Maco Genius 5x4 film ISO 400

[Geopadi2]

I have just bought some of this expired film on ebay probably quite a few years old, I don't know when it went out of production, so wondered if anyone with experience with this film has any advice on exposure and development of it.
I was thinking of rating it at 100 or 200 ? and developing in HC110 with maybe a minute extra time, but over what starting time for this film/developer?
I also have Xtol, Microphen, Pyrocat HD, Hypercat, 510 pyro, Rodinal but I read that HC110 may be the best choice for reduction of base fog but what about adding potassium bromide or Benzotriazole to any of these developers if standard development has too much base fog.

Any suggestions will be appreciated

 

[pdeeh]

wasn't this a special-purpose film rather like a lith film?

I think the "400" refers to a "paper speed", but actually very slow in film terms and very contrasty.

 

[Geopadi2]

Hi, Yes I think it may be a lith film from what little I can find about it !
So if 400 is a paper speed as you say I better rate it at 25 or less?, I don't know anything about lith, so more research needed!
Thanks for that, my rating of 200 would be a little on the thin side!

 

[pdeeh]

The usual advice for lith film (if you're after continuous tone) is to use a very dilute paper developer, although the rationale for doing so is invariably absent.

I've been messing about with Arista lith film and managed to get decent-ish continuous-tone negatives by exposing as low as EI1½ and developing in very dilute D23.

With a bit of luck someone will come along who has actually used this stuff to advise you, but otherwise you'll have to do your own testing (although as it's possible you'll be on your own after march 2016, you probably don't mind )

 

[Geopadi2]

Thanks for that, wow that's slow film, I will do some tests rating it at ISO 6 and see what happens from there also D23 is easy to make up so I may give it a try.
BTW I will be voting No

 

[AgX]

Where did you get this ISO 400 Information from?
I only know it as ISO 25. Or there may have been different materials, though not likely.

 

[paul_c5x4]

Data sheet available: http://www.maco-photo.de/files/images/TA_Genius_Printfilm_eng.pdf - One to bookmark as I have a couple of boxes sitting in the freezer.

 

[Geopadi2]

I havent actually recieved it in post yet - that was what the seller said!

 

[Geopadi2]

Thanks for the data sheet link - thats brilliant, the best starting point for sure