paper negatives
Jan 20, 2015 16:11:37 #
I've decided to try using paper negatives with pinhole cameras. Does anyone know how I come up with a ISO value to figure exposure times. Do I start off with the same ISO as film. Harmon Direct positive paper worked well with an ISO of 3 but I'm having trouble finding a scale or chart that will get me in the ball park so I can tweek the exposure times using a pinhole exposure chart. I found videos on pre flashing and contact printing but nothing on how to come up with an exposure time for paper negatives.I'm going to tryRC grade 2 by ARISTA. I'd like a starting point so I don't waste a pack of paper and have nothing to work with. Thanks in advance.
Jan 20, 2015 16:24:23 #
farnsworth52 wrote:
I've decided to try using paper negatives with pin... (show quote)
I've done this with some Kodak paper, I think it was Kodabromide Grade 2, back in the early 70s. I believe I used an ISO of around 3 and it worked rather well. I used a 4x5 view camera instead of a pinhole.
--Bob
Jan 20, 2015 16:33:51 #
rmalarz wrote:
I've done this with some Kodak paper, I think it was Kodabromide Grade 2, back in the early 70s. I believe I used an ISO of around 3 and it worked rather well. I used a 4x5 view camera instead of a pinhole.
--Bob
--Bob
I thought I'd start where the direct positive paper ISO was 3 But I thought I'd check with the other hogs to see if anyone had experience. Did you pre flash the Kodak paper and how was the contrast
Jan 20, 2015 16:50:40 #
farnsworth52 wrote:
I thought I'd start where the direct positive paper ISO was 3 But I thought I'd check with the other hogs to see if anyone had experience. Did you pre flash the Kodak paper and how was the contrast
No, I didn't pre-flash the paper. Just put it in a negative holder, used single weight paper, and used a fairly bright light. I don't recall the exposure, but more than likely used a f-stop of 5.6. That was the best the lens could do.
I developed in Dektol, but don't remember the dilution ration. It most likely was my usual of 1:4.
The results were surprisingly good. Years later I scanned the negative, as if it were film, and it worked pretty well.
--Bob
Jan 21, 2015 07:01:53 #
melismus
Loc: Chesapeake Bay Country
Long ago I shot a lot of paper negatives, 4x5 and larger, and contact-printed them. Most papers had printing on the back and were therefore useless for this; the sole execption back then was Ilford.
Jan 21, 2015 12:37:44 #
I haven't done this for many decades
but, in my opinion
you are in a grey area
no matter what, you will go through some paper finding a reasonable answer. An ASA of 2 or 3 would be a guesstamate but a start...
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