Sponsored By:

Subject: [M]: AW: Re: OT Help! -- Meade 16" Mirror
From: Ferth Roland
Reply To: mapug@shore.net
Date: Mon Mar 02 00:10:49 1998

The increase from a 16" with 89% coatings to 96% coatings would be 0.06
mag.

Roland

>----------
>Von: corelli@juno.com[SMTP:corelli@juno.com]
>Gesendet: Samstag, 28. Februar 1998 14:27
>An: mapug@shore.net
>Betreff: [M]: Re: OT Help! -- Meade 16" Mirror
>
>Sorry this is OT, but I need some good advice. I just discovered that my
>Meade 16" Dob's primary mirror has rather severe "spots" on it indicating
>it needs a new coating. I tried to clean the spots, hoping they were
>*merely* dirt, but to no avail. I just pulled the scope out of the
>garage for the first time in 5 months and noticed this problem. I now
>need to have the mirror re-coated, but know little about this. I've seen
>QSP in the back of S&T and their prices indicate $120 for 89%
>reflectivity, $220 for 93% reflectivity, and $320 for 96% reflectivity.
>About a year ago I had them re-coat the secondary mirror with 96%.
>Anyway, my FIRST question is: How much of a real difference will I
>notice between 89%, 93%, and 96% reflectivity (Obviously money is an
>issue here). My SECOND question relates to another company that uses
>Beral Coatings, also advertised in the back of S&T. The prices are
>significantly less, yet I don't know if I'm losing a lot in quality. I
>also don't know the difference between Beral coatings and aluminum
>coatings. Any advice would be greatly appreciated.
>
>Thanks,
>
>Todd
>
>_____________________________________________________________________
>You don't need to buy Internet access to use free Internet e-mail.
>Get completely free e-mail from Juno at http://www.juno.com
>Or call Juno at (800) 654-JUNO [654-5866]
>
>