Hi Group, I have a basic question about scopes and mounts. I have an 8" reflector (says Skywatcher on the side) on a CG-5 mount with Autostar retrofitted....
Is it the same with looking southeast as well as southwest. That is, does it matter which side of the polar axis the telescope is? I'm wondering if you have a...
In a message dated 4/24/2008 8:10:55 PM Pacific Daylight Time, ... If the jerk is reasonably periodic (happens approx. every N minutes) it is a problem in the...
Thanks for the thought Larry. I'm not sure but I think anything south of the zenith causes a jerky condition. I'll check the next time I'm out. I'm not sure of...
Thanks Mike, I agree that it's probably in the RA drive system. I don't think the gearing is slipping but the axis is binding and releasing. It jerks every 3...
Hi, I am happy to have found this Group and become a new member! I am seriously considering to assemble a lightweight fast f/4 16 to 20 inch Newtonian of my...
I don't know your budget, but Discovery Telescopes is considered a manufacturer of quality optics, and they sell Dobsonian telescopes up to the 20 inch size. ...
Larry, Thank you for your reply and referral! Discovery Telescopes are new to me and their interferometry tests are most assuring of quality. My budget is...
In a message dated 4/29/2008 5:31:47 AM Pacific Daylight Time, ... John - welcome to N_R. There are several important considerations in choosing a design for...
Mick, Thank you for your welcome and wealth of most helpful information. I spent many hours checking out the links and suppliers that you mentioned….as well...
You are, no doubt, aware the sine qua non of imaging is a steady mount with smooth and accurate tracking - one that is still steady fully loaded. -William ... ...
John-secondary sizes and collimation are not different from Richeys, and for fully illuminating large chips typically run 40% for 10 to 16" scopes (...
... WG: John, since you are installing this in an observatory, I would think cooling to be a more relevant factor than being lightweight. If possible, I would...
RE: "WG: John, since you are installing this in an observatory, I would think cooling to be a more relevant factor than being lightweight." Weight is always a...
John- I respectfully disagree with Wayne-the shorter tube is easier to mount and logistically deal with, and coma is a non problem with a Keller or Wynn...
William, Thank you for the heads up on an imperative quality mount! I have a Losmandy Titan that has proven itself to track very well with a C14, 3"...
Charles, Your vote of confidence for Royce mirrors is reassuring! I tend to agree too that it is no easier to perfectly collimate an RC, SCT, or fast...
William, Excellent points to consider! Thank you! All the more reason reinforcing my decision to get a fast f3.8 mirror. I truly appreciate the input from you...
... Could someone point me to a good primer on the "how to" of collimation and the relative merits of laser collimation over visual collimation? TIA Randall ...
Randall, As I understand it, laser collimators can get collimation pretty close to perfect. But only final collimation on a star near the zenith during a night...
In a message dated 4/30/2008 10:22:47 PM Pacific Daylight Time, ... Randall - John's reference to the Thierry Legault site is an excellent one; site is...
Greetings All: Our free special technical report entitled, "10 Critical Elements of Dobsonian Telescope Drive Systems" is now available. If you would like to...
Hello Group : I'm a new member and I have a bunch of questions about my 8" f6 Newt Telescope. I wanted to attach a picture of the focuser I use, or do I have...
Check out Jim's Mobile for reasonably-priced replacement focusers. See http://tinyurl.com/42to8y (http://www.jimsmobile.com/buy_rcf.htm) for example....
I noticed in the home page of the Newt. group, there is an excellent picture of a 10 or 12 " Newt. Or those Tube rings on the Newt. and where can I get some...
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