonet on the camera so you 'twist' them on and others are one ones that you push one; I have two of each for the four lenses.
03-25-2010, 10:33 AM   #3
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QuoteOriginally posted by sterretje Quote
I have 4 bayonet lenses (3x Pentax and a 3rd party) and the caps are interchangable.

I have noted however that some of the caps are like the the bayonet on the camera so you 'twist' them on and others are one ones that you push one; I have two of each for the four lenses.
One example is that a Quantaray cap will not fit a Pentax lens. Not sure if the mount is slightly different and the cap is designed to accommodate that or what...
03-25-2010, 10:57 AM   #4
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For some rear caps (notably Tamron), you have to align the dot (or a bump, or some mark) on the cap with the dot on the lens. I don't know if Quantaray is one of this kind.

The caps are still interchangeable among different lenses; you just need to align the cap and the lens.

03-25-2010, 10:57 AM   #5
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That's the first time I hear of this. I also have two types of caps, the bayonet type and the push-on type that you force on. I find that the bayonet type doesn't stay on very tightly, while the push-on type is a bit tough to get on sometimes.
03-25-2010, 11:32 AM   #6
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QuoteOriginally posted by GoremanX Quote
That's the first time I hear of this. I also have two types of caps, the bayonet type and the push-on type that you force on. I find that the bayonet type doesn't stay on very tightly, while the push-on type is a bit tough to get on sometimes.
And a pain to get off.. I buy these 10 at a time both for my use and reselling lenses that didn't come with caps for some reason..

Rear Cap For Pentax PK K-X K-M K20D K10D K100D K200D KX - eBay (item 250592633844 end time Apr-06-10 10:31:47 PDT)

03-25-2010, 11:38 AM   #7
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QuoteOriginally posted by SOldBear Quote
For some rear caps (notably Tamron), you have to align the dot (or a bump, or some mark) on the cap with the dot on the lens. I don't know if Quantaray is one of this kind.

The caps are still interchangeable among different lenses; you just need to align the cap and the lens.
Yeah, while most caps are made with smaller sized bayonet mounts so they can 'screw' onto the lens at any of the 3 possible positions, I think the tamron caps (and possibly others) are designed with the actual threading distances of the bayonet mount - meaning the can only be attached, as bear said, by lining up with the dot on the cap, just as you have to line up the lens with the red dot on the camera.

I am guessing quantarays are probably rebadged tamron lenses, and therefore have those same caps, requiring they be mounted in line with the red dot on the lens. I just noticed this recently with one of my tamron TCs - all along I have just been twisting 1, 2 or 3 times until I got it right (never noticed the dot on the caps before!).
03-25-2010, 01:03 PM   #8
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I'll try it again tonight and report back!

03-25-2010, 02:58 PM   #9
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Upon further examination, it's only one cap that's problamatic- it just happens to be on a lens I use frequently. It goes on with difficulty on the lens it came with, and not at all on the others.

I swapped the caps around so this one stays in the bag most of the time, and the problem should be essentially solved
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