Re: Digital Reflex on microscope
From: Gordon Couger (gcouger_at_NOSPAMprovalue.net)
Date: 06/27/04
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Date: Sat, 26 Jun 2004 19:00:41 -0500
"Aaron" <nghy@comcast.net> wrote in message
news:agtjd01772es0qts1m8tjjjd8dc8ldh75f@4ax.com...
> Hello,
>
> The Nikon D100 SLR is not suited for this application. The Coolpix
> 990, 995, 4500, and 5000 all can be adapted with a simple eyepiece
> relay lens adapter. That is what your friend had.
>
> Most cameras (film or CCD) having a standard fixed lens will work with
> an eyepiece adapter. Since the trinocular port is equivalent to either
> of the tubes that you normally look through everything is close to the
> same focus.. You can chose to install a lens on your D100 and move it
> very close to the eyepiece or you will need a much different setup.
>
> To adapt a SLR camera (without the front lens installed) on the
> microscope requires a special projection eyepiece which focuses the
> image on the CCD directly. This projedction eyepiece is chosen so that
> the image is adjusted for the film size. A CCD chip is much smaller
> than any film system. Your relay lens needs to reduce the image size
> to the size of the CCD. Without the reduction, only the center of
> the image will fall on the CCD. That is why you get the unintended
> extra magnification
>
> Even with the older film cameras a special focusing system was used
> that split the image going to the film .Part of the image was focused
> on a ground glass plate that was optically equivalent in distance to
> the film. A special eyepiece was used to view the image projected on
> the grould glass screen.
>
> You need to consult a book on the subject. I recommend "Photography
> with a Micorscope" by Fred Rost and Ron Oldfield. It is an expensive
> book but it clearly illustrates the problems and the solutions.
>
> Aaron. .
>
Try inter library loan for expensive books you are not sure how badly you
need. Often you only need the information once or can copy what you need
while you have the book.
I have better access than most I only have to email my wife at work at the
OK State Vet Med library and she handles the rest including delivery but it
is little more trouble then checking a book out of the library except the
extra trip.
Gordon
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