Nope, not so. They are quite different lens designs-- the Rogonar-S is based on a tessar design, and the Rodagon is a double Gauss type. All other conditions being equal, the Rodagon should outperform the Rogonar-S, but they are both fine lenses. You can google, and find the technical details.
I was told the more elements and group in a lens, the better the lens is
An oversimplification, but you are correct that increasing the number of elements increases the lens designer's ability to correct for aberrations. Everything else being equal, this is arguably true, depending on what you mean by 'better'. (Having said that, many of us really like simple tessar and sonnar-type lenses as taking lenses.)
Dave S Subscriber, Sep 13, 2009; 09:10 p.m.
Brain not engaged in my last post. A Rodagon is of course not a Gauss design; it's a plasmat type, like other six-element enlarging lenses.
Marc Todd , Sep 14, 2009; 12:58 a.m.
One of looking at it is the Rogonar series is a lower priced lens intended for people on a budget. Schnieder also has a lower priced line of 4 element lenses. These days with darkroom items going so cheap, it's foolish to skimp on the enlarger lens. Any 6 element lens from Schnieder, El Nikkor, or Rodenstock, will out perform any 4 element lens. Go with one of these. I purchased my 50mm El Nikkor from that auction site for less then $50 used, like new in the plastic case with caps.
Nope, not so. They are quite different lens designs-- the Rogonar-S is based on a tessar design, and the Rodagon is a double Gauss type. All other conditions being equal, the Rodagon should outperform the Rogonar-S, but they are both fine lenses. You can google, and find the technical details.
I was told the more elements and group in a lens, the better the lens is
An oversimplification, but you are correct that increasing the number of elements increases the lens designer's ability to correct for aberrations. Everything else being equal, this is arguably true, depending on what you mean by 'better'. (Having said that, many of us really like simple tessar and sonnar-type lenses as taking lenses.)
Dave S Subscriber, Sep 13, 2009; 09:10 p.m.
Brain not engaged in my last post. A Rodagon is of course not a Gauss design; it's a plasmat type, like other six-element enlarging lenses.
Marc Todd , Sep 14, 2009; 12:58 a.m.
One of looking at it is the Rogonar series is a lower priced lens intended for people on a budget. Schnieder also has a lower priced line of 4 element lenses. These days with darkroom items going so cheap, it's foolish to skimp on the enlarger lens. Any 6 element lens from Schnieder, El Nikkor, or Rodenstock, will out perform any 4 element lens. Go with one of these. I purchased my 50mm El Nikkor from that auction site for less then $50 used, like new in the plastic case with caps.
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