My 1950's era Wollensak 90mm/4.5 Enlarging Raptar, designed to cover 6x9 with no light fall off in the corners. I have two of them, one on my D-6, and a NOS one in the original case for back up. I've made 16x20's with this lens, crisp out to the edges.
The answer is someone what complex, enlarging lens are designed not only to cover a given area or negative size, but also to a given enlargement size, and aperture. The designer design lens with different number of elements to correct for distortion and improve sharpness, APO lens are designed for color correction. Faster lens like 50mm 2.8 generally have more elements, some are 4 element, others are 5 to (I think 7) elements. In my experience many 4 element lens like Wollensake or Kodak Extar stopped down are as good 5 or 6 element lens.
See http://ctein.com/booksmpl.htm Really a book on printing, but it reports on tests of a number of enlarging lenses. Reports on lenses start at p. 88.
The Rogonar is sort of bottom of the barrel. At today's prices there's no good reason not to get a Rodagon or an El-Nikkor.
Much of the difference in enlarger lens quality is concerned with the performance in the corners of the projected image. With a simple (few element) lens the illumination is brighter in the center and dimmer in the corners, this causes the print to be pale in the corners. The effect is minimized when small apertures are used. Sharpness in the corners is also a concern, to obtain it with a simple lens it is usually necessary to use small apertures.
The Rodenstock literature above states that the simple lens with fewer elements gives best quality closed down to f11. The more sophisticated lens with more elements maintains quality at larger apertures, f8, f5.6 and in some cases f4. The wider aperture gives a brighter image on the paper which translates into shorter exposure times.
It is common with even the best enlarging lenses for the widest aperture, that is used for focusing, to be slightly inferior quality, and exposures are made with the lens closed down one two or three stops from maximum to achieve the best quality. The best lenses can be used one stop down, second best two stops down, third best three stops down.
Earlier on ebay.com I saw several Rodagon 105mm f5.6 lenses (six element) that had sold for less than $50, prices for excellent lenses are very reasonable it seems.
the ELNikkors are all top-quality enlarging lenses at a very reasonable price.go for an 80 or 105mm focal length in a six-element design.Hi, all - I'm shopping for a new enlarging lens for my MF negs. I'll print mostly 11x14 prints using a 105mm lens, probably 5.6. Any preferences or opinions between Nikon, Rodenstock, or Schneider?
Cheers,
Mike
I use 105mm Componon & Componon-S lenses for 6x9 both superb lenses.....
Ian
Here's your lens, right here.
http://www.ebay.com/itm/Kodak-Ektar...739244?hash=item4899aa976c:g:KlQAAOSwCU1Yu0~s
I,m not sure if I,ve gotten a message to Julie concerning an enlarger lens. So I,m just reposting here in case it failed . If
you're out there Julie , give me an email. Regards, Peter
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