Re: Photomicography with 2.5x objective - uniform illumination?
- From: Gary G <see.signature@bottom>
- Date: Mon, 16 Jul 2007 13:11:07 -0800
On Mon, 16 Jul 2007 10:18:47 -0700, selwyn.stleger@xxxxxxxxx wrote:
I manage reasonable photos using medium and high power objectives but
have been having difficulty with a Zeiss plan 2.5 x objective.
Visually, the image is stunning and evenly illuminated. However,
photography is another matter: there is severe vignetting and obvious
non-uniform illumination from a central bright spot outwards.
I am using a Zeiss standard 16 with inko condenser. I have removed the
top condenser (1.4 NA) lens which I am led to believe leaves a circa
0.32 NA condenser lens. I set up for Kohler as best the system will
allow. The sub-condenser switchable lens is left in place.
Do I need a condenser of lower aperture?
Do I need a diffusing filter?
Or what?
I should be grateful for suggestions.
Selwyn
This happens with all scopes I have used. The low power objectives
need the "ultra low" condenser. For my Oly BX scopes, it is the only
way to go to get even coverage.
I have a new Zeiss 44 53 12 lens thing that looks like a swing out
ultra low power condenser. This might be what you need.
Kiss French. Drink California.
gary at gaugler dot com
.
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- From: selwyn . stleger
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