I wonder if there's any relation between the Vivitar lenses you're looking for and the Computar 55/1.9, since that's the only commercially available enlarger lens I'm aware of with a floating element, and it appeared around the same time period.
Never seen one, not in the Photo Cornucopia data based.
The WOLF guide, lists two SERIES 1 enlarging lenses -- no specs -- the VHE line, which are Rodenstock, I think, and a FLAT-FIELD line -- no details either.
Very interesting! Don't know any f/2.5 enlarging lens, actually... and I have seen quite a few.Yesterday I added currently available information about them to the DELTA database. Will update.
The British Journal of Photography also refers to them in 1979, confirming the 50mm as f2.5 not f2.8.
The Photo Cornucopia Big List only mentions 4 of the 31+ Vivitar enlarger lenses. To be fair, most aren't very interesting: John's focus was on the good stuff.
Just as an aside for your list: I own the Vivitar 35 mm f/3.5 lens with the recessed body, and I'm pretty sure it's a 3 elements in 3 groups design, just as all the others.Here are a couple of WIDE lenses -- sold under various labels:
http://www.subclub.org/darkroom/lenses.htm
We've not yet done a deep dive into Vivitar enlarger lenses, but here are a few handy tidbits. The timeline of Ponder & Best / Vivitar and their move from LA to CA is well known, and helps date many lenses by the packaging.
1. The well-known key that reveals the secret identity of the manufacturer doesn't work with Vivitar's enlarger lenses. They appear to be chronologically sequenced. If so . . .
2. It appears that Vivitar dropped the LU suffix for later all-silver models (therefore LU models are made earlier than 1979)
3. Post-LU all-silver models were marketed as 'Flat Field' (therefore made after 1979)
4. The catalogue numbers of both ranges are identical, suggesting they were identical apart from the branding.
5. Kino made the early 50/3.5.
6. Schneider made all the VHE's Vivitar sold from 1977-1985.
7. However, the optical components of the VHE's were all made in 1975-76 - the last of the pre-S Componons.
8. Vivitar 35/3.5 were triplets: it's printed on the packaging.
9. The six-element 'fast 50' is tantalisingly similar to the Hoya EL, but can't be conclusively identified as such. That lens came in two versions, [V2] superceding [V1]:
9a - Version 1 (pictured above) was AKA Spiratone Resomax, Jessop, Vivitar, Fujimoto, E-Lucky and Phago - all were serialled. All have straight-8 diaphragms. They date from c.1980-1984. Vivitar marketed it as part of their 'Flat Field' range.
9b - Version 2 (likely upgraded and post-1985) was AKA Spiratone Resomax, Jessop, Vivitar, Fujimoto, Durst Optar and Cambridge EL Pro Cambron - none were serialled. All have straight-6 diaphragms.
19c - I'm still finding new versions of these lenses under different names, and still not sure of the manufacturer. If you have any theories or find any variants Delta doesn't yet know, please let me know.
I've asked the question. Certainly the JML-branded lens is part of the same series. With regard to JML, they could have made it, but did they? My money has always been on Fujimoto, for what it's worth.
Often in this market it's better for companies to let an appropriately setup subcontractor handle production. Even if they're capable of gearing up to do it themselves, it's not always cost-effective – especially if volumes aren't huge. Vivitar was unusually magpie-like in this regard, but it worked for them. Series 1 was different, of course.
Can you share an image of the DO Industries version - 135mm or 50mm?
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