Thread: Orion's "apo"
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Old August 13th 03, 05:56 AM
Chuck Taylor
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Default Orion's "apo"

wrote in message
news

http://www.telescope.com/jump.jsp?it...ath=1%2C2%2 C
4%2C13&KickerID=237&KICKER

Interesting variation on normal Chinese focuser. This is probably a
good idea. I figure if Stellarvue can claim improved achromatism
for their 80mm (with the latest Dyer review in Sky and Tel
"confirming" it) there is definitely room for another scope to bridge
the gap between the Chinese achros and overpriced
American/Russian/Taiwanese made products.
-Rich


It will be fun to watch.

Regards SV, the problem is you never know what Stellervue is doing to reduce
the color. For a while they were stopping down the aperture (see Ed Ting's
review). Then they went to applying an MV coating to the objective and
calling it a "proprietary" and "attenuated design" rather than admitting
they were filtering it. The last SV I saw had an MV filter applied to the
objective, but the owner insisted it didn't because SV had told him so.

Aside from filtering or stopping down the aperture, unless you use different
(and more expensive) glass, you aren't going to reduce the color, regardless
of the "zonal control" g you achieve.

Clear Skies

Chuck Taylor
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