120 film suffers badly from lack of film plane flatness -- it's thin
film rolled into a tight spool, then unwound intermittantly and
stretched across a 6 cm square hole very slightly looser than the
paper backing. Not an ideal situation, and the older the film, the
worse the problem.
Just for fun, put a roll of bad film into a 120 camera sometime and
remove the lens and open the shutter. You can see the lack of
flatness....
Peter
On Nov 15, 2008, at 4:06 PM, OK Don wrote:
I loved Tech Pan - started using it when it was a special order item
and only had a number - pre-name. We used it for B&W aerial
photography - used M Leicas and 50mm Summicron lens. The red bias of
Tech Pan coupled with the extremely high resolution and extremely fine
grain menat that your ability to hold tha camera steady was the
limiting factor. We good some very good 16x20 prints from it. (Also a
lot of blurry useless negatives). I never had as good results with the
120 TP as I did with the 35mm - it was a slightly different emulsion,
but didn't get a good tonal range, nor the "sharpness" that we did
with the Leica/TP combination.
Someone has done some work with a flatbed scanner attached to the back
of a view camera - can only be used on stationary subjects, but
captured a LOT of pixels --- took some driver hacking to get it to
work - beyond my skills.
On Sat, Nov 15, 2008 at 11:36 AM, Peter Frederick
<[EMAIL PROTECTED]> wrote:
That MicroNikkor is a great lens, but the mid 70's Vivitar Series
1 90 mm
is better, at all aperatures and distances. Not a cheap lens,
though! List
was $349 or so in 1978.
Kodachrome was available in 16mm initially (1934, I think), then
medium
format (120), sheet of all sizes, and 35mm (1936 or so). The initial
version was not anything like the later ones, is quite rare now,
and fades
horribly.
You can only get really good 35mm images by using a weighted
tripod with a
large, heavy head, and a camera that does not produce significant
shutter
vibration. Otherwise, camera movement will significantly degrade
the image.
I found this out while playing with some Technical Pan film for
pictoral
work. Hard to believe you can reproduce such tiny detail if you
are VERY
careful. I've got a picture of the lake on campus at SIU, and
with a grain
magnifier you can read the labels on the discarded soda cans on the
shoreline....
I know there are digital cameras with this kind of resolution, but
I think
they are about the size of a bus these days, and fly around in
orbit spying
on us.
Peter
--
OK Don, KD5NRO
Norman, OK
"There are only three sports: bullfighting, motor racing, and
mountaineering; all the rest are merely games." - Ernest Hemingway
'90 300D (Rattled), '92 300D (Saber), ''97 Ply Grand Voyager
(Vincent van-go)
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