Re: Tech Pan

["Thomas \"Hank\" Hogan" <thogan@xxxxxxxxxxx>]

This is the way that I use HC110 developer -- I find it gives me
extremely reproducible results.
Making HC110 dilutions with the viscous, honey-like HC110 concentrate for
250 ml (small 35mm tank)
		=09
Approx. Dilution		Concentrate	Water
	A 1:32		16 cc		250
	B 1:64		12 cc		250
	C 1:40		 8 cc 		250 for aerial IR - HIE at EI 25 for 5=92 24=B0 Centigrade
	D 1:80		 6 cc		250  I use this for Tech Pan EI 100 for 5 min at 20=B0C
	E 1:96		 5 cc 		250=20
	F 1:160		 3 cc		250  I use this for Tech Pan EI 25/32 for 5 min at 20=B0 C


  Over the years most of my photography
has been through inverted light microscopes and I have used Kodak Tech Pan
film with a Wratten #58 (broad band green filter centered at 560nm) which=
 cuts
out the extended red sensitivity of the film and spherical
abberation effects.  I prefer to use dilute developers for increased
sharpness.

I sometimes use the Technidol liquid developer which is considerably more
expensive but is one of the best alternatives for "pictorial" and extremely
fine grain.  I have used  35mm Tech Pan and Technidol for copy stand work
when a larger format camera was not available because we were out of film.

At 10:08 PM 8/22/97 -0500, you wrote:
>>After a trying at least ten developers with Tech Pan, I settled on
>>Pota for best results and for almost as good results but considerably
>>less hassle, HC110 at 1+200 for 20 minutes, 20C, one inversion every 2
>>minutes, gives 25ASA ish. Use this as a starting point anyway.
>>(the flavour of HC110 which gives "dilution B" as 1+31, so this is more
>>or less dilution B 1 + 5. You might not be aware but two strengths of
>>HC110 are available.)
>
>I'm a big fan of HC110 and would like to use it with 120 Tech Pan.=20
>However I need some clarification on dilution ratios.
>When you say "1=3D200" do you mean diluting the stock solution or the=20
>Concentrate solution with water?
>I did not know two strengths of HC110 were available. Do you refer to the=
=20
>concetrate and stock solutions again?
>And finally, do you filter your Tech Pan when shooting? If so what=20
>filtration?
>
>Russ Rosener
>Washington University, St. Louis.
>http://ascc.artsci.wustl.edu/~rrosener/
>
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