What, exactly, makes this lens so special and how does it compare to Schneider and Rodenstock lenses?
Nothing really. I suppose it would be ideal if you were working with 127 negatives, but otherwise there's no point. It doesn't have enough coverage for 6x4.5, so it's not even good for the smallest of currently available medium format negatives. It will work for 35mm negatives, but you'd need to raise the head higher for a given print size, and I don't see where that's of any practical advantage unless your aim is to make small prints from 35mm negatives with a 4x5 enlarger. But in that case, you can easily use a more common 80 mm enlarging lens. The higher end 50 and 80 mm enlarging lenses from Nikon, Schneider, and Rodenstock are very, very good and I'm hard pressed to see anything that works substantially better.
RalphLambrecht;... It should have a bot more coverage than a regular 50mm lens said:******************
That's why I use a six element 60mm Rodagon for my 35 mm negs. Ye olde lab ratz told me always use a lens of longer focal length than necessary to cover the image for better edge sharpness and most even illumination possible. Who am I to quibble with them?.
... I have one each of the 6 element, 50 mm high end enlarging lenses from Nikon, Schneider, and Rodenstock and have never seen a fall -off problem with any of them. ...
... This lens does have some popularity among the UV (not IR, but UV) photography crowd because this lens is supposed to be somewhat better corrected for focus shifts in the near UV light range. ...
I have one each of the 6 element, 50 mm high end enlarging lenses from Nikon, Schneider, and Rodenstock and have never seen a fall -off problem with any of them. .
... Who goes around making medium gray test prints on grade 5 paper? I suppose some nerd somewhere will think it's great fun.
How are you using them? If you are not doing big enlargements, you are only using the center anyway. For big enlargements, the corner resolution will fall off to some extent with all 3. Easly minimized by a longer focal length lens or a "High Magnification" lens of the same focal length.
How do you figure that if you don't crop? .
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