Shooting and developing Konica Infrared 750

[Sirius Glass]

I have nine rolls of Konica Infrared 750 in the freezer. What is the ISO, not EI, before adjusting for the filter? I have several different filters I can use: R23, R35, R29 and R720, so I am looking for the manufacturer's ISO.

Developing times in XTOL: stock, 1+1, replenished rotary [Jobo processor]. Tank development if that is all you have.
Developing times in Pyrocat HD in Glycol rotary [Jobo processor]. Tank development if that is all you have.

 

[Andrew O'Neill]

ISO 32

Xtol 1+1 BTZS tubes 8:00
Pyrocat-HD BTRZS tubes 8:30

 

[Sirius Glass]

Thank you!

The ISO 32 without filters is confusing.

Because f/5.6 @ 1/60 second is EV 11. Then uncorrect for the R25A filter is three steps, EV 11 12 13 14. And EV14 is f/16 @ 1/250 second for ISO 250.

So are my calculations wrong?

 

[Sirius Glass]

From Digital Truth http://www.mat.uc.pt/~rps/photos/FAQ_IR.html#KNBW

Konica IR750 R25 EI 10 Analog Gain -1.13, Xtol 1+1 @7 mins
Nice infrared rendition as photographers have come to know it - and from a R25 filter, no less! Using an Orange filter, a common practice for landscape photographers, would have been less pronounced (see my comments under Rollei EI R25 EI 50 Reference below). Poorer sharpness, same grain versus Rollei IR.

Konica IR750 R72 WI 8 Analog Gain - 1.3 (approx), Xtol 1+1 @7 mins
Surprisingly way too much contrast in negative for a film/developer combination I have standardized on in the past. A good example of why one would have to scan for the highlight detail and the let the shadows render as a detailess "lunar effect."

 

[glbeas]

I had great results in Technidol with an ei of 12 to 25, developed the same time as tech pan. It should do about as well in any other good pota formula.
Edit, this was with a deep red filter.

 

[BAC1967]

I love this film, I use it with a red filter at EV11. I usually use a camera that doesn’t have the IR compensation on the focus scale so I focus slightly in front of the subject and shoot at f/11 or f/16 to increase the DOF. Use a tripod and only shoot on a bright sunny day with the sun at your back. I’ve developed it in Rodinal and HC-110 with great results.

in this shot, despite the clouds I had the sun at my back and the tree was in bright sunlight. Developed in HC-110 dilution B.

Thunderstorm Over Zuni Mountains by Bryan Chernick, on Flickr

 

[Roseha]

I've used it with the Red 29 filter and like the results very much. Waiting for some greenery in the NY area though!

 

[Sirius Glass]

So what I am hearing is for Sunny 16:

R23 EV 12
R25 EV 11 f5.6 1/60
R29 EV 10
R720 EV 9​

Correct?

 

[Snowfire]

An interesting film. Last fall I shot a roll that had been lying around without any refrigeration forr 15+ years. My expectations were low, but other than some elevated base fog, it still had retained fairly full IR sensitivity and I actually got a couple of shots out of the roll. A pity that nothing like this is made any more.