Iso/asa

A

all3nizzle

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just a question regarding this

if i use kodak 400 film and the setting on my camera (yashica mg-1) is not on 400, how would that affect the photos?

thanks guysss
 
For example, if you rate a ISO400 film ISO100 on camera, and develop it as ISO400, you photo will be overexposed by 2 stops. If shot at ISO800 and develop at ISO400, then 1 stop underexposed.

How bad it will look will depend on which side (over or under) it shifted, and kind of film you used (BW? Color Neg? Slide?)

For example, 1 stop overexposed in b/w won't be much of problem in real world.

I often push 400 b/w film to 1600. This means you use 400 speed film but shoot as if you have iso1600 film, and develop as 1600 speed instead of 400 "recommended" sensitivity by the manufacture. If you bring your film to a photo lab or develop yourself, you can either push or pull (rate at lower speed), but this won't work on color negs.
 
all3nizzle said:
say it was on 200, 500, or any other number
would a higher speed mean anything?
Click to expand...

It sounds like you have exposed some film at the wrong ISO/ASA. All of us have done that at least once, usually more often.

If that is the case, why don't you tell what film, what its rated ISO is, and what you exposed it at. That will make it easier to answer correctly and specifically.

If you are just asking hypothetically, about push or pull processing, then basically, b/w is more forgiving, color not so much. Slides can be pushed, but the more you do the less good they will look. They can be pushed up to two stops. Color negative, at least in my experience, prefer to be over exposed if not spot on, don't like under exposure, and don't like to be pushed much.

But if you have done that let us know. Even poor photos may be better than no photos, depending on what/who you were shooting.
 
If you set your ASA/ISO to a lower value, you will overexpose as the camera thinks you are using a lower sensitivity film than you actually do; if to a higher value you will underexpose since you have told your camera-metering process in error that your film is more sensitive.

Of course I assume here that your lightmeter is still perfectly on and your film is as rated on the box.
 
Not to steal the OP's thunder, but I have a question that's sort of similar to this and I didn't want to post a thread.

If I'm using 400 speed film and my camera's shutter speeds are B, 25, 50, 100, 250, and 500, assuming a sunny day with my aperture set at f/16, what would I have to set the shutter speed to? 500 and push process? 100 and pull?
 
Yikes! In the shade, backlit, white cat in a snow storm? These variables make a difference you know. If you set your aperture between 11 and 16 and your shutter speed to 1/500, then stand you subjects in midday sun - have them squinting into it - and shoot, your negatives should be exposed about right if you started with iso 400 film.

If you started with asa 400 film, give it more exposure, because it is WAY out of date!
 
Negative said:
Not to steal the OP's thunder, but I have a question that's sort of similar to this and I didn't want to post a thread.

If I'm using 400 speed film and my camera's shutter speeds are B, 25, 50, 100, 250, and 500, assuming a sunny day with my aperture set at f/16, what would I have to set the shutter speed to? 500 and push process? 100 and pull?
Click to expand...

With neg film, 1/250 and no piddling around with 'push' or 'pull'. Photography just isn't that precise. At worst you're likely to be overexposing 2/3 stop. In the real world, with most camera meters, you'll be very close to the corect exposure.

Cheers,

R.
 
Negative said:
If I'm using 400 speed film and my camera's shutter speeds are B, 25, 50, 100, 250, and 500, assuming a sunny day with my aperture set at f/16, what would I have to set the shutter speed to? 500 and push process? 100 and pull?
Click to expand...
We'll if your subject is lit by the sun, and the camera has a mechanical shutter then F16 @ 1/500 (since the shutter is probably a little slow anyway). B&W or Color negative film is pretty forgiving.
 
Beemermark said:
We'll if your subject is lit by the sun, and the camera has a mechanical shutter then F16 @ 1/500 (since the shutter is probably a little slow anyway). B&W or Color negative film is pretty forgiving.
Click to expand...

Very true but 'sunny 11-1/2' or 'sunny 11' often gives better results anyway.

Cheers,

R.
 
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