RE: [ATM] Loveday alternative to Cassegrain

["Donald Good" <donald.good@comcast.net>]

See inserts below.

> -----Original Message-----
> From: atm-bounces@atmlist.net 
> [mailto:atm-bounces@atmlist.net] On Behalf Of Richard F.L.R. Snashall
> Sent: Sunday, January 16, 2005 8:00 PM
> To: atm@atmlist.net
> Subject: Re: [ATM] Loveday alternative to Cassegrain
> 
> 
> >
> > primary: R=-2400mm, K=-1.096, 800mm to secondary
> > secondary: R=-900mm, K=-1.927,
> > primary to final focus: 843mm
> 
> 840??

I got 840, too

> 
> >

> 
> How does this change the original complaint about the Loveday, i.e.:
> the ratio of the light diameter at the second pass 
> into/to/upto the secondary to the secondary is roughly 
> limited by the ratio of the secondary shadow on the primary 
> to the primary?
> 
Do you mean diameters (D) for hole (h), primary (p), and secondary (s) are
related by:
Dh/Ds ~= Ds/Dp
??

> One disadvantage; you can no longer ignore that hill in the 
> center of your primary;-)
> 
Thanks,
Don

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