Tri-X at 125 EI?

[jpa66]

I mistakenly shot a roll of Tri-X at 125 EI. I had been shooting Plus-X, but since both films come in nearly identical packaging, and it was in my Rolleiflex ( and I had a momentary lapse of memory ), I thought that the Tri-X was Plus-X, hence the 125 EI rating.

The MDC recommends a development time of 7.5 minutes in Rodinal 1:50, if shot at EI 100. I planned on developing it in Rodianl, but am not sure that it will work out.

Does anyone have any experience shooting Tri-X at either 100 or 125? If so, I'd appreciate it if you let me know what developer and times you used, and what results that I can expect with them.

Thanks,
Jan

 

[Chriscrawfordphoto]

7.5 minutes is probably pretty close. I develop Tri-X in Rodinal for 8.5 minutes for EI-160, which gives N-1 development in zone system terms. Exposed at 100, and given a minute less would probably work well, but since its more of a pull then the N-1 time, expect fairly low contrast (which might not be bad if you shot on a harsh sunny day so long as you exposed enough for the shadowed areas...the bright areas will come down to normal densities because of the pulled developing). If the negs are too flat, print on grade 4 or 5 paper, or increase contrast in photoshop when you scan. They'll be fine.

 

[Freakscene]

I use Xtol 1+3 for 10 minuted for Tri-X at EI 100 - slightly less than the 10.75 min recommended by Kodak for "EI 100/200" when they still gave recommended times for 1+3 dilution. Gives about an N-2 in zone system terms.

Chris' experience and the fact that Rodinal gives relatively low speed at the best of times indicates that you will be fine with Rodinal.

Marty

 

[jpa66]

Thanks, gentlemen. I'm going to soup it in the Rodinal, so all should be well.

 

[alfredian]

Adjust the "second half"

Adjust the "second half"

I read this in one of my dusty photo-guides: to adjust developing times (push OR pull) you divide your "usual" developing time in half (by arithmetic) & ADD to this number your adjustment of the "second half". Calculate this by multiplying your half-time by your speed-ratio, in your case by 125/400.

You'll be using a bit over one-quarter of your "second half" - or one-eighth, added to the "first half."

The justification was that half-development gives you a "readable" highlight, and the rest is trading off electrons (developer) with photons (light).