Photographing at 160 iso with 100 iso film: what will be the results?

[Treymac]

Hey guys.
One of my camera's is slightly broken, it only lets me set the iso from between 125 and 160, and up to iso 400. So If I set my iso at around 145, using 100 speed film, what will be the results?

I know it'll be underexposed, but by how much, would I even notice?

Thanks.

 

[j-dogg]

I'm not sure, I suppose you could compensate by adding a stop of exposure. I'll wait for the pros to chime in on this one.

 

[MattKing]

Are you shooting print film or slides? Colour or Black and White?

 

[removed account4]

if it is slide film your film will be a tiny bit denser
if it is print film, you will barely notice, you have more leeway with print film.
but in both cases if you are not a perfectionist you might
not even notice, especially if a lab is printing them for you

you could always compensate as j-dogg suggests, but instead of a whole stop, make it a half stop.

good luck !
john

 

[Treymac]

Hey guys. I'm mostly going to be using B&W negative film for the first while with it.

 

[MattKing]

Add between 1/3 and 1/2 stop extra exposure and you will be fine.

 

[Treymac]

The camera is a completely automatic camear, the Olympus Trip 35, so I can't change the settings. I'm going to have to shoot at what the camera wants to based on the iso.

 

[hpulley]

You have a few choices. You can shoot at whatever ISO you can set and then you can develop or tell the lab to develop it at the speed you shot at. Most 100 ISO films can be pushed to 160 or 200 ISO without difficulty. Even if it is developed at 100 ISO there should be enough latitude to get decent prints at this small one stop underexposure.

Or you can shoot in manual flash mode on that camera without a flash to get some control. You only get 1/40th shutter and then you'd need to know what aperture you want and open up one more click stop. This may be more trouble than it is worth, A mode with 1/200th underexposing will likely give you better results.

 

[nworth]

For most shooting, there will not be much difference. You will lose some shadow detail, and that could be very important where shadow detail is important. If you can set the camera to 125, do so. The problems will be less. If you can set exposure compensation on your camera, set it to give 1/3 (for 125) or 2/3 (for 160) stop additional exposure.

 

[hoshisato]

For B&W, I sometimes shoot 100 ISO film at EI 160 when stand developing to avoid blowing out the highlights; maybe something to look into.

 

[Treymac]

For B&W, I sometimes shoot 100 ISO film at EI 160 when stand developing to avoid blowing out the highlights; maybe something to look into.

Just curious, what is stand developing?

 

[hpulley]

You just let the development tank stand and work slowly rather than agitating the tank (turning it upside down) at various times throughout development.