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View the Latest Mirrors & Holder Reviews

Item
Submitted By
GSO Primary Mirror Cell for 8
GSO Primary Mirror Cell for 8" Mirrors (with Cooling Fan)
5.0
GSO Primary 8” Mirror Cell
This cell is very well designed and very much a value for the price. The fan is a good addition to maintain stability of the mirror and the air in the optical tube assembly. The assembly maintains the mirror in a stable position within the tube. I wo...
GSO Parabolic Primary and Secondary Mirror Set - 16
GSO Parabolic Primary and Secondary Mirror Set - 16" f/4.5
5.0
Typical, high quality GSO Optics; fair price & good service
Typical, high quality GSO Optics; fair price & good service; Gives outstanding views as a Dob mounted instrument
GSO Parabolic Primary and Secondary Mirror Set - 8
GSO Parabolic Primary and Secondary Mirror Set - 8" f/6
5.0
Very nice optics at a reasonable price
On the first night out with the GSO 8" f/6 optics, built into a homemade tube assembly, a simple star test revealed that the figuring was certainly very adequate. I've been using f/4 and f/4.5 mirrors for many years and had almost forgotten just how ...
GSO Parabolic Primary and Secondary Mirror Set - 6
GSO Parabolic Primary and Secondary Mirror Set - 6" f/4
5.0
Acceptable quality mirror
We carefully measured the surface quality using UA3P and profilometer. The RMS of the surface figure was 94 nm which is about lambda/5. The surface roughness was about 1 nm. This is good enough for astronomical observations in diffraction limit....
GSO Parabolic Primary and Secondary Mirror Set - 6
GSO Parabolic Primary and Secondary Mirror Set - 6" f/8
5.0
Great value
Speedy service, well packaged for the trip. Used to make a 6 inch Dobsonian for a 6th grade class. Excellent and clear views when the scope was finished. Would order from you again, and have recommended the same to several of my teacher friends.
GSO Parabolic Primary and Secondary Mirror Set - 6
GSO Parabolic Primary and Secondary Mirror Set - 6" f/8
5.0
Perfect Mirror
This mirror gives the best detail of any mirror I have ever used. I tested it with my Foucault tester and it is near perfectly parabolic all the way to the edge.
GSO Parabolic Primary and Secondary Mirror Set - 8
GSO Parabolic Primary and Secondary Mirror Set - 8" f/6
5.0
Excellent quality and delivered on time!
I wanted to build my own telescope, so this mirror helped me achieve this goal. I'm not an expert but I find this mirror very well made and it's been a pleasure looking at the sky now.
GSO Parabolic Primary and Secondary Mirror Set - 6
GSO Parabolic Primary and Secondary Mirror Set - 6" f/5
5.0
GSO mirror set
I built a 6" f5 dobsonian telescope with the mirror set. It came out perfect.
GSO Parabolic Primary and Secondary Mirror Set - 6
GSO Parabolic Primary and Secondary Mirror Set - 6" f/8
5.0
Great telescope mirror
Atm, first light last night, stunning!
GSO Parabolic Primary and Secondary Mirror Set - 6
GSO Parabolic Primary and Secondary Mirror Set - 6" f/8
4.0
Excellent quality mirror
This mirror exceeds the quality of the original and was a direct replacement for my 40+ yr old telescope. I did not have to modify the mirror mount or adjust the focal plane.
GSO Parabolic Primary and Secondary Mirror Set - 8
GSO Parabolic Primary and Secondary Mirror Set - 8" f/6
5.0
GSO Parabolic Primary mirrors - GREAT !
This is the 8th mirror I've purchased from Agena - the first 7 were 6" f/8's which were used in an ATM course I taught resulting in 7 great little Dobs. The 8" f/6 went into my own sturdy GEM tripod mounted scope. The mirrors were all first rate and ...
GSO Parabolic Primary and Secondary Mirror Set - 8
GSO Parabolic Primary and Secondary Mirror Set - 8" f/6
5.0
Very pleased - great value
I purchased the GSO 8 inch f6 primary and secondary mirror set from Agena to use in a travel scope I was building. I finished the scope a couple months back and have had the scope out multiple times. I don't know how to test mirrors but I have seve...
GSO Parabolic Primary and Secondary Mirror Set - 8
GSO Parabolic Primary and Secondary Mirror Set - 8" f/4
5.0
Good quality at a fair price
I tested the mirror, both with a knife edge tester and in a telescope. The figure looks to be at least 1/4 wavefront quality (that means 1/8 surface), as advertised. Price was very fair and delivery was prompt. Thank you, Agena.
GSO Parabolic Primary and Secondary Mirror Set - 8
GSO Parabolic Primary and Secondary Mirror Set - 8" f/4
5.0
Excellent mirror at good price.
Very nice mirror at good price. Quick shipment as well. I tested the mirror on my mirror tester and it came in at least as 1/4 wave front quality, which for the price is very respectable. Imaging with a coma corrector produced excellent results over ...