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 Replies: 35 / Views: 7,367 |
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Pillar of the Community
United States
9796 Posts |
Quote:
Here is the link to the Rodenstock 75ARD1 page. Follow the tech specs link to download the pdf, and then you have to click inside the pdf to get the MTF curves...Ray That is insanely close to perfect for a lens! My old EF 200mm f/1.8 is close but not quite as good on MTF and it is one of the highest rated MTF ever made. This one is on the list to get. THe last comment I made about one on ebay selling for $161.00 was incorrect that was the model II not the one Ray is using, they are a bit harder to find and cost a lot more it seems. "Buy the Book Before You Buy the Coin" - Aaron R. Feldman - "And read it" - Me 2013! ANA Life Member #3288 in good standing since 1981, ANS, Early American Coppers Member (EAC), Colonial Coin Collectors Club member (C4), Conder Token Collector Club member (CTCC), Civil War Token Society (CWTS) member, Liberty Seated Collectors Club (LSCC) & Numismatic Bibliomania Society member (NBS), USMex, Member in good standing, 2¢ variety collector. See my want page: http://goccf.com/t/140440 |
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Pillar of the Community
 United States
4038 Posts |
Ironically, the MTF for the 2x are not as good as the 1x, even at 2x (!). I've verified this with a sample I own (and would like to sell...). The 1x is about the best you can get, only bettered AFAIK by the Printing-Nikkors...Ray
Contact me for photographic equipment or visit my home page at: http://macrocoins.com |
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Pillar of the Community
United States
4038 Posts |
One more thing about the 75ARD1...it's actually an achromat, not an apochromat. It may be constructed like an Apo lens, but the LCA curve (bottom right on the MTF page) shows only 2 zero crossings, not 3, and no second downward inflection characteristic of an apochromat. So they can call the lens Apo if they want, and in fact a bunch of refs say that mfrs use the term "Apo" to mean "our best", but in reality it is not truly Apo. And SuperDave, did you see they have a 120mm version of the ARD? They rate it from 0.5x to 3X. I've never seen one or heard of one being used, but it might be an interesting lens for someone wanting more working distance. I've been looking at the MacroVaron 85mm f4.5 as well, not to buy but as an example of new lens tech. Actually, the tech is pretty old, as the variable-mag technology was developed by Nikon for their first-generation 150mm Printing-Nikkor (the newer "A" version is fixed at 1:1 optimization), but now Schneider is using it on the MacroVaron. At over $5k the MacroVaron is outside my reach, but is interesting to look at. The MTF's still don't match the Printing-Nikkors from the 1970's... Here's a link to the Schneider MacroVaron page: https://www.schneideroptics.com/eco...353&IID=6855 |
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Pillar of the Community
United States
3546 Posts |
rmp., This thread has now enticed me to look into better methods for improving my lighting sources. Now the only stumbling block remaining is to be able to find some spare time for this cool project. By the way congrats on your recent coronation of becoming a 'Pillar'.  mdpmedia |
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Pillar of the Community
United States
4038 Posts |
Aha! I did not see my title change. Too cool. Thanks for pointing it out.
Lighting is everything with coins. Well, almost. My normal priority list goes like:
1) Focus
2) Composition
3) Exposure
Actually, lighting isn't even in the top 3, but in general the assumption is the top 3 are already met. If one or more of the top 3 are lacking, it really doesn't matter how good your lighting is. But given all of the top 3, lighting is the next most important thing...Ray
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Replies: 35 / Views: 7,367 |
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Posted 02/05/2012 8:47 pm
