Dale, ... I should have said "during the tests" instead of "rather late in the proceedings". It's quite reassuring to know that your findings confirm this...
Hi, I have uploaded the resuls for a sling exactly placed at the centre of gravity. The difference with a sling misplaced by 2.5 mm are also shown. ...
Hi folks, Newbie here. As I patiently wait for my dob to arrive with the Telrad finder I have been searching for a good sky chart that incorporates Telrad...
Mark, ... Whichever charts you wind up getting, you can always copy a set of circles of the appropriate size onto transparency film (assuming you can still buy...
I like the Deep Sky Reiseatlas! It has printed Telrad circles on the charts, 666 objects with short description and is laminated. Only in German, no English...
Hi Mark, I learned to star hop using Pennington's book and highly recommend it! Stephen's suggestion for Sky Atlas 2000 would be a great addition, it does...
I've been star hopping for a while now and do not use any electronic aids (eventhough I have a computerized GOTO scope, the electronics never get turned...
Here is a link to some other telrad finder charts. I use these and find them quite good. Pat http://www.duchekconsult.com/telrad_finder_charts.htm ... Hi, That...
Would it be OK to store my scope in my shed as long as its kept clean and dry or will the cold Illinois winter cause the mirror to crack or become damaged? ...
Hey all. Thought this would be a good place to ask this question. I know its been debated what a "big dob" is. But here's a similar question. I'm trying to...
this link on which give a comparison to what you will see with different sizes. http://www.seansastronomyshop.com/help/telescopeComparison/telescopeComp ...
... Hi Steve, Remember that Messier found all of the objects in a 3" retractor. Sure the sky's were darker but still.. I have a 18" F5, a 8" and 10" SCT, a...
The mirror will be fine, but you should put a tarp or other cover over the scope to keep the dust off. Not only keeps the dust off the outside, but will...
It depends of what he wants to see and the quality of the nightsky. I have a Celestron C90, an 8 inch Popp-Maksutov and a 12" and a 20" Dob. I had a 6 incher...
And you might want to put a 15 watt light bulb in safe, close proximity to your mirror cell. The tiny bit of continuous warmth provided by it will help keep...
8" is a life-time scope, in my opinion. A nice 8" reflector like the Orion XT8. If he really wants go-to, but not go-to but DSCs - push to where it tells you...
It depends entirely on the darkness of his skies. From a mag7.0 site (grey on lightpollution maps) a 70mm refractor can give dazzeling views of widefield...
One consideration no one has mentioned yet is experience of the observer. Many experienced observers can see more detail in a small scope than a "newbie" will...
Found this link on another forum, which was interesting: http://www.usatoday.com/tech/science/space/2007-11-02-darksky_N.htm? loc=interstitialskip Kyle...
Smaller scopes get used more often than bigger ones. This is especially true of beginners who have no idea about the work involved in transporting, setting...
Good point. But if he's a guy and reasonably healty, get the XT8 for $400 and add DSCs later if wanted. Then, you'll be gathering more than 3 times as much...
Here is another analysis concerning the problem already pointed out by Nils Olof Carlin http://web.telia.com/~u41105032/sling/sling.htm here are the results. ...
Mauro, Very interesting! Please forgive my critical attitude, but it's hard to tell whether your results are meaningful. You apply an out-of-plane load on a...
... I understand but the point is that: 1) i tooks 60 seconds to add the two loads and see what happens (less than writing the post in the blog). The...
Mauro, ... That is exactly my point: you haven't taken the time to make the analysis really as meaningful as it could have been. ... For my previous analyses I...
... Advantage of piano wires and rollerskate bearings is, that, once they are positioned at the right place, they stay there. When I place my mirror in the...
... I have the results for piano wire support (let me the time to put them onto the blog). However 120° is not the best choice. +/-45° seem good and maybe...
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