Re: The end of an era...

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ohad_drucker - 27 Jun 2006 17:09 GMT

I wrote a comparison between old Tech Pan rolls and new ones. Whoever of you who has been using tech pan rolls might be interested in reading it

http://www.covingtoninnovations.com/astro/techpan-drucker.pd

Large stocks of these old rolls are still largely available, not only from me but from many others, so try using those old rolls and see if they work for your application

P.S. only now I see that the last comment here is of Michael Covington, and my comparison has been uploaded to his website..

--
ohad_drucker

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Geoffrey S. Mendelson - 28 Jun 2006 07:21 GMT

> Large stocks of these old rolls are still largely available, not only from me but from many others,
> so try using those old rolls and see if they work for your application.

Ok, I'll bite, how do I get my hands on them?

Geoff.

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Nicholas O. Lindan - 28 Jun 2006 15:02 GMT

> I wrote a comparison between old Tech Pan rolls [199x] and new ones
> [200x].

I didn't notice any change over that period.

There were terrific differences between lots in the 1983-84 time frame. I
have
some '83 shots with incredibly fine grain*. A year or so later and ever
since
the grain has been in the same league as T-Max 100 in Microdol though Tech
Pan
is visually sharper, has higher resolution and the grain is "salt
& pepper" rather than overcooked oatmeal.

See Richard J. Henry, 'Controls in B&W Photography, 2nd ed.' pp 229-230.
Dr. Henry gave up on TP when this change came along. Kodak kept denying
there was any difference between lots.

--
* Maybe the grain was so fine because I purchased the rolls at Best's in
Yosemite?

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Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics, Photonics, Informatics.
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