Re: [APML]: 500-700 mm range

[mark.kaye@sympatico.ca]

>     I read with interest your comments on the Cervalo telescopes.  I am
>not familiar with them, could you elaborate?  What aperture, f-number
>and optical design does he use? 

   Peter makes a line of Newtonian Maksutovs.  They use a Mak corrector in 
what otherwise appears to be a regular Newtonian scope.  Instead of a 
silvered spot on the back of the corrector, a 45 degree mirror is employed to 
send the light out to the regular side focus.  The HD145 has a 145mm aperture 
and comes in two focal lengths.  F4.5 with an enlarged secondary for 
photography or visual and f6 with a small secondary strictly for visual work. 
 The HD216, as far as I know, only comes in the visual variety and is an f6.
   We own a 13cm AP refractor.  When I first looked through the HD216, I was 
very impressed.  A good friend of mine owns a photo version of the HD145 and 
it gives excellent results.  Anyone who has seen the Hyakutake video has also 
looked at results using one of these scopes.
   Clear skies!
               MK

http://www3.sympatico.ca/mark.kaye/