[rollei_list] Re: Rollei Retro Film

----- Original Message ----- 
From: "ERoustom" <eroustom@xxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Sunday, February 24, 2008 9:29 PM
Subject: [rollei_list] Rollei Retro Film


> Hello all,
>
> I took the chance and bought 100' roll of Rollei Retro 400 
> (135).
> Shot some through my Rolleiflex, and processed with 
> Rodinal 1+25 for
> 7.5 min.
> Not bad at all. The film curls something fierce about the 
> length of
> the roll (sprockets curl towards each other). I have very 
> little
> experience to make a reliable comparison, but so far this 
> has been
> the best film I've developed with Rodinal. Some of you 
> said it was
> Agfa by another name... Maco makes it.
>
> I thought I'd report on my findings.
>
> Elias
> ---
> Rollei List

    Are you using a hardining fixing bath? If not try one 
and see if if it helps with the curling. Curling is mostly 
caused by the differential shrinking of the emulsion vs: the 
support. Most film, both roll and sheet, has a coating of 
gelatin on the back to counteract the curling. Usually this 
back coating also contains the anti-halation dye. The dye is 
changed to a colorless form by the sulfite in the developer 
and fixing baths. Not all films have anti-curling coatings. 
My suggestion about the hardener is that it will tend to 
reduce the amount of shrinking.
    Its also possible that a developer which has less 
swelling effect on the emulsion may help. For instance any 
high salt type like D-76 will cause less swelling and 
subsequent shrinking than Rodinal. A real test would be to 
mix up some Kodak D-25 for comparison. D-25 is buffered to 
neutral pH and has very little swelling effect on the 
emulsion. It is an extra-fine-grain formula, essentially 
D-23 with the added buffer. It looses about 3/4 stop of 
speed when used full strength. At 1:3 it delivers full 
speed, about the same grain as D-76, and is an acutance 
developer.

Kodak D-25
Water (at 125F or 52C)                    500.0 ml
Metol                                       7.5 grams
Sodium sulfite, dessicated                100.0 grams
Sodium bisulfite                           15.0 grams
Water to make                               1.0 liter

Developing times and other characteristics are similar to 
Microdol-X but it is NOT the same developer.

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx


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