- Joined
- Jul 14, 2011
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- 8x10 Format
Lachlan, I get wryly amused whenever someone tries to save up enough money for the "very best" (an Apo El Nikkor), but doesn't even realize that their garden-variety enlarger won't even reliably hold the weight of the thing, and will either deflect out of alignment or tend to vibrate. Then they want to use a glassless carrier, defeating any kind of precision! - like they're intending to drive around a flashy Ferrari which has three flat tires.
Zeiss made them for years before Nikon entered the market.Bob - circuit board printing didn't even exist in the present sense when Apo Nikkors were introduced. They were marketed to the printing industry, and soon caught on with pro photo labs making big enlargements. And industrial applications for Apo El's didn't typically require adjustable apertures or correction over a wide focus range, so comprised another market category entirely. But in terms of Euro equivalents from Rodenstock or others, you'd have to tell me. Certain local chip makers have even employed some of the recent Zeiss-Nikon (Tokina) 35mm lenses. I pay about as much attention to that industry as I do to corn flakes manufacture - one is an edible chip, the other isn't.
My lensboard is still stuck in the USA. I might get it shipped up here in the next month or two
But the original neg wasn't very sharp at all by modern standards, and doesn't hold up to enlargement much bigger than 2X very well.
Anything bigger than 20x24 was typically sheer mush.
Even in the case he was only able to resolve 25lp/mm, which for sure the Cooke was able, a 40" (4x) print is to be well sharp.
See again that 1885 shot...
The nominal/ theoretical.
There's a lot of mythology to this whole topic, and especially with what people regard as cult lenses from the past.
You overlook what a fully assembled old Cooke (both cells in this case) can do.
This is only 1885 and 5x7", before astigmatism could be corrected and shot with an inferior format
View attachment 255627
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When you have to stop a click beyond f/32 (for DOF) your top notch "modern" lens is not to resolve much more than the Cooke, perhaps the same, because of diffraction.
The crappy lens AA used is the Adon for the Half Dome when he was "poor", the Cooke of the "Clearing Strom" plays in another division.
I probably had better things to do, like earn a living, but this thread and the high proportion of argument based upon postulated first principles and hypothesizing made me hungry for some experimental data.
As it happens, I have several Double Protar VIIa lenses made by both Zeiss and B&L under license, including 145mm, 165mm, 183, 254mm, and 300mm. All are double cell lenses of 8 elements i in 2 fully cemented 4-element groups, one on each side of the shutter diaphragm. Although uncoated, the minimal number of internal air-glass surfaces helps avert serious contrast loss. AA wrote using some of these Double Protars in various well-known photos in addition to his Cooke XV.
The Double Protar VIIa lenses are similar in design to the Cooke, although without the Cooke's internal air space, and are of roughly similar vintage and intended use. Protar VIIa lenses were certainly among the most sought-after triple convertible lenses and arguably better corrected than pre-WWII Dagors, due to the Protar's extra element in each cell.
I paired each Protar with its closest equivalent modern Fujinon W or equivalent lens that I had avaialable, the 145mm with a 150mm/ 5.6 Fujinon NWS, the 165mm and 183mm Protar VIIa compared with a 180mm Sironar N, a 183mm post-WWII Goerz American Dagor, and a 210mm/9 G-Claron, the 254mm Protar VIIa with a Fujinon 250mm CW-M and also with the earlier Fujinon 250mm/6.7 W (inside writing). The older 300mm B&L Protar VIIa was paired against a 305mm G-Claron.
I then shot each of the sets on 5x7 Delta 100 film at the half-stop between f/22 and f/32 against an outdoor scene of soft white pine needles and other leaves and metal fencing. I developed in XTOL diluted 1:2 used as a lightly agitated (every 3 minutes) stand developer to compensate for any overly bright highlights beyond Delta 100's comfortable capability.
No surprise, but those older Zeiss/B&L Double Protar VIIa lenses just weren't as sharp or crisp as their modern counterparts, nor were close tones/Zones as well-differentiated by Double Protars, which was important in the test scene.
While some may prefer the softer, less sharp look of older pre-WWII triple convertible lenses, that's a personal preference but we shouldn't kid ourselves that they're fully up to modern standards. Personally, I had hoped otherwise.
FWIW, the best of the older Protars was the 165mm Double Protar VIIa, the only completely symmetrical lenses as both front and back cells were both 290mm. The others were close but not fully symmetrical, being 290/220, 350/290, 19"/16", etc. Complete front and back symmetry may be helpful with these older lenses.
For the record, I happen to like the look of mid 20th century lenses (though preferably in their coated variants), but I'm under no illusions as to their contrast/ MTF performance relative to the newer designs from the 1950's on.
and was amazed that the contrast of the Dagor was close to a good coated lens, a similar aged Tessar was way different.
the multicoated Kern 14 inch.
My first Dagor was actually the last to be made (with one rare exception) - the multicoated Kern 14 inch. It had the highest contrast, best microtonality, and purest hue rendition of any lens I've ever had, in any format. It was quite sharp, but not as sharp as my equivalent focal length Fuji 360A "Super Plasmat", nowhere near as good close-up, and not anywhere near as good in terms of tangential performance with strong tilt. .......... My 4-element airspaced dialytes for field use are Fuji C's, and being late multicoated lenses, are nearly equal in performance. .....
Sironar N, Sironar N MC, Apo Sironar N?I agree with Drew about post-WWII Dagors. The 7" US-made Dagor, factory coated, is one of the best lenses that I've used - fully equivalent to my Sironar-N of the same focal length.
Both of my post-WWII Kodak 8"/7.7 factory-coated Kodak Ektars are also very good and are Dialyte designs similar to the later Fujinon C. Multicoating would have been nice on the Ektars, but doesn't seem necessary for the later Dagors. T
he Cooke is, as I recall, 8 elements in four groups, two groups in each cell, with an air-space. In the broadest sense, one could consider the Cooke to be vaguely akin to the Dialyte but with each Dialyte element consisting instead of a cemented pair.
Ian - my late moderl reverse-Dagor design 120mm Angulon is decent but the multicoated 125mm/5.6 Fujinon NWS fully air-spaced Plasmat is markedly superior.
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