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Old 16-07-2019, 03:37 PM
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Bobbyoutback
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Join Date: Oct 2009
Location: Broken Hill
Posts: 361
Dobson

Quote:
Originally Posted by astro744 View Post

Don't get too hung up over the numbers. A quality mirror maker will guarantee a first class mirror whereas mass produced makers can put whatever spin they want on the numbers. Don't get too hung up on Strehl either. I've seen a Rhonchigram of a mirror showing a clear defect yet reportedly had a very good Strehl! It's just another way to spin the numbers.
Thanks Astro744 ,
Your reply post had some good information 'especially that last part !
Do you remember the cost of getting your 10" f6.4 refigured ?

I particularly like the way John Dobson reads a mirror in his video , starts at 1.19:55 https://www.youtube.com/watch?v=snz7JJlSZvw

Cheers
Bobby .
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