Re: ATM buying the secondary

[Stephen Tonkin <sft@aegis1.demon.co.uk>]

Nik Cain <N.J.Cain@sheffield.ac.uk> wrote:
>
>Hi, I've been looking through the archives and saw that buying rather 
>than making the secondary was an easier option. I've got the 
>catalogues for Ealing and for Newport, and it looks like Ealing is 
>the cheaper company.

Ealing, which is the UK outlet of edmund Scientific, is *very*
expensive. You can get good diagonals from Norman Oldham or Vacuum
Coatings. (Addresses on my UK suppliers page.)

Norman Oldham's can be very good indeed. 

Stephen Tonkin
(N50.9105 W1.829)
   
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UK Amateur Telescope Making - <http://www.aegis1.demon.co.uk/atm.htm>