[pure-silver] Re: Durst M605 - not in focus from edge to edge
- From: Lloyd Erlick <lloyd@xxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Wed, 06 Dec 2006 09:55:42 -0500
At 09:35 AM 12/6/2006 , you wrote:
>Hi Janet,
>
>You can avoid Newton rings by either Anti-Newton glass in the carrier
>(the upper glass), but that you probably new. Another trick is to apply
>a minute amount of powder: I used powdered medical gloves: snapping such
>a glove near the carrier plus negative (open ofcourse) was sufficient
>(nowadays medical powdered latex gloves are phased out because the
>powder (I thought it was maize powder) can cause allegic reactions).
>Other people have used starch powder (I thought, maybe also chalk dust))
>they filled a "bulb" with the stuff and squeezed it very gently near the
>neagtive plus carrier (see
>http://www.electricedge.com/greymatter/archives/00006060.htm , scroll
>down to the bottom for the type of bulb I mean.
>
>Good luck,
>
>Cor
December 6, 2006, from Lloyd Erlick,
Another method, that involves no dust, is to cut a window out of something
suitable like black plastic from a photo paper bag, or black paper like the
kind used for 120 format film backing. Make the window just the right shape
for a frame, and tape it in position in the neg carrier. When the neg is
placed within the window, and the carrier closed, the glass will not be in
quite such close proximity to the neg, and rings will not form. The
glass/carrier/negative will not be tilted if the mask surrounds the frame
(i.e., provides support evenly around the neg, so no tilt occurs). If negs
are in strips of multiple frames, the mask could be two strips placed
across the glass just far enough apart to accommodate the strip. The key is
to keep the glass apart ever so slightly but still hold the neg flat.
Frankly, an investment in quality anti-newton glass is very worthwhile.
It's very likely your enlarger has the right glass out there as an
accessory, just needs to be found. I paid seventy-five dollars for a set
for my Durst, and even though it is clearly overpriced, it was well worth
it over the years of work.
If I could magically cure your rings problem, but it would cost you ten
cents a time, you'd soon (well, eventually...) have enough prints done to
make it cheaper to buy your own hundred dollar AN-glass ...
Glass negative carriers are definitely the right tool. I went glassless for
years, and the first print I made with a glass carrier was so much better I
could see it immediately, especially in the corners. Some films seem to be
more prone to Newton rings than others. I'm told color film is especially
bad, but I never handle color negs.
regards,
--le
________________________________
Lloyd Erlick Portraits, Toronto.
website: www.heylloyd.com
telephone: 416-686-0326
email: portrait@xxxxxxxxxxxx
________________________________
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