Originally posted by Mike Cash Easy to install and remove (on those rare times I remove it) with just a fingernail.
Same can be said of the pentax adaptor.
That said, be warned. The fingernail technique leaves them prone to 'pop' out, and being round, like filters and lens caps, they like to roll.
I was reminded of this to my cost yesterday, when mine rolled off of a railway platform and onto the track. Luckily (and this is generally not something I'd advise), this was a back-of-beyond railway terminus (Looe, UK), one platform, train once a blue moon, and the adaptor was right by the buffer stop, so after duly checking for trains I hopped down to get it!