lenshustle
Member
The theory isnt holding up very well well dropped to nuts and bolts.
1. the timer used by many, and that book chapter the fellows linked too, is a gralab 300. Officially only does whole seconds and minutes.
Dont see how i can do that ultra reliable and ultra repeatable 8.6 second exposure time.
2. Unless you use grain focusing, I dont see how it can beat a standard 2,4,6,8 etc exposure test.
2. Can the data actually correlate between different enlarging lenses?
light meter data in camera doesnt give the same shutter and aperture settings when i swap out my 75mm lens that liked f5@1/150, and put in my 75-200 focal length lens and set it to 75mm and f5.. different diameter. 75mm lens is 55mm thread and 75-200 is 63mm.
SO i dont honestly see the theory of creating a complicated f stop guide for length of exposure holding water when i do the initial base test with my 50mm enlarger lens, and then need to swap in my 90mm enlarger lens so i can do an 11x14 print.
YES i know in the real world of non f stop printing you would do a new test strip, however the claimed benefit of f stop printing is supposed to be built in abilty to simply multiply the f stop number by a magic number to give you the correct setting for the larger size print you want to make.
1. the timer used by many, and that book chapter the fellows linked too, is a gralab 300. Officially only does whole seconds and minutes.
Dont see how i can do that ultra reliable and ultra repeatable 8.6 second exposure time.
2. Unless you use grain focusing, I dont see how it can beat a standard 2,4,6,8 etc exposure test.
2. Can the data actually correlate between different enlarging lenses?
light meter data in camera doesnt give the same shutter and aperture settings when i swap out my 75mm lens that liked f5@1/150, and put in my 75-200 focal length lens and set it to 75mm and f5.. different diameter. 75mm lens is 55mm thread and 75-200 is 63mm.
SO i dont honestly see the theory of creating a complicated f stop guide for length of exposure holding water when i do the initial base test with my 50mm enlarger lens, and then need to swap in my 90mm enlarger lens so i can do an 11x14 print.
YES i know in the real world of non f stop printing you would do a new test strip, however the claimed benefit of f stop printing is supposed to be built in abilty to simply multiply the f stop number by a magic number to give you the correct setting for the larger size print you want to make.