If I were in your position, I'd consider sticking a lens cap leash on the vf-2. If you're not aware of what that is, I'm thinking of the adhesive disc with the lanyard coming out, the disc usually sticks to the lens cap, and the lanyard loops around the lens barrel. Camera stores usually sell them at something like a 500% markup, you can also get them online for a lot cheaper
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http://www.photoklarno.com
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http://www.photoklarno.com