Astrocatou:
Edmund Scientific 15 cm mirror
Astrocatou:
Thermal expansion
Astrocatou:
? Central area
Astrocatou:
Foucault test 30cm
Astrocatou:
Foucault test
Astrocatou:
FOR SALE 12" mirror lightly used
Astrocatou:
Owl Optics collimation
Astrocatou:
Collimmation tests: pinched primary
Astrocatou:
collimation test image