[HELP] Efke IR 820 and d-23... what is the "FORMULA"?

[Enrico_Agostoni]

Dear "analogic" friends,

Yesterday I bought an Efke IR 820 for my Pentax 6x7. For infrared photos I use an 600nm filter (and not a "classic" 720nm like Hoya IR72).

So, according to the datasheet I have to expose my Efke to 6 or 9 ISO. (With the 720nm filter, the recommended exposure is at 3 ISO).

I like develop my film with the Kodak D-23. But... with this Efke, I haven't found information about times and/or diluitions.

Please.... can you help a "young" photographer?

Thanks,

Enrico.

P.S.
Apologies for my English.

[Keith Tapscott.]

Use the same time given for Kodak D-76 or Ilford ID-11.

[MDR]

Enrico I'd add a minute to the D76 times, 1 - 2 minutes longer dev. times than D76 seems to be the norm with D23.

Buona fortuna
Dominik

[Enrico_Agostoni]

Enrico I'd add a minute to the D76 times, 1 - 2 minutes longer dev. times than D76 seems to be the norm with D23.

Buona fortuna
Dominik

Grazie Dominik!

So, for D76 stock, the time is 8/9 minutes, therefore The time of D-23 is 10/11 minutes. (stock diluition).

Any suggestion for a dilution 1+3? maybe 20 minutes or more?

Thanks!

[MDR]

Enrico I found this info on using Efke 820c with D23 1+3 Dilution online just follow the link http://filmdev.org/recipe/show/5976

Dominik