Re: Hi all, and a bit of a newbie question.

[peteray@xxxxxxxxxx (Peter Ray)]

Russ wrote,

>I metered in the reflected mode using a Gossen Luna Pro F. The ASA was set
>at 40, to take the effect of the filter into consideration. When I
>processed the first roll in Rodinal 1:50 for 15 minutes. It showed bad
>overexposure, so much so that I had to reduce the negatives in Potassium
>ferricyanide. Avoid this! The second roll I cut my develpoment time to 10
>minutes, and it was much improved, but still obviously overexposed. These
>went into the reducer soup as well, but required less time.
>
>So I arrived at a working ASA of about 100 using a handheld meter with
>this setup. For daylight work and Konica I've found much the same ASA
>works metering through the lens as well.


Generally speaking, development controls contrast and exposure controls
density. With that first roll were they overdeveloped or overexposed? While
there is a slight change in ASA when you change developing times, it
doesn't make film less exposed. Correct exposure is whatever you're seeking
but is usually printable detail from shadows to highlights. Overexposure
should be adjusted by less exposure.

Also critical is agitation. Whenever you have a highly dilute, but powerful
developer (rodinal/HC110) you can get anywhere from a highly compensating
developer that easily prints tones from shadow to highlight or a contrasty
effect, simply by altering the time, frequency or strength of agitation.

Peter




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Topic No. 16