I wonder if it's some kind of add-on device intended to lock the focus
in place? Maybe the instructions are for the device itself.
From: Mark Roberts
Darren Addy wrote:
Not aftermarket. It clearly shows in the paperwork accompanying the
piece. However, I'm mystified.
Is that included paperwork an official Pentax document? No Pentax logo
or any other company name/logo. It could be a slip included by some
company doing the modification. Typeface looks like Pentax data
sheets, but it's a pretty common typeface for Japanese manuals.
My guess: This is a 3rd party modification (or perhaps really uncommon
Pentax factory mod) for macro. It looks as if the lens has been
modified to move the lens elements farther away from the focal plane
to achieve close focusing capability. That would explain why there's
no autofocus.
http://www.ebay.com/itm/smc-PENTAX-FA-50mm-f-1-7-Exc-/221204147488?pt=Camera_Lenses&hash=item3380cb6d20
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