Help

[Palin0_0]

Hi everybody, I need some help regarding old tx film.....in order to exposing the film you should shoot it at lower iso, if so how many steps?...... pls advise

 

[Ricardo_Fon]

How old is it? Any idea how it was stored?

 

[Overrank]

Hi everybody, I need some help regarding old tx film.....in order to exposing the film you should shoot it at lower iso, if so how many steps?...... pls advise

The rule of thumb with colour negative (C41) film is one extra stop for every 10 years. When I got a lot of 126 Instamatic film I did some tests on one cassette, and measured what was the best compensation (it turned out to be 2 stops and it was around 20 years old). I’ve done similar for APS and normally give that an extra stop (as it’s around 10 years old). But for some slightly out of date 35mm I tested it and it was Ok at box speed.

So really, if you’ve got lots of film run some test shots with a single roll at different exposures. If you’ve only got one roll then one extra stop per decade for colour neg, but not for colour slide film. And black and white tends to age better.

A couple of stops extra will probably do no harm - these were 5 - 7 stops overexposed by accident https://www.dpreview.com/forums/post/64603630

 

[Palin0_0]

About 15 years old......and not sure how it was stored.......it is B&W Kodak Tri X pan iso 100

 

[Palin0_0]

thanks for the answer.....it is
B&W kodak tri x pan iso 100 in 120 format....and it is about 15 years....no sure how it was stored....

 

[davesurrey]

As Overrank has said there is a general rule of thumb " one stop for ever decade" but that tends to work best for colour negatives.

Other suggest using box speed for B&W.

As a compromise and as you don't know the condition in which it has been stored I suggest you adjust by one stop if it's 15 years old.

 

[Palin0_0]

thanks......now I try to be sure it is iso 100.......nowhere in the package is any indication....

 

[AlbertTheLazy]

Tri-X is ISO 400. If the pack is old enough it might be shown as ASA400 or DIN 27.

 

[Palin0_0]

Thanks.....I was not certain....... if I shoot it at iso 200 would be ok then....

 

[davesurrey]

It's difficult to tell as the conditions in which it has been stored are unknown but I'd give it a try at ISO 200.

 

[Tomm111]

When I started film again I found in the same box the remains of a 100 ft roll of TMax100 from 1997 and a couple of rolls of 120 TMax400, 2002, also a couple of rolls of Ektachrome 100 120 also 2002.

I used them all at box speed to test, the TMax100 was fine, used several rolls, what was left of the roll. The TMax 400 had significant fog, the Ektachrome black density was low other colors were OK.

TriX is a relatively stable film, lots of folks use it at 200 as a normal speed. That considered I would start there as you were thinking.