[pure-silver] Re: donuts on prints
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Wed, 9 May 2007 01:54:26 -0700
----- Original Message -----
From: "Shannon Stoney" <sstoney@xxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Tuesday, May 08, 2007 7:31 PM
Subject: [pure-silver] donuts on prints
Yet another weird mystery in the darkroom....
Today I noticed that there are these light-colored donuts
right in the center of the prints I was making yesterday.
They are Holga panoramas, so I was printing a five inch
strip of 120 film by laying it on the glass negative
carrier that's for 8x10 negatives. It has frosted glass,
I guess to prevent newton rings or something. But now
there are these other kinds of rings!
I was using the 135mm enlarging lens, which appeared to
cover the negative fine. I had it stopped way down to
f/32 though, because the head had to be so close to the
print to make it only 12" long.
The head is a diffusion head.
Is it possible that this frosted glass is creating this
problem? I have used it before and never noticed it
before.
Another clue: I cleaned the frosted glass with Windex
before printing. I think I got it all dry. But it's
possible it was slightly dampish when I was printing. I
printed three negative strips, and all three sets of
prints have this strange anomaly on them.
You can see the phenomenon here:
http://www.flickr.com/photos/shannonstoney/490698167/
My partner said I should just say it was a picture of
nuclear winter in Houston.
--shannon
Or a flying saucer.
Mark Blackewell made the excellent suggestion of seeing
if this artifact is on the negative. If it is NOT post some
details of your enlarger. You said it was a diffusion type
but there are several variations on that theme and some of
them are capable of this sort of unevenness. I have some
other ideas too but they are all pretty unlikely. If you can
see the effect on the baseboard look back through the lens
(using a dark filter if necessary) you may be able to see
the cause.
Maybe you have a plague of gremlins.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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