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Olympus OM 50mm f/1.2 Zuiko
I had this lens converted into Nikon mount. Very bright central area precludes use at apertures smaller than f/5.6. In practice, the lens flares easily and a combination of vignetting and hot spots can conspired to make even shots at f/2.8 a problem.
Olympus 50mm f/1.2 Hot spots
Hot spots behavior is even worse in field shots than the results below might suggest. An aggressive lens hood is in order for this lens.
Olympus 50mm f/1.2 backfocus
Backfocus is moderately strong and focus adjustment is mandatory.
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Diglloyd Infrared Photography covers cameras and lenses for infrared photography.
The coverage explains all the issues involved in shooting for monochrome and in infrared. It is not a review of any particular camera or lens, though many examples are included.
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View an overview of infrared as well as filter spectral transmission plus examples from an optimal lens.