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Customer Feedback
Last night I had “first light” with the 12.5” f/6 mirror that you recently
supplied. It is truly a magnificent optic! Ronchi, knife-edge, and star tests
were straight out of a textbook, and the image of Saturn was breathtaking.
Despite the thin substrate, there is no hint of astigmatism. Frankly, when I
purchased a Hubble Optics mirror on xxxx, I was skeptical of the
advertised wavefront quality. For the low price, it just seemed too good to
be true. In the future, I will not hesitate to recommend your firm’s optics to
friends and acquaintances...
-Tom Dobbins
Contributing Editor, Sky & Telescope magazine (quoted by permission)
I’ve tried buying fast 8” mirrors twice through A-mart and both were dogs –
terribly undercorrected, probably spherical. This mirror is way different.
Stars are near pinpoints and there is no tendency to astigmatism (at least
nothing that didn’t come from my eyes). I went out tonight and looked at
Jupiter as soon as it became visible. Even so, it is getting pretty low in the
sky and the air was pretty wavy. As near as I could tell, in the moments of
stillness the images were as good as any scope I own.
Star testing showed even images that were very nearly the same inside
and outside of focus. Using my EZ tester (ronchi eyepiece) showed nice
straight lines and no hint of TDE.
As far as I can tell this mirror is a winner and will suit my needs very well.
Whether or not it actually meets the specs listed on the box I can’t tell
without getting it tested. But its a lot better than the other Ebay mirrors
and I like it. I wouldn’t be afraid to buy another Hubbleoptics mirror...
-Dave Chadsey (posted at http://www.cloudynights.com)
I am no optical expert but it is clearly a better mirror than the one in my
xxxxx OTA. I am able to use 144x with no problem, 60x was the maximum
with the xxxxx. There is more contrast and less coma also. I did a star test.
The pattern was much more similar inside and outside of focus than the
xxxxx mirror although it did seem a bit dimmer past the focus point. Maybe
it is my lack of skill in collimation since it improved when I made some
adjustments in the secondary mirror.
I had to modify the mirror cell since the mirror was a bit larger.
-Gary
A real piece of art (14" lightweight sandwich mirror)...
-Alain
I just tentatively assembled my 10" F4.7 1/17 PV wavefront mirror in my
observatory and watched Jupiter and the moon last night. Although the air
condition was terrible due to middle of rainy season, optical performance
was exactly as I expected! The surface of Jupiter was amazing. Contrast
of color was deep and details were very sharp, image edge was knife
cutting, even through hazy bad seeing. The surface of the moon had an
extra contrast; very very sharp edged landmark was attractive enough to
keep watching hours. A hair splitting and breath taking experience, which
reminded me of previous mirrors. I need to further tune up optical
performance of this scope such as replacing with smaller high precision
secondary mirror etc. Will report further progress.
-Kazuki Yamane