Yes, they extend out to completely cover/protect the contacts.  They also have a rubber O-ring that help with some friction to keep the cap from turning and keeps any dust from getting to be back of the lens.

-p

On 6/24/2024 12:53 PM, [email protected] wrote:
Thanks, do they actually cover/protect the electrical contacts?

On June 24, 2024 10:46:21 AM PDT, Paul Sorenson<[email protected]>  
wrote:
I've had good luck with caps by OP/TECH USA from Amazon.  Over the years I've 
used both their singles and doubles.  Never had one come loose or fall off.

https://tinyurl.com/5n7y2xhm

-p

On 6/24/2024 12:15 PM, Larry Colen wrote:
I've found there to be a tremendous range in both quality and price of K-mount 
back caps for lenses. I have not found there to be consistent correlation 
between quality and price though.  Some of them will tighten down nicely and 
stay attached, others will stay loose and just fall off.
Has anybody found good deals on quality K-mount back caps?

     Larry
--
Larry Colen
[email protected]    sent from ret13est



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