Hi folks, boy do I need your help! I checked the archives and did not find a specific answer to my problem. I use the Orion Deluxe Laser Collimator as my...
Last night I set up my TAK102FS next to the SP8 that was on a Celestron AS GT mount. I set both scopes up so that the eyepieces placement was such that I...
Just shooting from the hip here but it sounds like your secondary is badly miscollimated and not centered correctly on the focuser and the primary mirror. This...
It is possible that the focuser is mis-aligned and the secondary compensates (but not correctly) by directing the laser beam to the primary center, but since...
You sound like you're into observing the planets. Have you ever heard of Excelsior Optics? The man who runs the company specializes in long focus Newtonians...
I've looked through two ten-inch Discovery Dobs, one an F/6, and the other an F/4.5. Both demonstrated very good image quality, I own the F/4.5 and it shows...
Hello all, I'm new to the group and new to astronomoy. Soon I will be observing from my backyard through a new Hardin Dob. Looking through the photos, I am...
Hi Wayne, I too am contemplating going to the same setup. Can you share with the group the kind of performance you get with the scope? Any views that are...
Date: Tue, 15 Nov 2005 04:41:53 -0000 From: "ravyn10" <ravyn10@...> Subject: Re: P5130936 parallax 10 (mount) Hi Wayne, I too am contemplating going to...
Greetings all, I've just joined this group. I live in Chester, England and have an 8.5-inch f/5 Newtonian built in this country in 1988 by a now defunct firm...
I am not the moderator, but I will say welcome aboard anyway. I have my 8 inch mirror out of the cell at present hoping to send it off for re-aluminizing...
Sounds like you have a nice instrument, and use it frequently. I'm older and lazier now, so I don't observe as often as I want. That 8.5" will outperform what...
Thanks Wayne. Yes, the main difference I've noticed with the plate glass mirrors is that the images are awful for the first 1 - 2 hours after taking the ...
That's my experience also. I had a 10" with a plate glass mirror. Unfortunately, in those days, I rarely had the time to set up and let the thing cool...
Greetings all, I wonder if anyone can help me with a spot of advice. Recently I've been getting 'triple' images from my 8.5" f/5 Newtonian. I've had the ...
What eyepieces were you using? What altitude above the horizon were the objects in question? How cold was it and much thermal stabilization tim did you allow? ...
I should have stated that I began observations within about half an hour of setting the instrument up outside (tube assembly had been in a heated room). The...
Try rotating the eyepiece in the focuser to see if the image defects rotate with the eyepiece or stay stationary. What brand of Kellner and Ortho? -Chris...
Thanks Chris. The triple images always retain the same orientation, no matter what the position of the eyepiece. However, they are slightly different inside...
Okay, given everything you have said, I think I would be looking at possibly upgrading the 3-point suspension mirror cell to a 9-point cell. Hopefully other...
Thanks Chris. I feared you might say that! The flat is supported on a single strut across the entire diameter of the tube. If you are using ... Good idea. I...
... I guess we're assuming the axial collimation is good. Trilobal images, I usually suspect astigmatism (even if the symmetry is different inside and outside...
Vic, Thanks for your response. You may have hit on something here:- I've also seen cemented ... This telescope does indeed have a cemented flat. When the...
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