If you cannot find a Traveler, there is also the Tak FSQ106. I have seen a few of these on sale on Astromart for quite a significant discount. These have a flat field and are made to be astrographs, i.e. built in camera rotator, large focuser etc. With some of the other choices, you will have to add a field flattener which might not be available, and for 6x7cm fields, a field flattener is a requirement. It has been reported by some that the FSQ has noticeable light drop off in illumination. As such for very deep exposures, you might have to apply anti-vignetting masks to remove this. Loke > > From: "Mike Connors" <micon@starband.net> > Date: 2002/03/27 Wed PM 03:00:27 EST > To: <astro-photo@seds.org> > Subject: Re: [APML] Medium format wide field scopes > > Glenn, > > I called Anacortes just a bit ago. They're in-state for me, got my current 'astrograph' there. > Not much more info. I'll wait for more intel on this one. > > Mike > ----- Original Message ----- > From: GLENN SHAW > To: astro-photo@seds.org > Sent: Wednesday, March 27, 2002 11:38 AM > Subject: Re: [APML] Medium format wide field scopes > > > Mike: > > I heard Williams optics surpass Borg optics. But I also heard Chevys surpass Fords, which is not evidently true. > > The guy who made that comment, however, had owned both and was a good optician. > > I also heard that the older Russian made ones were supposed to be better. > > They are supposed to be apochromatic. Check it out. > > glenn > >
|
Glenn,
I called Anacortes just a bit ago. They're in-state
for me, got my current 'astrograph' there.
Not much more info. I'll wait for more intel on
this one.
Mike
|