The idea for this puzzle came while I was working on some recent photos...
I think this puzzle is rather simple. (And there is some interesting
physics in it.)
What is this:
http://42graphy.org/misc/puzzle-2015-06-29/_IR26728-3.jpg ?
Engrave your answer on the outside of the barrel of DA 15mm f/4 Ltd lens,
and send it to me.
:-)
Igor
--
PDML Pentax-Discuss Mail List
[email protected]
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above and follow
the directions.
