On 2016-03-24 10:47 , Larry Colen wrote:
The best price for quality I've found was this on the fotodiox caps:
https://www.fotodioxpro.com/rear-lens-cap-for-pentax-k-mount.html

The fotodiox caps tend to hold on fairly tight. The ones that say "pentax"
are cheaper and OK, the ones that say PK, suck.

for more $, but much better grip, which may be important for the kind of setup you are proposing, here is the Optech with the o-ring in a single mount (otherwise similar to the double-cap i previously linked):

<http://www.amazon.com/OP-TECH-USA-Lens-Mount/dp/B002S47R3E>


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