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Eclair Cameras: Re-marking an ACL Ground Glass for Super-16
I just answered an e-mail regarding alignment of Super-16 markings on an ACL
ground glass. I thought it a useful enough question to pass on. Mark.
Q: How much coverage should one expect from a s16 modified ACL? I have
recentered the viewfinder adapter and now the image is nice and centered.
However, I can only see roughly half of the additional s16 frame space. Is
this just the nature of the conversion?
A: The S-16 markings on the ground glass need to be made in exactly the right
place, so that the markings line up with a little convex lens that is glued
onto the whole ground glass prism assembly.
You can't assume that if you line up the new markings dead center with the
old, that this will necessarily work. In fact, I think that models with the
built-in light meter place this lens in a slightly different spot than those
without (if memory serves me correctly). So there isn't an exact
rule-of-thumb about where to place the new markings.
In the HD-144 kit I include a "S-16 markings" letraset rub-on so that your
tech can experiment beforehand with where to place the new markings before
having the etching done, to make sure the markings are positioned correctly
to be in perfect alignment with this convex lens. Otherwise the edge of the
image will indeed be cut off --- the convex lens is just exactly the right
length for S-16 (by chance).
I once had the S-16 markings put in an incorrect spot on an ACL ground glass
prism assembly, so I had to soak the prism in acetone, remove the little
lens, realign it by scotch-taping it in place and experimenting to find where
it needed to be for the new markings, and then re-attaching it with glue
that's used to bond glass (the kind that is activated by exposure to
Very, very painstaking work --- much better to have the markings etched in
the right place to begin with.
Also, with another ground glass assembly that I tried this with, the little
lens wouldn't come off even with acetone soaking.
(no, acetone didn't seem to affect the mirrored surface as far as I could
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