OLD Efke IR 820 film advice needed

[Wolfram Malukker]

I have six rolls of 135 format Maco IR820C, which I believe is the same film. Mine expired in 2008, and is listed as an ISO100 film. I figure it's probably either fine at 100, or needs to be shot at 50ISO, plus compensation for the Zomei 720nm filter, which I have seen recommended at 4 to 5 stops when used with Aviphot 200 based films (and I have used at 5 stops, and it seemed to vary between OK and overexposed, but I was still metering at 200).

I'll be getting it out again this spring and summer, so this thread is very timely for me!

EDIT: Here's a link to Tim Gray's excellent repository of film datasheets:

https://125px.com/docs/film/maco/MACO_IR820c_AURA.pdf

 

[moofy]

Lately I managed to come into a 5x4 box of Kodak EIR & Efke 820.

I have a glass R72 & a slightly manhandled polyester Lee 87 filter (the result of an experiment with trying to make an infrared flash, slightly underestimated the output of my Metz head and slightly burnt the shape of it into the plastic… ) and I’m wondering what a rough speed to use the Efke would be with the different filters. Will an 87 even be worth it with it with the even longer exposure times?

The suggestion of using ISO 25 and compensating 5 stops for an r72 is confusing me, I thought this film was nominally ISO 100, as per the information I found here: https://www.freestylephoto.com/pdf/product_pdfs/efkefotokemika/EfkeIR.pdf

I assume I’ll also have to compensate with bellows draw, how should I judge how much to rack in? Would focusing with a red filter and stopping down be worth a try to get close while still visible?

 

[blee1996]

I used expired Efke 820 last time in 2024, and this film does not age well. With R72 filter, I used ISO 6, and my negatives has hardly any image registered. From the same day fresh Rollei 400 worked well. Hope you are more lucky than I do. I will probably start with ISO 3 and go bracket lower ISO.

 

[Andrew O'Neill]

Mine has always been freezer stored. No issues when I last shot a couple sheets a couple years ago... I believe I exposed it at EI 3, with a 720 Zomei filter.

 

[romosoho]

It's a long shot but has anyone developed IR820 in F76+? I find 14:00 with 1+9 in the MDC, at EI 100, but figured I'd ask. I have 2 bricks of 120 in the freezer (I used to buy IR film whenever possible, and just recently completed using up HIE and Konica 750. Now it's onto Efke).

 

[Andrew O'Neill]

That person should have indicated in the MDC notes, if that EI is with or without a filter, and if with, which one... Are you planning on using a 720 filter?