Efke IR820 Dev Times with Pyro Developers

Tumbles

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I've decided to start shooting my stockpile of Efke IR820. I'm wondering if anyone has dev times for Pyrocat and/or Obsidian Aqua along with an agitation procedure? I looking for something I can use with a regular Paterson tank, rather than a rotary processor. With my limited supply I really don't want to end up sacrificing some rolls for trial and error.

This guys stuff is what sold me on these combinations:
https://www.flickr.com/photos/mat4226/albums/72157629752474613

I think the dilution of 2:2:100 that he lists suggest that his times are for rotary processing. I wish people would post the agitation procedure more often with the times for Pyrocat. It's hard to tell if they're for rotary, regular or minimal agitation.

I didn't see any times listed for Obsidian Aqua.
 

Andrew O'Neill

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I've always used 1+1+100. 9:30. 21C. EI 6. Continuous agitation in BTZS tubes. I also have reciprocity data that I generated for this film years ago...
 

JensH

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Andrew O'Neill said:
I've always used 1+1+100. 9:30. 21C. EI 6. Continuous agitation in BTZS tubes. I also have reciprocity data that I generated for this film years ago...
Click to expand...

Hi,

exposed my last three 120 rolls of IR820 last month...
It needed quite a lot of Schwarzschild compensation, I used
1 stop for 1 sec,
2 stops for 10 sec,
3 stops for 100 sec.
Were your's similar?

It lookes very nice with my Pyrocat (the Windisch formula, similar to Obsidian Aqua...)
E.I. was only 1 due to the narrow 780nm band pass filter I took.

Best
Jens
 
Last edited:

Andrew O'Neill

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1 sec metred I only give 1/3rd stop more exposure.
10 sec = 3x more or 1 2/3rd stops more
100 sec = 12x more or 3 2/3rd stops more
 

JensH

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Andrew O'Neill said:
1 sec metred I only give 1/3rd stop more exposure.
10 sec = 3x more or 1 2/3rd stops more
100 sec = 12x more or 3 2/3rd stops more
Click to expand...

Ah, I see - thanks Andrew.
I should have bought more of this great film...
 

Andrew O'Neill

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Jens Hallfeldt said:
Ah, I see - thanks Andrew.
I should have bought more of this great film...
Click to expand...

I know, right??!! I have one, 8x10 sheet left... ONE! But at least I have a 50 sheet box of 4x5 in the freezer. I'll keep it there until next Summer... I also have about 75 sheets of Rollei IR. Not as IR sensitive as Efke, but at least grain is sharp and fine.
 
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OP

Tumbles

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So, 9:30 with continuous agitation at 21C. That should translate to around 12:22 at 20C with standard agitation: continuous inversions the first minute, and then 3 or so inversions every minute. This is what I got out of the massive dev chart temp/time converter. I'm not sure if this is the best way to figure this out.

I've always shot this film at ISO 0.75 with a 720nm filter. The first time I used it, I tried ISO 6 and hardly anything showed up on the negatives.

These are the times I have written down for the reciprocity failure:

0:01 = 0:02
0:02 = 0:04
0:04 = 0:08
0:08 = 0:24
0:15 = 1:00
0:30 = 3:00
1:00 = 8:00
 

JensH

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The famous last sheet! Here only 12 sheets of HSIR in 4x5" (waiting for the perfect use) and some SFX200 in 120.
 
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