T-Max 3200 processing time exp at 1600

[Matt5791]

The Paterson Aculux says processing time of 16 mins for Tmax 3200.

I have exposed this film at 1600 - do I reduce the processing time?

Thanks,

Matt

 

[Kevin Caulfield]

The rough rule of thumb would be to reduce development time by about a quarter to a third for each stop. Try about 12 minutes.

 

[NikoSperi]

Never mind... in vino veritas not.

Some find the true speed slower than 3200. I don't. But you could process as usual, saying the true speed is closer to 1600 than 3200.

 

[Kevin Caulfield]

Wouldn't exposing it at 1600 be overexposing it? You would be giving it twice the exposure that you would for 3200?

 

[NikoSperi]

Wouldn't exposing it at 1600 be overexposing it? You would be giving it twice the exposure that you would for 3200?

Yes, of course. I had a champagne-induced brain cramp there before I edited... Sorry.

 

[Kevin Caulfield]

That's okay. I was nearly about to agree with you before I had a proper think about it.

 

[johnnywalker]

I suppose a lot depends on the developer you're using, but a lot of people (me included) find that exposing it at 1600 and developing for 3200 works well. I've usually developed it with DD-X.

 

[Matt5791]

OK, thanks for the replies everyone.

I went with the first suggestion which was:

Aculux for 12 minutes

I presoaked the film and fixed it twice.

The negs are sparkling and look really sharp!

(apart from the last 10 shots on the roll which had a little vignetting which looks like a camera problem. I can easily crop it out during printing without changing the composition of the print as it is only small, but irritating none the less)

Thanks for the help everyone!

Matt

 

[Kevin Caulfield]

Phew, I'm glad my suggestion worked! I only said ABOUT 12 minutes, but if the negs are sparkling and sharp then, well done.

 

[gnashings]

Phew, I'm glad my suggestion worked! I only said ABOUT 12 minutes, but if the negs are sparkling and sharp then, well done.

No, Kevin, no no no! All wrong! This is where you post:

"Hmm, yes, exactly as I have predicted. Hold my calls, I'll be on my mountain top!"

That's what I would have done, heheehehehee - you are waaaay too modest!

Peter.

 

[Lee L]

I'm glad you got good results. Testing is always the best way.

The following is from Kodak's tech info bulletin for P3200, and I had it posted at the front desk of the lab I used to work in. I feel that the P3200 designation is at best misleading for most developers, so I always throw this out when people start asking about EI ratings for P3200. So for what it's worth:

KODAK PROFESSIONAL T-MAX P3200 Film is specially designed to be used as a multi-speed film. The speed you use depends on your application; make tests to determine the appropriate speed.

The nominal speed is EI 1000 when the film is processed in KODAK PROFESSIONAL T-MAX Developer or KODAK PROFESSIONAL T-MAX RS Developer and Replenisher, or EI 800 when it is processed in other Kodak black-and-white developers. It was determined in a manner published in ISO standards. For ease in calculating exposure and for consistency with the commonly used scale of film-speed numbers, the nominal speed has been rounded to EI 800.

Lee