[rollei_list] Re: Rodinal, TMax, scanning

Bob, I think the difference between your drum scanners and the Epson might be 
that you were probably using a mounting fluid with the drums.  You can avoid 
Newton rings with the Epson flatbeds by using a mounting fluid -- messier but 
effective.

With Tri-X, I rarely have a problem with Newton rings unless the negative has 
large areas of clear film.  With some other films with thinner emulsions, like 
Tech Pan, Newton rings are a constant struggle for me if scanning them directly 
on the glass without mounting fluid.

Sanders

On Mar 23, 2011, at 1:07 AM, Bob Smith wrote:

>> 
>> From: Bob Smith <notraces@xxxxxxxxx>
>> Subject: [rollei_list] Rodinal, TMax, scanning
>> Date: Mon, 21 Mar 2011 09:11:28 -0400
>> 
>> I read this from Sanders this morning and I wanted a little clarification - 
>> I could be misinterpreting the thought. I've never heard of underexposed 
>> negs causing Newton Rings. Am I understanding this correctly? I spent many 
>> years selling both high-end drum scanners (Hell Graphics / Linotype / Scitex 
>> - along with flatbed scanners from Iris / AGFA, etc) - and I never recall 
>> hearing Newton rings can be caused by underexposed negatives. Now I'm 
>> curious and just looking for some clarification.
>> 
>> Thanks.
>> 
>> Bob Smith
>> 
>> "I am curious to hear more about your experience in scanning 
>> underexposed film directly on the glass.  My experience is that it
>> is a nightmare, because of the Newton rings caused by the bare
>> substrate on the glass (a problem I rarely encounter with a lot
>> of developed emulsion in a well-exposed negative).  How do
>> you avoid this problem with underexposed negatives on the glass?"
>> ------------------------------

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