Re: 1/6 or 1/8 wave

Paul Jones of Star Instruments states unequivocally on his web site
that Pyrex mirrors will hold no better than 1/4 wave because of
"expansion issues".

Sounds like false advertising to me. Lets sue em!

And even if you had 1/8 wave at the mirror surface, you would have far
less at the eyepiece, right??


RMOLLISE wrote:
Hi:

Intes advertised the MK66 standard model as "1/4 wave." They tended to
test out a bit better than that, however. The Deluxe was "guaranteed"
to be at 1/8 wave, and the few I've looked at tend to approach that.

What's the visual difference between 1/6 wave and 1/8 wave? Very little
to the point of undetectable for most observers under most condtions.

Uncle Rod


khobar wrote:
I've seen a couple of Intes MK66's advertised - one 1/6 wave and the other
1/8. The 1/8th should be better, but could someone give me an idea of what
the visual difference between 1/6 and 1/8 might be? Is there an obvious
difference in image quality? And would either of these be all that different
from, say, a Celestron or Meade 8" SCT or 7" MAK or even the Orion 150mm
MAK?

.

Relevant Pages

  • Re: 1/6 or 1/8 wave
    ... The Deluxe was "guaranteed" ... to be at 1/8 wave, and the few I've looked at tend to approach that. ... What's the visual difference between 1/6 wave and 1/8 wave? ... from, say, a Celestron or Meade 8" SCT or 7" MAK or even the Orion 150mm ...
    (sci.astro.amateur)
  • Re: 1/6 or 1/8 wave
    ... The Deluxe scopes didn't _use_ Pyrex. ... Uncle Rod. ... that Pyrex mirrors will hold no better than 1/4 wave because of ... And even if you had 1/8 wave at the mirror surface, ...
    (sci.astro.amateur)