20344Re: Need focal reducer help!
- Dec 2, 2003Thanks Mark. I think I'm going to use a Celestron ST80 guide
scope mounted piggyback for the larger objects (with the AO-7
removed), and use the .63 reducer/AO-7 with the C-14 the rest of the
time. Appreciate the help from everybody who responded!
--- In email@example.com, "Mark de Regt" <deregt@e...>
> You can't use a Meade .33 reducer with the AO-7--the distance istoo great
> from reducer to chip, and you won't be able to focus (even if youcould, the
> distortion would be horrible).I don't
> The .63 reducer should work; it does with my LX200 with an AO-7.
> know about the optec filters, except that I understand that theywill not
> work with the CFW-8.focal
> Mark de Regt
> Redmond, Washington, USA
> 47.7 N. Latitude; 122 West Longitude
> Astro Images: http://home.earthlink.net/~akilla/MAD
> > -----Original Message-----
> > From: uwpf23 [mailto:uwpf23@y...]
> > Sent: Sunday, November 30, 2003 8:29 PM
> > To: firstname.lastname@example.org
> > Subject: [ccd-newastro] Need focal reducer help!
> > Hi,
> > I cannot achieve focus with a Meade F/3.3 focal reducer used with
> > the following:
> > 1) Celestron CGE-1400 OTA. 3910mm focal length @ F-11 when no
> > reducer used.first,
> > 2) CCD setup is an ST-7/CFW-8/AO-7 all attached together.
> > 3) JMI SmartFocus elecric micro-focuser.
> > I've tried the following already:
> > 1) Mounted the reducer directly onto the visual back of the OTA
> > then attached the JMI, then the CCD gear. Racked the Celestronway
> > main focus knob all the way clockwise (mirror moved all the
> > back toward the rear). The image was moving toward focus, butgear.
> > could not get all the way focused.
> > 2) Mounted JMI focuser first, then the reducer, then the CCD
> > Same result.eyepiece and
> > Note: I CAN get focus with the F/3.3 reducer through the
> > a star diagonal visually (NO CCD attached).the
> > Is my problem that the focal reducer lens is too far away from
> > CCD chip with all the gear attached? Or, is it too close to theCCD
> > chip? It seems from the visual eyepiece check that the reduceris
> > too far away from the CCD chip. I can't get it any closerwithout
> > removing some of the CCD attachments, which is not feasible forme
> > (can't do without the color wheel or adaptive optics).specific
> > Anybody have any ideas on what the cure for this is? If this
> > focal reducer is incompatible, anybody have any suggestions forbrands
> > that will work and are faster than F/6.3 (already have a .63 fromthis
> > Celestron that works fine--just need shorter focal lengths than
> > with such a long main focal length to work with!). Would liketo get
> > down to at least F/4 or 4.5 if possible, as F/6.3 just is nothttp://docs.yahoo.com/info/terms/
> > desirable with some objects on the CGE-1400.
> > Thanks for any help you all can give me on this!
> > Clear skies,
> > Wade Van Arsdale
> > Little Rock, AR.
> > (Registered NewAstro Customer)
> > To unsubscribe from this group, send an email to:
> > email@example.com
> > Your use of Yahoo! Groups is subject to
- << Previous post in topic