Nikon Coolpix and Leitz eyepiece vs Optem set up
Below are 2 photomicrographs comparing different ways to attach a Nikon Coolpix 990 to a microscope.  The first picture is taken at 4x with in descending order a Nikon Coolpix 990 with a Leitz 10X eyepiece screwed into the lens mount for the Coolpix which was then inserted into the phototube of the  Olympus BH2 microscope.  The second picture also at 4X and from the same case shows  the Coolpix 990 attached connected by a an Optem relay lens connected by 2 "connecting pieces" which sit on top of an Olympus C mount which in turn sits on top of an Olympus BX51 microscope [Optem relay lens 257014 (screws into lens mount of camera), Optem connecting piece 257015, Optem connecting piece 29-90-56, Olympus C mount UDA-4E00435].  Both microscopes have "plan" lenses.  I think you will agree that the Optem setup has the image better centred on the CCD chip.  This allows more flexibility with field of view so you don't always have to be so far zoomed in to remove vignetting (the circular image).  There is also  is more uniform light intensity and more "plan" like focusing across the image.

Coolpix, Leitz eyepiece and Olympus BH2

 

Coolpix, Optem setup and Olympus BX51

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