Confused with speed on mid-tones

baachitraka · Jul 6, 2015

On certain combination of film and developer I personally experience speed lose when I based my exposure on shadows and expose at box speed.

What do I experience if I based my exposure on mid-tones? and develop for shadows with minimal agitation.

I curios because, I follow this method and get almost perfect negatives to print.

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gone · Jul 6, 2015

You're doing what I have always done, and it works well for me as well. Of course the agitation depends on the developer/film combination I suppose. Certainly don't want to over agitate w/ Rodinal.

Sirius Glass · Jul 6, 2015

I expose for the shadows when I want the shadows as the middle gray. I use the shadow measurement and offset it if I want the middle shade of gray in another zoom. I have never had a film speed loss from doing that.

baachitraka · Jul 7, 2015

The scheme was with minimal agitation i.e., 10s in every 5 minutes with Rodinal 1+50.

I am always wonder how to determine speed for mid-tones based system.

Oscar Carlsson · Jul 7, 2015

I'm curious as to what you mean by 'speed loss' when basing your exposure on a shadow reading. How do you measure it? How does it manifest? What is your definition of basing exposure on shadow or midtones?

What's your developer? What is minimal agitation? What is normal agitation?

I suspect that terms is very important in understanding the issue you are having, and I'm also pretty curious.

baachitraka · Jul 7, 2015

(there was a url link here which no longer exists)

I follow the technique as written in the article. First few paragraphs are quite interesting.

RalphLambrecht · Jul 7, 2015

baachitraka said:
The scheme was with minimal agitation i.e., 10s in every 5 minutes with Rodinal 1+50.

I am always wonder how to determine speed for mid-tones based system.

I'm confused by that.Isn't speed based on shadow density by definition?:confused:

RalphLambrecht · Jul 7, 2015

Oscar Carlsson said:
I'm curious as to what you mean by 'speed loss' when basing your exposure on a shadow reading. How do you measure it? How does it manifest? What is your definition of basing exposure on shadow or midtones?

What's your developer? What is minimal agitation? What is normal agitation?

I suspect that terms is very important in understanding the issue you are having, and I'm also pretty curious.

I understand 'speed' as a target density for a given zone(0.1 for ZoneI or 0.75 for Zone V)

RalphLambrecht · Jul 7, 2015

baachitraka said:
(there was a url link here which no longer exists)

I follow the technique as written in the article. First few paragraphs are quite interesting.

already in the first sentence this article goes against everything I know about the Zone System(exposure and not development places shadows)I think I'll stick to AA on this one.

Confused with speed on mid-tones

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