Changing ISO Speed in the Middle of a Roll

[tgray]

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For 'proper' exposure, you probably shouldn't. However, if you are only scanning and never wet printing, you can get away with quite a bit, even if you aren't using a compensating developer. You can do the same if you wet print, but you've only got so many contrast grades to play with and it could be difficult to make a satisfactory print.

 

The above goes for good quality negative film over a reasonable exposure range. You can easily go 1 or 2 stops over metered exposure and get a reasonably good print/scan in my experience. One stop under is usually fine, but 2 stops under can be a bit much, depending on the film. This goes for color or B&W. Of course, if you underexpose, you're going to lose shadow detail, and if you overexpose, you run the risk of blocked up highlights or increasing grain. Note, things will look better with the proper exposure.

 

Of course, if you shot your whole roll at a different EI, pulling or pushing your film by adjusting your development time can make things easier to print/scan, requiring less adjustment. You can also do some things like expanding the dynamic range of the scene you capture by pulling a film by two stops, etc.

[minhhich]

What i normally do with my camera is to carry 2 rolls of films withdifferent speed. This also apply to when you want to switch between colour and black and white film. When you want to change speed or to different type of film just rewind the film and make sure to leave the tip out then load the other roll in. This take time but will result much better.

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