IFF duogon focusing on floor issue

[fazadaoc]

Hello everyone,
I recently acquired an old iff duogon.
It has a 50mm and an 80mm (odd choice but it is how it is)
I am still on the cleanup and testing stages but I noticed I cannot focus the negative if I turn the column and project on the floor.

I assume this is because it'd need the lens to be closer to the negative?

The autofocus works quite OK and there's room to manually adjust focus.

I plan on trying to put a 105mm in order to print 6x9. I'll have to copy the lens panel (I have a 3d printer).

I cannot find any information about this model online, if anyone is familiar with it or has access to a manual it'd be much appreciated.

Thanks in advance!

 

[koraks]

Often if you fail to produce a focused image with a short lens, the problem is indeed that the lens doesn't get close enough to the negative. Depending on the enlarger you may need something like a recessed lens board. I'm not familiar with this particular lens or the enlarger you're using (IDK what enlarger it is in fact).

PS: it helps if you provide complete information (such as enlarger type used) and a clear description of the question in the thread title (e.g. "focus issue with IFF Duogon enlarging lens on xxx enlarger")

 

[Ian C]

You can get better answers if you provide the specific brands and models of the enlarging lenses that you are using.

If we know this information, we can likely find the flange distances of the lenses. Then, by specifying the film format you're using, and the required image size ranges needed, we can calculate the flange-to-film distance ranges needed.

I learned that IFF = Industria Fototecnica Firenze was a maker of photographic lighting systems and enlargers in Firenze (Florence) Italy.

https://it.wikipedia.org/wiki/I.F.F._-_Industria_Fototecnica_Firenze