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Old 16th May 2020, 06:00 PM
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Martin Aislabie Martin Aislabie is offline
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Location: Stratford-upon-Avon, England
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Originally Posted by Richard Gould View Post
This is Rodinal by a different name, I use the same developer, just under the Firstcall brand and cheaper, but made by Compard, probably the advert is refering to the ''Edge Effect'' which make a well focused negative appear to be sharper
Richard
The edge effect actually called acutance - and is a well known affect when using very dilute developer.

If a developed area and an undeveloped area are located side by side the edge of the developed area gets extra density due to the increased developer activity along the edge - the theory being the developer in the undeveloped area helps replenish the spent developer working locally in the developed part.

You need to be careful at taking American adverts at face value - they don't have an advertising standard requiring adverts to be truthful - they can claim anything they like.

Martin
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