8"ACF, AR152, ED100, ST80, EQ6Pro, Duo-T, AZ3, EQ1
Mes télescopes et jumelles:
150mm F5 Newt on EQ5, 127mm Mak Cass on AZ4
Oberwerk BT70-45 and 15X70 SkyMasters
Barnard Astronomical Society
David Cotterell Toronto, Ontario "If an observer actually sees an object, there is no point in referring to a formula to find out whether he ought to see it; and if he fails to detect it, no formula will ensure his success." - W.H. Steavenson 8" f/15.5 TEC Maksutov 16" f/5 Teeter/Zambuto Dob 66mm WO SD AT 65EDQ APO Refractor Astro-Physics Mach 1 GTO Mount iOptron ZEQ25 mount Canon 60Da
Quote:The obvious solution is a Dob mount... This was discussed in a duplicate thread in the reflectors forum. Alt-Az mount for an 8 inch F/5 The scope is a little short for an Dob mount but the base can be easily raised.I have an 8 inch F/5, I tried it on my Stellar-Vue MG-2, it was OK but it was awkward reaching around the tube to use the slow-motion controls. Jon
Quote:Sorry guys but I am not familiar with these secret codes;Duo-TEQ5DM6Help please??
Quote:A dob mounting that is raised via legs or a taller rocker box is a darn good solution.But not if someone wants slow motion controls. Or does not want the rocker box mount.All possible options are a set of compromises.
Quote: Quote:A dob mounting that is raised via legs or a taller rocker box is a darn good solution.But not if someone wants slow motion controls. Or does not want the rocker box mount.All possible options are a set of compromises. All true. In my experience, using my 8 inch F/5 on StellarVue MG-2, because of the short tube, I had to stand on the side away from the mount and reaching the slow motion controls was awkward, I had to reach around the tube. It is certainly easier to make a rocker box mount stable than a tripod and balance is easier, no one sided mountings. I have often wondered how one would go about designing slow motion controls for a Dob. My thinking:Any alt-az mount that is sufficiently stable to handle an 8 inch F/5 Newtonian at higher magnifications will cost more than an entire 8 inch F/6 Dob. Just buy the Dob and be done with it. Jon
"Great men are forged in fire. It is the privilege of lesser men to light the flame." --John Hurt, as The War Doctor12" f/4.9 Skywatcher Collapsible Dobsonian8" f/4.9 Orion Newtonian on alt-az mountOberwerk 15x70 BinocularsMinimalist Eyepiece Collection: 30mm ES-82, 22mm Vixen LVW, 14mm Delos, 10mm Delos, 7mm Pentax XW, 2X GSO 2" ED Barlow, 3X Explore Scientific Focal Extender, 4X Powermate
Quote:"But better still, build a pipe mount. Then you get to use it under more than one scope. "The problem with a pipe mount it that it's getting harder and harder to find pipe that does not have tapered threads. I 've tried a couple of pipe mounts with poor results. The tapered threads make it very difficult to get the tension properly adjusted and severely limit the range of motion. Even with a very light scope (ST80), I found that either the ALT motion was so loose that the scope wouldn't hold position or that it was too tight for smooth operation. The AZ motion was severely limited by the tapered threads as well. If you could find the straight cut pipe, you might create a decent mount, but even then, an 8" reflector, 40 inches long is a substantial scope and I doubt you'd be happy with it's operation, even on a decent pipe mount.
SCOPES: CPC1100; AT66ED; EdgeHD 8";SVR90 RAPTOR MOUNTS: CGEM; Vixen GP2; iOptron Sky Tracker; Celestron AVX CAMERAS: Canon 60D;Lodestar EYEPIECES:31T5;D14;D8;P20;P25;P32;TMB9 The Lord sits enthroned above the circle of the earth...He stretched out the heavens like a canopy.
Quote: Duo-T looks nice. I wouldn't mind having something like that for my ES Comet Hunter Mak Newt.Patrick
Quote:PAT AT HOME how much do the counterweigths weigh on the duo-t when using the 8"?