Over the last few months I've been getting unexplained results for paper negatives [pure white after development] except for very long [2 minutes or greater] exposures
My two Weston V meters checked against Nikon digital camera [100ISO digital camera setting versus 6ISO paper negative]. Gave same ‘reflected’ result after correction for change in ISO rating.
Used four 4x5 paper negatives cut from single 8x10 multigrade paper. Prior paper from same box gave four obviously exposed images
Last tests done with incident readings with sun diagonally behind subject. Camera 3m in front of subject. Same subject and camera-subject distance for all four exposures. All images taken in about 30 minutes.
Four images using 4 different lenses
135mm xenar in copal #0 shutter
4 ¼ inch Wray no shutter, but hat used to control length of exposure
180/315mm Symmar convertible with Ilex shutter – used in both configurations
Both shutters checked for operation and speed accuracy by 'Romanian' tester, and also checked that shutter worked by eye.
Copal as per setting on ‘speed ring’.
Ilex - Actual speeds determined at speed selector dial position.
Way out of speeds on dial, but reasonably consistent
Weston Reading 12 - 12.5 giving exposures of:- 1/8s@f11; 2s@f25; 1/10S@f8 and 1/2s@f22.
The four exposed sheets developed at same time in Jobo 2500 tank with 2504 sheet film holder.
Developed with ‘’Ilford PQ universal” using both old [2 ½ years old} and fresh concentrate [delivered yesterday opened today]
Dark slide removed before exposure.
Camera:- Calumet CC400
Any and all help welcome
regards
Tony
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