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You dont need to use labels. Cant you just change the iso manually on the camera?
Posted 2 months ago.
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if it's traditional b&w shoot, the film at whatever speed you want, then tell the lab to process it (or process it yourself) at the speed you shot it at. simple as that, no need for dx labels.
same thing with c-41 and e6, but you'll need a pro lab that knows how to and is willing to perform pushes/pulls on their machines. it won't matter if you try to "trick" the lab by shooting iso 400 negative film at 1600 and giving it to them in an iso 1600 dx canister, it'll still be processed at 400 due to the standard processing times of all c-41 films. you'll end up with underdeveloped negs unless the processing time is extended.
Posted 2 months ago.
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you can't really push process xp2 - unless you ask the lab to process for longer. otherwise you are just underexposing. so first find out if you can get extended processing. Also, if you are after b&w, push traditional film, not c41 ones.
unless your camera requres that you use the DX code then you can just manually change the ISO setting on the camera. But if it does use the DX coding, see if you can set exposure compensation. Making it -2 for a 2 stop push, etc.
Posted 2 months ago.
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Just for clarification, shooting ASA 400 at EI 1600 is push (or underexpose) and at EI 100 is pull (or overexposing).
Posted 2 months ago.
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ah i've misundeerstood - i thought i could shoot 400 film at 100 (setting on my camera) the stick the DX labels on and get it processed as 1600 speed film. Have I been a numpty?!
x
Posted 2 months ago.
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i thought i could shoot 400 film at 100 (setting on my camera) the stick the DX labels on and get it processed as 1600 speed film.
not quite sure how you came to that conclusion but, no. you want to have film processed at the same speed it was shot, just like if you shoot iso 400 film at 400 (box speed) you process it at 400. so, if you shoot iso 400 film at 100, you have it processed as iso 100 film.
Just for clarification, shooting ASA 400 at EI 1600 is push (or underexpose) and at EI 100 is pull (or overexposing).
and just for a little more clarification, the underexposing/overexposing is done in camera. the pushing/pulling is done in developing. they are separate aspects, but go hand in hand for proper exposure. doing one without the other could leave you with negatives that are either too dense or too thin.
Posted 2 months ago.
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Oh well i've just gone plain mental then! So even if i shoot 400 at 100, then get some 100 labels t stick over, this wont work in a normal lab?
Posted 2 months ago.
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No, they'll just laugh at you. Or their own feet, or something.
Posted 2 months ago.
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Every C41-film is processed the same way whatever ISO it is, C41 is a standard process and the processing time is the same for all ISO's.
Originally posted 2 months ago.
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blpz edited this topic 2 months ago.
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Oh well - time to think up another way of experimenting!
Posted 2 months ago.
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ps - thanks all!
Posted 2 months ago.
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So even if i shoot 400 at 100, then get some 100 labels t stick over, this wont work in a normal lab?
with traditional b&w yes, because this would tell the lab what iso to process it as (you would probably also want to tell them what speed to process its, just to make sure they know).
but the first thing you have to understand about c-41 and e6 is that they are all standard times. here's an example:
superia 1600, superia 400 and superia 100 all go into the same machine to be processed in the same batch, at the same temperatures and for the same amount of time. no difference whatsoever in the processing between film speeds. so even though you put an iso 1600 dx label on the canister, it doesn't change the fact that you have iso 400 film in the canister. therefore, your iso 400 film goes in the machine, alongside the iso 100 and iso 1600 films to be processed at the same times and temperatures. it will only be developed long enough to develop shots exposed at iso 400, not iso 1600. to gain the extra 2 stops back, you need to have it processed for a longer amount of time, but most mini-labs won't do this because it deviates from the standard process of c-41.
make sense?
Posted 2 months ago.
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When developing traditional B&W film, lengthening the development time can partly compensate for less exposure--that's push processing. If you develop your own, it's easy to do.
It gets less clear when you're talking about C-41 negative processing (all color neg and a couple of B&W neg films). Most minilabs do not have the ability to change the development time for an individual roll--the strips go through a roller feed machine giving standardized development.
A very small number of pro-oriented labs are able to do true push-processing of C-41. But you have to be *very clear* with the staff what you want--they will not change the development time just based on a bogus DX sticker. They generally charge extra for push processing due to the special handling.
Posted 2 months ago.
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