Thanks Rob,
I guess that th lens you are refering to is this one
The Schneider 90/4.5 Apo-Componon HM is an enlarging lens that I happen to have lying around from my film days. I remembered it as a great enlarging lens. I wondered how it would perform in a completely different role: as a camera lens. This is asking the lens to perform well outside of its comfort
blog.kasson.com
It looks like it is the better option for my needs.
I wonder what is the menainhg and differences between the -S and -HM label in the componon lenses, because the price on the used market between -S and -M varies greatly.
The 90mm componon HM is about 500 Euros used, here in Europe, while the 80mm componon S is more like 150 Euros…
And since we are talking about enlarging lenses, also this is now a bit of the 80mm topic, I see there are also 40 and 45 mm componon HM lenses.
Any experience with one of those lesn? Would they fit on an Actus with a Fuji GFX and focus at infinity?
Cheers
Vvince
Vince,
The Componon-S was the "next to the best" line for Schneider-Kreuznach. Their top of the line is Componon HM. Having said that, they clearly thought that the 80mm Componon-S was a darn good lens because they turned it into their "Apo Digitar". Notice how all of a sudden it became an "Apo" lens...
As an Apo-Digitar, you can get it in Copal 0 thread with a Copal 0 shutter, and Copal 0 thread on an "iris mount", which has an aperture but not shutter. I do not love the Apo-Digitar iris mount aperture blades, but that's a personal preference. The mount itself is very nice to use.
This 80mm lens is also available in the industrial mount called "Makro-Iris". I really like this mount style because it's all metal, incredibly flexible in terms of mount options (can be adapted to both 39mm x 1/26th and M42x1 with an inexpensive adapter that locks onto the BV mount). It also works with the whole Schneider UNIFOC system of tubes and helicoids. The only wrinkle is that instead of f-numbers, you get integers from 1 to the smallest possible aperture, so you just have to remember that "1" on the aperture ring is f/4, 2 is f/5.6, etc.
The Apo Componon HM 90mm f/4.5 enlarger lens that Jim Kasson uses has the standard 39mm x 1/26th inch thread and plastic body. This particular lens is also available as the Apo Digitar 90/4.5, in Copal 0 with Copal shutter, and Copal 0 thread with the Schneider Kreuznach "iris mount". Like the 80mm, it's also available in the Makro-Iris industrial mount that I prefer. To make things more complicated, it's available in several very slightly different optical formulations in the Makro-Iris mount, each tweaked for a slightly different magnification. So while Jim and I both have the lens, we actually have slightly different lenses because mine is one model and his another. Mine is the one labelled Type -0024. It's a superb general purpose lens that does very well for close up. I haven't tested it for true macro.
Fun fact about this lens: the optical parameters in Schneider's data sheets for the Apo-DIgitar 90/4.5 and the Apo-Componon HM 90/4.5 are absolutely identical. This suggests the lens Jim is using -- the enlarger version -- is the same lens as the Apo-Digitar; I would expect minor coating differences, but that's about it.
My advice: if you have the budget, get the 90mm because it's a bit better, and get it in whatever mount you think you'll prefer -- Copal shutter, plastic enlarger, metal for Digitar, or Makro-Iris. If funds are tight, get the 80mm in whatever flavour you prefer, and just don't expect it to be great at f/4. I think I've shared this link before but here you can find long distance images at all apertures for both the 80mm (Apo-Digitar version) and 90mm (Apo-Componon HM version) lenses:
https://drive.google.com/drive/folders/1mIInzlyRvnMKS-MLOEdVjwX5gkNY3Xqn?usp=sharing
The Makro-Iris mount also only has 5 blades, but they're curved much more pleasingly in my view than the blades on the Apo-Digitar iris mount and the enlarger mount. Pay attention to the shape of the aperture blades if that's something you worry about. This is what the Makro-Iris aperture blades look like in my 90mm:
Rob