I finally, *finally* found my Calumet shutter speed tester. I tested some lenses and noticed that the shutter speed decimal equivalents on the label are wrong. It begins okay (1=1.000, 1/2=0.500, 1/4=0.250, 1/8=0.125) but then the label diverges and sets 1/15 to 0.0625, which is of course 1/16; likewise for 1/30 and 1/60 Calumet gives the decimals for 1/32 and 1/64 etc.:
shutter setting___actual decimal___Calumet decimal
1 sec___________1.00000_______1.00000
1/2____________0.50000________0.50000
1/4____________0.25000________0.25000
1/8____________0.12500________0.12500
1/15___________0.06667________0.06250
1/30___________0.03333________0.03125
1/60___________0.01667________0.01563
1/125__________0.00800________0.00781
1/250__________0.00400________0.00391
Am I missing something?
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