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

 

[MARTIE]

I'm guessing it's a condenser enlarger and you'll need to have the correct condenser setup for each lens/format.

 

[grunf]

The IFF Duogon has a dual cam autofocus system, you must use only the two lenses it was set up at the factory in order to get the autofocus working. And it will work only if you project on its base. To project on the floor you must use the acccessory manual focus screw that raises the lens closer to the negative. You need that accessory also if want to print 6x9 and also need the right condenser for the 105 lens. I think with 6x9 and a 105 lens you can get a quite big picture in manual focus but I never tested how big you can go, for my needs the 50x60 cm that I can print on its base with my 100 lens is more than enough.