Posted by Les on March 11, 2001 at 07:10:24:
In Reply to: changing lense from one board to another posted by Ian Garrott on March 11, 2001 at 00:09:33:
We've got several parts to deal with so let's start with what each of them are and who gets connected to what.
A lens is made of two cells, front and back, theses are threaded into (in your case) a shutter or barrel. The shutter is threaded into a retaining ring (something used with metal boards and has no screws) or a flange. The flange is mounted to a wood board usually with wood screws.
With a wood board, MOST of the time you should be able to unscrew the whole lens/shutter assembly, get to the wood screws in front, remove the flange and install it on the new board.
If they put the flange on backward, then you mayn need to remove the rear cell to get to the screws.
On rare occasion on wood, and sometimes on metal, there is a
retaining pin on the shutter to keep it from rotating. They are
usually hidden and this will mean you need to remove the wood
screws from the flange and try to rotate the flange like a nut
rather than rotate the shutter. This is how retaing ring are used,
and a special spanner wrench is used to remove them although I've
used a screwdriver to get them off with major scratching of the
back of the lensboard and a few stitches where the screwdriver
entered my other hand.