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| Nikon Objective |
This objective is recommended by Johan J Ingles as "wickedly sharp". I believe it is! It is a 10x objective with 0.25 aperture. The model number is OFN22 and the working distance is 10.5mm. I consider that working distance essential for it to be used in my lighting setup, fotodiox LED 440.
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| Nikon Objective |
In addition to the above it is ∞ corrected and does not require a cover slip. One thing I missed above was that it is plan. This means the image projected on the sensor is flat, optimal, and not concave which causes the edge to go soft.
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| Osumilite |
It stays sharp to the edges (see the upper right corner).
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