Starting point for Arista EDU Ultra, 4X5

[Rich Ullsmith]

Shot a dozen pinholes yesterday with this new film. Used my basic sunny 16 exposure that always seemed to work with Tmax 100. Looking at the massive charts, the development times for EDU Ultra seems short or concentration seems high.

For Rodinal, 1+50 for 7m, 20c. I have never developed a film in Rodinal that required less than 10m.
For PMK, 1+2+50 for 10m, 20c. Standard dilution for almost all films is 1+2+100, for 10 to 15m.

Any experience here with this film and these developers? My understanding is EDU Ultra has a pretty wide latitude for exposure and development. Just wondering if these are reasonable starting points. I plan on developing in 3 batches in order to titrate, but still would rather get something printable out of the first batch.

 

[Barry S]

I've used Pyrocat HD with the 100 and 200 speed Foma films, and the density builds quickly. The developing time is significantly shorter than any of the other films I regularly use (mostly t-grain).

 

[Rick A]

While I shoot boat loads of it in my 4x5 and soup in PMK Pyro(outstanding combo) I don;t recommend it for pinhole work, it has probably the worst reciprosity failure of any film. That's not to say not to use it, but you need to understand it and account for it in your testing. I tried it in Rodinal, didn't care for it, and occasionally use D-76 1+1 which is IMO a good combo.

 

[Gadfly_71]

You haven't mentioned which speed Arista you're using. I've been using 200 at box speed and souping in Pyrocat HD 2:2:100 (68f) for 10 min (constant agitation). I probably need to adjust a little bit as I'm getting some super thick negatives.

Here's a sample:

 

[Rich Ullsmith]

Okay, density builds quickly. That would account for the 7m in rodinal. But then the double concentration of PMK would suggest otherwise. Well, I can either wring my hands or go in the darkroom. I'll go with the PMK as I probably don't have enough Rodinal for three batches anyway. Report back later.

 

[Rich Ullsmith]

Ah, speed. With Acros or Tmax100 I always exposed for 90s on bright sunny days. 10-15m in PMK or Rodinal always got me in the ballpark. I'm at f215 to f275, with a red 25 filter on all of them, if you were wondering about the long exposures.

 

[Barry S]

Ah, speed. With Acros or Tmax100 I always exposed for 90s on bright sunny days. 10-15m in PMK or Rodinal always got me in the ballpark. I'm at f215 to f275, with a red 25 filter on all of them, if you were wondering about the long exposures.

The reciprocity failure is vicious. If you're metering at 90 seconds, that exposure becomes 20-25 minutes with Fomapan 100.

 

[Rich Ullsmith]

Well, PMK for 13m 1+2+100 at 75f looks to me not much different than Tmax or Acros. Next time maybe add 1/2 stop exposure and cut development maybe to 10m, but these negs are printable. Try to put something up tonight.

No, I am not metering at 90s. My cameras range from f215 to f275, so starting with sunny 16 at 1/100s and walking it up to f250 (I just assume f250 because 4 cameras are exactly f250 and the others are not far off) then add in 2 1/2 stops for the red filters, that comes to about 15s exposure, then reciprocity would take it up to about 2m 10s. 2m 10s with less development would have been better. I'll put some stuff up tonight.

 

[Rick A]

According to Foma's spec sheet, you need to add 3 stops exposure for 10 second exposure, and 4 stops for 100 seconds.

 

[Joe VanCleave]

The reciprocity failure is vicious. If you're metering at 90 seconds, that exposure becomes 20-25 minutes with Fomapan 100.

When you get into these kinds of exposure times with film, that's when paper negatives start to look attractive. I know; apples and oranges, being as the two have different tonal renditions and color sensitivities; and traditional printing with paper is usually limited to contact printing (unless you have a reflection enlarger).

But my typical F/300-ish pinhole camera, with Arista grade 2 paper, exposes normally in about 45 seconds to a minute in bright sun. I've made exposures in cloudy conditions over 5 minutes in length with paper, and had normal exposures without applying reciprocity compensation.

~Joe

 

[wblynch]

Foma 100 develops fast. I like to use HC-110 dilution H (1+63) to lengthen the developing time since I'm not so accurate.

Dying to get a 4x5 to start shooting some of the film I have.