The design is kinda clever. It is called off-axis but it really isn't. An
object at the center of the field will be perfectly on-axis, from an optical
point of view. The scope works like an off-axis (there's that phrase again)
mask except there isn't any glass where the covered mirror parts would be.
The result, no coma in the center of the field.
-Leonard
----- Original Message -----
From: "Randy Muller" <randygmuller@No-Spam>
To: "The Astronomy Connection" <sf-bay-tac@No-Spam>
Sent: Monday, March 07, 2005 2:03 PM
Subject: p: Re: [TAC] Scope of confusion
> Peter Santangeli wrote:
>> I'm confused. I just read the S&T article on Orion's 3" off axis
>> reflector.
> ...
>> - (surprisingly!) less contrast
>
> I assume this is because it has more coma, being off-axis.
>
Received on Mon Mar 7 15:24:23 2005