A question regarding Stand development

[Fred72]

Hi!
At the moment im using the combo Tri-x 400 and rodinal 1:200, and stand developing for 2 hours.I really love that combo i develops soo beautyfully! I have what might be a little noobish question: Say i change the film to one with a lower speed, say for instance a ISO 100 or even a ISO 50. In what direction would i change the development time with the same dilution?
Thanks in advance!
Best regards
/Fredrik

 

[Schlapp]

As I understand it, you look at the tank standing there once or twice and wonder what's happening inside. Then, when you remember about it 2 hours later, you find out

 

[df cardwell]

I think that's about right.

 

[Fred72]

As I understand it, you look at the tank standing there once or twice and wonder what's happening inside. Then, when you remember about it 2 hours later, you find out

Haha, ive put around 10 rolls through the process sofar, so i pretty much know the result with Tri-x 400 =) But sure, i sometimes get that feeling... but til this day i still havent fallen for the urge to just rip the container open to have a look =)

 

[Fred72]

I think that's about right.

So u mean i dont need to change the time? I still have it in for 2 hours?

 

[Fred72]

Chances are good that your developer is exhausting before the two hours is up, which could be considered development to exhaustion, in which case, the dilution will have more influence than the time of development.

Jay

So, if i understand this correctly. The developer will exhaust sooner with a lower ISO film?

 

[Ole]

Use the same time. I've done 100 and 400 ISO film together in the same tank (90 minutes, FX-2 at half strength). Both came out fine. Just remember not to agitate!

 

[Fred72]

Use the same time. I've done 100 and 400 ISO film together in the same tank (90 minutes, FX-2 at half strength). Both came out fine. Just remember not to agitate!

Mange Takk! Ole ;-) Did i spell that correctly in norwegian?

 

[waynecrider]

What I mean is that if the developer is exhausted at 90 minutes, extending development will not increase contrast, but a more concentrated developer will. If you want to use a constant development time of 2 hours for all films, you can control contrast by developer concentration.

Jay

Thanks for this info Jay, but what about a temp effect?

 

[Donald Qualls]

Higher temp speeds the reaction -- so the developer exhausts faster, but you get more development in that time; developing to exhaustion is the same regardless how fast or slow temperature makes it (as long as your chosen time is beyond exhaustion time). Changing the concentration changes the rate of development, but also changes the exhaustion time (by providing more developing agent). The same is probably also true of changing the amount of solution relative to the film area, as (for instance) in changing from 35 mm to 120 on stainless reels, where it takes about twice as much liquid to cover the same area of film. The 120 would be expected to develop to higher contrast in that case.

 

[pauldc]

I am very interested in the methods described here - is there absolutely no agitation during the 2 hours or do you agitate during the first minute before letting the tank stand?

Best wishes

 

[Fred72]

What I mean is that if the developer is exhausted at 90 minutes, extending development will not increase contrast, but a more concentrated developer will. If you want to use a constant development time of 2 hours for all films, you can control contrast by developer concentration.

Jay

Ah i see, let me try again and see if i understand this correctly. Normaly if i were to develop a lower ISO film i would lenghthen the time in the developer, but since the small ammount of developer i use, it probably would be exhausted after 2 hours. Therefore i should make a stronger dillution and shorten the time instead? How much stronger are we talking here? Sorry for the silly questions, but im rather new to this and with everyone goin digital, one are not exactly swamped with info regarding the fine and enjoyable craft of analoge development and printing.
Thx for all the help so far!
/Fredrik

 

[Fred72]

I am very interested in the methods described here - is there absolutely no agitation during the 2 hours or do you agitate during the first minute before letting the tank stand?

Best wishes

I Agitate only during the first 30 sec, then give it a good whack in the table or with your hand to remove any bubbles. After that u let it stand til the 2 hours are up.

 

[timeUnit]

Fredrik,

I think they are saying: Shoot a roll of what you want to try. Use the same developer dilution, agitation, temperature and time. See what you get. Thin negs? Less diluted developer, everything else the same. Thick negs? More diluted.

 

[Fred72]

Fredrik,

I think they are saying: Shoot a roll of what you want to try. Use the same developer dilution, agitation, temperature and time. See what you get. Thin negs? Less diluted developer, everything else the same. Thick negs? More diluted.

Thanks for clearing that up I guess ill try that. Time to load up the camera then, and get shooting. =)

Thanks again all of you for your info!
/Fredrik