> The owner has put a lot of time and money into this, and we > would like to see some nice bright images. My limited experience with ~ .5 to 1 meter cassegrains with relatively poor optics (spec'd at 90% of light to fall within 1 arc second circle) suggests 1-2 magnitude loss. Lack of optical equilibrium, poor optics, poor baffling for visual use, and poor aluminizing are possible contributing factors. Is the field background anomalously bright? If so, check baffling. Do stars focus to a pinpiont (sounds like they don't)? If not, then optical or equilibrium problems. Mel Bartels
-- BEGIN included message
- To: atm@shore.
- Subject: Re: ATM Performance with Spherical Aberration
- From: root <mbartels@efn.org>
- Date: Mon, 25 Sep 2000 12:27:04 -0700
- Organization: Eugene Freenet
- References: <200009251816.AA28174@electron.nofs.navy.mil>
> The owner has put a lot of time and money into this, and we > would like to see some nice bright images. My limited experience with ~ .5 to 1 meter cassegrains with relatively poor optics (spec'd at 90% of light to fall within 1 arc second circle) suggests 1-2 magnitude loss. Lack of optical equilibrium, poor optics, poor baffling for visual use, and poor aluminizing are possible contributing factors. Is the field background anomalously bright? If so, check baffling. Do stars focus to a pinpiont (sounds like they don't)? If not, then optical or equilibrium problems. Mel Bartels
-- END included message