5 Jul
2011
5 Jul
'11
11:12 a.m.
On Tue, 5 Jul 2011, Dave Caroline wrote:
But, THANK YOU for doing it!
If the mount and jig arre solid enough, it should be possible to align the
next frame without having to peer through the rig. If the mount is solid
enough, refocussing should not be necessary - set to MANUAL FOCUS, and
only focus once, with a visual re-check periodically.
BTDT.
no one image at a time not the whole fiche!
would be nice IFF such hardware were available.
>> Also makes it feasable to use cheaper optics
that are vignetting
> Possibly, but a lens that's extended (for
higher magnification) will reduce
> or remove the vignetting problem more quickly.
a relatively short focal length lens usually has a pretty wide cone, and
at those magnifications, even a C-mount lens will probably cover a 4x5
negative.
Why isn't
it suitable for lining up? ?It's a reflex -- so WYSIWYG. ?I
I have just done
most of one fiche the
squint down the eyepiece
move fiche to fit
press button see if it can focus, repeat move till focus got
take pic hold
still 4 secs
is a crap user experience! did you notice the qty in my other reply,
6k fiche say 71 images per fiche if we take the rrd53 as an average
and 8 secs per image
3408000 seconds of peering down the eyepiece getting backache
BTDT
In 1972 ("Environmental Systems Analyst"), we got a contract from EPA to
study the enforcemtn activities in the "great lakes" states, and what
effect they were having. My task was to photograph every document that
looked relevant in their files. (In Illinois, that included written
acknowledgements of payoffs!; in Minnesota it included documenting the
relative amounts of work put into shutting down Reserve Mining (with lies
in press conferences, etc.!) V less than 50% up time for Duluth's PRIMARY
sewage treatment plant; in Michigan, it included teaching remedial
photography techniques to their field operatives; and so forth)
We edited those images down to a 10,000 page documentary appendix.
I used a couple of pre-WW2 Leicas, a focoslide, and a Summar lens (a very
bad choice)
Most tripods from the 1960s through 1990s, you can remove the center post
and re-install it upside down, making a crude stand.
Since fiche image positioning is fairly standard, are there any dead
surplus fiche viewers that you could pilfer the stage and positioning
mechanism (with detents?) from? That mechanism combined with the
mounting parts of a cheap bellows slide copying attachment (and using a
much shorter focal length lens) would make a sweet, and even portable,
rig!
probably the right way is a pair of rollers and some
optics and the
scanner bar from a flatbed
and a hacked sane driver for the resultant scanner but keeping it in
focus will not be easy
For photography, if you an provide enough light, you should be able to
stop the lens down enough to give you a decent amount of latitude on the
focus. I realize that you will want an exceptionally small
Circle-Of-Confusion (the resulting blur size of a "point"), but a
"decent"
lens stopped way down (sharpest is, however, usually about three stops
down from wide open), should solve the focus change issue.
Although money is an issue, you might be able to build a cheap single
purpose rig (and then get filthy rich charging the rest of us for fiche
digitizing!)
Good luck,
--
Grumpy Ol' Fred cisin at xenosoft.com