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nice competent review on cn



 
 
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  #1  
Old January 21st 11, 12:55 AM posted to sci.astro.amateur
Pierre Vandevenne
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Default nice competent review on cn

Much better review than one would find in standard astro magazines.

http://www.cloudynights.com/item.php?item_id=2572
  #2  
Old January 21st 11, 02:00 AM posted to sci.astro.amateur
Brian Tung[_5_]
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Default nice competent review on cn

On Jan 20, 4:55*pm, Pierre Vandevenne wrote:
Much better review than one would find in standard astro magazines.

http://www.cloudynights.com/item.php?item_id=2572


Yeah, it's not clear to me why the big magazines do not do
more detailed optical bench testing. Especially with the
advent of Web publishing (merely a 20th-century advance),
one could have the straightforward review in the printed
magazine, but have the optical details on-line. Unless they
cannot afford to perform the tests (which seems odd to me,
but possible), that kind of arrangement would appear to
address the negatives associated with bench testing the
telescopes reviewed in magazines.

Orion's asserted results of 1/3.4-wave P-V and 1/17-wave
RMS are kind of odd. That high a ratio--five to one--sounds
like a small but deep zone. If it were at all backed up by
the other tests, I'd have suggested searching for that zone,
but apparently it wasn't.

--
Brian Tung (posting from Google Groups)
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  #3  
Old January 21st 11, 04:41 AM posted to sci.astro.amateur
jwarner1[_2_]
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Default nice competent review on cn



Brian Tung wrote:

On Jan 20, 4:55 pm, Pierre Vandevenne wrote:
Much better review than one would find in standard astro magazines.

http://www.cloudynights.com/item.php?item_id=2572


Yeah, it's not clear to me why the big magazines do not do
more detailed optical bench testing.


(a) They have a vested-joint commercial interest?

(b) The world is flat?

(c) Wormley is a vampire?



  #4  
Old January 21st 11, 09:54 PM posted to sci.astro.amateur
Chris.B[_2_]
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Default nice competent review on cn

A sensible review. I remember David being one of the sensible and
observationally experienced posters here a few years back. It's nice
to know somebody is being more productive than hanging around here and
arguing with bloody-minded trolls.

I didn't much like the very wide page format of the review. It felt
rather like walking a tightrope once one launched oneself onto line of
text. I worried whether I'd ever reach the far end before falling off
onto a lower line like some cartoon character. :-)

 




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