6501Re: Megrez vs. ZenithStar Family
- Dec 29, 2005Let me take a stab at this, remember this is just my opinion and
it's worth exactly what you paid for it ;^) My comments will be
after each of your questions below
--- In William-Optics@yahoogroups.com, hypergut <no_reply@y...>
> To All:
> Having been smitten with the ZSSD 66 APO, I am looking at more
> "refractor" APO aperture for my future, i.e., 80mm or greater.
> Can anyone clearly outline the advantages and qualities of the
> members of these two design groups, Megrez vs. ZenithStar Family,I believe they are just different styles with pretty much equal
> e.g., is one design better for imaging versus visual use? Physical
> properties (other than weight)? Mechanical differences? Optical
> The Megrez 80mm FD is it a fluorite achromat, semi-apo or apo?
> The other members are apochromats, correct?
> What advantage has the Megrez fluorite Triplet Apo over the Megrez
> 80mm IIED Apo? What advantage has any 80mm Megrez design over the
> 80mm ZenithStar 80mm fluorite doublet (the so-called redtemptress).
Better color correction of the Flourite Triplet over both 80IIED and
> Is the 80mm ZSFD an apo?Yes
> Unrelated to my past or future purchases, but maybe helpful to
> why would someone choose the ZS66 Petzval Semi-Apo ED or the ZS66Petzval is a semi-APO, but because of it's design, it has a very
> Triplet ED-Apo versions over the ZSSD 66 Apo?
flat field which is great for Astrophotography. The triplet should
have the best color correct of the three. The SD APO is a doublet,
which gives it a litter weight and quicker cooling over a triplet
but still have good color correction.
Clear as mud now? Hope this helps Robert, Chris
> Curious Minds Want to Know!
> Robert in Hershey
> P.S. as you can see, I now own cadioptrics, refractors and a big
> 18" f4.5 Obsession, Galaxy/AN (with ZSSD 66mm Apo superfinder)
> 8" f10 Meade LX90 SCT
> 5" f10 Intes-Micro Mak-Cas
> 4.7" f6 Orion Astroview 120ST Achro
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