Use Film at Lowest ASA For Extented Exposure Time

[Mustafa Umut Sarac]

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I am thinking to expose and develop 50asa pan f plus film as 1 asa film for to increase the exposure time. What kind of change on images happens  , any example?

thanks,

umut

istanbul

 

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[stray cat]

Hi, I have very little idea what will happen if you overexpose by so much (5.5 stops?). I do know that you would need to work out an appropriate time to underdevelop the film in whatever chemistry you use. I'd probably, in that case, recommend stand developing which you can look up about online.

You WILL get negatives with very little contrast so I'd bear that in mind.

An interesting concept, and it will be very interesting if you feel like sharing your experiences here.

Best of luck!

[Pyrogallol]

Pan F is a contrasty slow speed film. I imagine if you overexposed five stops and under developed you would just get dense flat negatives. If you under develop too much you would just get flat thin negatives.

If you want to try using long exposure times perhaps do what digital camera users do and put a neutral density filter on the front.

[250swb]

Yes you need a three or four stop neutral density filter, you will keep the film's characteristics but gain long exposure times. You'll probably need a hand held meter. You will also have to factor in the reciprocity of the film, when over 1 second or more exposure is indicated the exposure needs to be increased by ascending amount of time. So if the meter reads 2 seconds of exposure you need to give it 4 seconds and so on ( 8 seconds is doubled to 16 seconds, etc.) until around 20 seconds by which point you may need to give it more than double. It varies with every film but you have to do it or you will have underexposed negatives. You will however be able to process your film normally.

But vastly over exposing the film by as much as five stops then trying to compensate in development isn't going to work.

Edited March 4, 2022 by 250swb