Re: [ATM] Meade 'Fesses up

[Michael Peck <mpeck1@ix.netcom.com>]

At 23:34 1/29/05, vladimir sacek wrote:
>I'm still not sure what a "new advanced corrector plate" means.

That's marketing hype. It means whatever you want to read into it.

>comparable RC in both, astigmatism and field curvature. A 12" f/8
>system with f/2.75 primary and 0.35D min secondary size would

If you're trying to reproduce a commercial design try using an f/2 primary. 
If you're thinking about something buildable by an amateur of course this 
probably makes more sense.

>surface curvature. What doesn't fit in is that it would result in
>~20 micron blur at 0.25 degree off-axis, while according to
>Meade's illustration the blur size remains nearly unchanged
>(less than 5 microns) implying nearly flat field

Something tells me that's more marketing hype. That looks suspiciously like 
a spot diagram over a curved field. And of course they probably had a good 
reason not to show a spot diagram for more than one wavelength.

Mike Peck


------
Michael Peck
mpeck1@ix.netcom.com

_______________________________________________
ATM mailing list http://www.atmlist.net/