Kent
Finally at home...
I've got the V4 and I truely love it, on the M6, the M8 and the Sony A7II. 😉
Every v2 will develope haze, sooner or later. You can have this cleaned, but after the cleaning the lens will most likely not be the same as before the haze starts.
It is hard to believe that the haze is caused by the focusing helicoid. More likely it is caused by the grease of the aperture mechanism.
That is something to be aware of. Every link in the chain has to degrade the image somewhat. But I don't think a good enlarging lens would cause significant degradation. They are slow lenses corrected for the range of reproduction ratios that go with enlarging. A while ago I asked at my local pro shop if there was anything better than what I use (Schneider Componon). They said there is nothing better, not the EL-Nikkor, nor anything else.
Each time I took a lens apart in order to clean the aperture blades, I discovered noticeable amounts of liquid oil everywhere inside.
I completely agree with the first part but have to disagree with your pro shop's evaluation of lenses.
I figured many years ago that I made over 100,000 prints as part of my work. I'd guess I've easily tripled that number now.
I've used a lot of top quality enlarging lenses in the process and talked to other printers at pro labs I've used. My favorite 135mm of all time is the Fujinon EX enlarging lenses with a really close second being the late version EL Nikkor lenses. The Fujinon don't come in all a focal lengths and have always been tough to get. Like I said the late model Nikkor EL are really close. They're consistently excellent in any FL. The early version is excellent too. The Componon S Schneider are excellent as are the old chrome non S. I use a non S 180mm on my Durst 5x7 with excellent results. I previously had a 180 Componon S and can't see any difference between the Non S and the S in that FL. I've used both the old non S and S versions in FL's up to 180mm. They're all good but I don't care for the ones with the plastic mounts. Inferior build quality. I have a 50mm S that's trash and falling apart.
I own several Rodagon lenses up to 210mm. They're excellent and on par with the Componon S but no better.
I have the mentioned early Focotar and imo it's not in the same class as the old non S Componon and certainly not the EL Nikkor or Fujinon EX. It's been a while since I printed with the late Focotar but nothing stands out about it that would make me want to buy it over any of the above.
I've even printed with the old post war Kodak Ektar lenses and Ilex. These are good lenses and are a bargain.
The one lens I'd love to own or at least print with is the Goerz 150mm. Was it a Magnar? When it was made it was billed as having double the resolution of others and double the cost. Printers that used it swore by the lens (before internet). I've only seen one for sale years ago and it was over $2,000. It would have to do more than make beautiful images for that price.
I recently aquired another v2. This one is never opened, I just took a look. No oil nor soap whatsoever. No haze either, however, the grease on the focusing helical is dirty black stuff so focusing is stiff, irregular and produces a sound. I will replace the grease. Do you have a suggestion what to use?
Erik.
Modern 100% synthetic grease, but made according to professional standards so that it doesn't contain oily solvents which would quickly separate from the lubricant base and migrate everywhere in your lens.
Just have a look at Nye or Moebius products catalogs.
Loctite and Weldtite make some good white lithium grease designed for ball bearings or plumbing threads
one thing no one ever mentions with the V4 is if it develops a wobble the lens is essentially garbage. The helical in the V4 summicron is constructed in such a way that in order to disassemble the lens to regrease the lens or repair any wobble it may have you have a high likelihood that it wont reassemble to the same tolerances which means the lens will still be loose.
I had a V4 summicron that spent more time in the shop than with me shooting because of a wobble issue. Once I got it back it still had the same issue. I sold it off to an a7 user and it began its second life.