I just shot a 25 year old roll of expired Kodak Ektachrome P800/1600 film (reversal). I've shot a bit of expired film but never slide film and I'm just curious how I should get it developed.
Knowing that it would be less sensitive (it was not stored in a cool place), I decided to shoot at a lower ISO. The roll has 4 options and says to circle which speed you used: 400 - E-6, 800 - P1, 1600 - P2 and 3200 - P3. I stupidly didn't pay attention to that when I put it in and thought it was 200 for some reason, so I shot it at 100 ISO.
My question is, if I got it developed like it is 400, would my compensation for the degraded sensitivity be adequate or too much? In other words, should I get it developed at 400 or pull it to 200??
Also, I shot it expecting to not be able to get it processed "properly" and only get it cross processed. Since then, I found a place that does slide film developing, so now I'm not sure what I want to do. I'm open to doing either and mostly just want photos that aren't a washed out mess or underexposed garbage!
I'm still figuring out expired film and push/pull techniques, so excuse me if that was confusing. Would appreciate any insight or suggestions into what to do. Thanks!!