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#19
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Lens Cell Cleaning
wrote in message ... On 2/13/2011 3:22 PM, Richard Knoppow wrote: However, the Geronar is a Cooke Triplet, a three-element, air-apaced lens with no cemented surfaces. Its of high quality and such lenses are capable of good performance at moderate stops. From my use, it's a very nice lens given a bad rap mainly because it was sold at a low price as a "novice lens". Who wants that when you can buy a pro lens? :P It's multicoated, comes in a modern, reliable shutter and is small/lightweight. It actually folds up in my super graphic. Given most LF lenses are used around f22, the wide open edge performance isn't an issue for most people. I've actually done some portraits with mine on 4X5 at f11 and they look great. The only disadvantage I see with this lens is the smaller image circle compared to the much Larger/heavier/more expensive plasmat types. If I had to choose this over some vintage lens that has questionable coatings and flaky/ancient shutter, I would get this one in a heartbeat. Stephey A carefully designed Triplet is capable of excellent performance and Rodenstock is noted for making good lenses. I am not sureprized it works well. Somewhere around f/22 is the "optimum" stop for many LF lenses. The limit of a Triplet is that they are hard to correct for either high speed or wide angle, if it isn't required to be either it can perform entirely satisfactorily. -- -- Richard Knoppow Los Angeles, CA, USA |
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