Thanks for your replies, everyone! This is beginning to help and make more sense!
I have always used the box speed. Some cut the ISO by 1/3, 1/2. or 2/3 f/stop to get a denser negative or because they think that they will get more shadow detail. I suspect that many do it because:
- They do not know how to meter correctly and regularly take light readings of the sky.
- Their light meters, cameras or lenses need a CLA.
- They think they are smarter than the film manufacturer.
- They love to test and would rather test than actually take photographs.
- Some are Zonistas.
- They are compensating for not knowing what they are doing. Related to #1 though #4.
Sirius, you crack me up, and with this set of prejudices, you generate a lot more heat than light. Lots of us test our film for best results with different developers, etc. It's not a big deal. It was not invented by the Illuminati. The proof is in the final result, the print on the wall, and lots of people use lots of different approaches to get there.
I have always used the box speed. Some cut the ISO by 1/3, 1/2. or 2/3 f/stop to get a denser negative or because they think that they will get more shadow detail. [...]
I have always used the box speed. Some cut the ISO by 1/3, 1/2. or 2/3 f/stop to get a denser negative or because they think that they will get more shadow detail...[]...
I have always used the box speed. Some cut the ISO by 1/3, 1/2. or 2/3 f/stop to get a denser negative or because they think that they will get more shadow detail. I suspect that many do it because:
- They do not know how to meter correctly and regularly take light readings of the sky.
- Their light meters, cameras or lenses need a CLA.
- They think they are smarter than the film manufacturer.
- They love to test and would rather test than actually take photographs.
- Some are Zonistas.
- They are compensating for not knowing what they are doing. Related to #1 though #4.
I always shoot at box speed unless I consistently get incorrect exposures at that speed, I figure the film manufacturers know more than I do about their films.
I have always used the box speed. Some cut the ISO by 1/3, 1/2. or 2/3 f/stop to get a denser negative or because they think that they will get more shadow detail. I suspect that many do it because:
- They do not know how to meter correctly and regularly take light readings of the sky.
- Their light meters, cameras or lenses need a CLA.
- They think they are smarter than the film manufacturer.
- They love to test and would rather test than actually take photographs.
- Some are Zonistas.
- They are compensating for not knowing what they are doing. Related to #1 though #4.
I always shoot at box speed unless I consistently get incorrect exposures at that speed, I figure the film manufacturers know more than I do about their films.
To me, ISO is just a reference number for my film test. My EI slightly changes with contrast indexISO is measured at a fixed contrast index.
This is an old reference and not everything is correct, but it is interesting.
http://www.photomemorabilia.co.uk/Ilford/Film_Speeds_1960.html
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