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AO American Optical #1245 Phase Star Contrast Aperture Viewing Unit
Intermediate with flip in prism
eBay item number: 157170923860
Condition: Used
Brand: American Optical
Model: 1245
Seller Notes: "The lenses and prisms have no fog or haze. There is minor dust. The adjustments work."
In the last two photos you can see a microscope fitted with this same model aperture viewing unit
(microscope not included)
The Phase Star Aperture Viewing Unit allows you to binocularly view
and quickly focus on the phase annulus of the objective to check for proper phase alignment.
This serves the same purpose of a phase telescope.
Petrographic microscope, Bertrand lens and interference figures
AO PolStar
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