[ATM] 6 inch mirror blank

[tom bouthillier]

Thanks. I'll have a look at it but I'm planning to use the concave surface already there ( and keep as close to the existing thickness as possible). The title is wrong --- I originally started out as thinking I would make a rumak but the gregory would be easier to build without too much of a hit on performance.

 

As far as using the pyrex I have - I got answers that, pretty much, are the battling two sides in my head.  I think I'll go ahead an use it. I know it's not a huge amount of money for a new one but the total cost of my hobby is causing some friction with my other half. I got a hold of another aerial camera (it's twin) for a song and I think I'll make a pair of Mak binoculars . I think I'll make the  mirrors  last so, If a sale comes along, I can change this.

Thanks

 

 

   
> From: vla at copper.net
> To: atm at atmlist.net
> Date: Sun, 19 Sep 2010 12:06:29 -0400
> Subject: Re: [ATM] 6 inch mirror blank
> 
> tom bouthillier wrote:
> 
> > I've managed to get a 6 inch piece of SK15 from an old aerial camera that 
> will work as a corrector for gregory maksutov. I'm attaching the OLSO file 
> if anyone is interested. <
> 
> I can't get working design with those numbers; it looks like Rumak, with
> the secondary farther away from the primary than the corrector.
> 
> Here's what 6" f/15 Mak-Gregory with 14mm thick SK15 corrector and
> 1013mm primary radius would look like.
> 
> SRF RADIUS THICKNESS APERTURE RADIUS GLASS SPE NOTE
> OBJ -- 1.0000e+20 8.7269e+17 AIR
> 
> SRF RADIUS THICKNESS APERTURE RADIUS GLASS SPE NOTE
> OBJ -- 1.0000e+20 8.7269e+17 AIR
> 
> AST -224.000000 14.000000 76.000000 AS SK15 C
> 2 -232.980000 399.000000 77.903069 S AIR
> 
> 3 -1.0128e+03 -399.000000 82.610364 S REFLECT
> 
> 4 -302.000000 544.000000 22.227740 S REFLECT
> 
> IMS -311.000000 0.488351 19.978282 S
> 
> Vla 
> 
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