IlfordReciproc5Stops
510-Pyro KB14
510 - Pyro Agfa APX 400 FRESH ! Dated February 2023
Ilford+Foma Reciprocity-Failure Tests
IlfordReciproc5Stops
The Obelisk
The Wall
Frosty Hollow

IlfordReciproc5Stops

Ilford MGRC V Deluxe exhibits a little reciprocity error. Upper patch was exposed for 32 times as long as the row beneath it. It should have matched patch on far left. This experiment shows that doubling exposure-time causes a 1/50th stop loss of density due to reciprocity-failure.
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Equipment Used
Enlarger
Exposure
64 and 2 seconds
Paper & Developer
Liquidol
Digital Post Processing Details
Cropped, scaled in Gimp to look like original.
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  1. Yes
Martin Aislabie
Fascinating.
I notice reciprocity on my darkroom paper (Ilford Cooltone RC) - but never thought to test it in such a scientific manner.
Obviously the new MGV is much better at managing the phenomenon.
Martin
 

Media information

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Experimental Gallery
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albada
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Image metadata

Filename
IlfordReciproc5Stops.jpg
File size
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Dimensions
800px x 343px

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