I have an older 15" f5 Starsplitter that I have owned for a year. For some time, more experienced large telescope users have been telling me that my scope...
Robert, Go to www.fpi-protostar.com/collim.htm EC ... From: "Robert Magnuson" <rmagnuson@...> To: <bigdob@yahoogroups.com> Sent: Saturday, April 01,...
As I understand it, lasers have an established role but use of single beam alone, or the barlowed laser alone, can miss some key elements to collimation....
I use a laser fairly often. But I also check my collimation with manual tools every once in a while or whenever I travel. I've seen the laser method fail...
Bob, ... Yes, in a sense. The most important thing with the Cheshire is what you don't mention - to see the distant reflection of the Cheshire's bright face ...
Michelle, ... I'm not one who buys telescopes often, but I'd go so far as to assume a newly bought Newtonian isn't even collimated! <G> Collimating, as well as...
... I think you mean "former"? ... It would be nice, but the amount of offset depends on several other factors, and not the secondary size, so the manufacturer...
hi John, I wrote ... Looking back I find my references aren't as clear as they should be: In "The former is more desirable, the latter is more common", "the...
I believe Vic Menard has already alluded to the fact that in order for offset away from the focuser to make any sense you need to first assume all the...
... You really shouldn't use the return beam to collimate the primary mirror unless it's Barlowed. Any error where the beam reflects from the primary mirror...
Dale, ... No, not really (and I've said so too!) - with the exception that some digital setting circles *may* be sensitive, this has at least been claimed. ...
... It depends on how much offset we're talking about, and how close the other mechanical "approximations" actually are. For instance, with my 22 f/4.1, the...
Nils, thanks very much. Especially your note about the view of the secondary versus the Cheshire crosshairs. This point had caused me much concern, but I can...
First off, thanks to everyone who has responded. I learn a little more from each posting, and at the same time, I can see that I am working in the dark more...
Robert, If you go to www.fpi-protostar.com/collim.htm it will show you exactly how things should look thru a good Chesire. If you will print this and use as a ...
... But interestingly enough, the return beam is now a projection of the primary mirror center spot! This silhouette reflection can be used on a perforated...
... I have to disagree. I have built a stepper system too for my home built 16 inch dob. I control the scope system with another laptopt running a planetarium ...
Thanks, Vic Believe me, it has been both a joy and a frustration to learn to use this big dob without some hands-on help. You make some good points, and I will...
Is a Cheshire the same as an autocollimator? I bought an autocollimator from astrosystems and wonder if it together with a Kendrick laser I own is enough? Mike...
... Definitely not -- an autocollimator (a terrible misnomer) is a device that contains within it yet another (perforated) mirror, and extends collimation ...
Hi Mike, For an informative discussion on the functionality of passive collimation tools, check out: http://www.catseyecollimation.com/passivtls.html Regards,...
... Assuming that the secondary is well placed in the light cone from the primary, collimation calls for *two* things to be done: one is aiming the focuser at...
hi Jim, ... I've tried my hardest - even by figuring out as exactly as I can what it does: http://web.telia.com/~u41105032/Acoll/Acoll.htm (which, as far as...
In my understanding of Vic's "Carefully Decollimated Protocol" using the autocollimator, the Primary and Focuser errors CAN be evaluated and corrected...
... Well, you left out the first step, which is where you actually carefully decollimate the primary mirror (although, once you're comfortable with the...
It seems that the limiting factor in the use of any collimation tool is how well a telescope will hold its collimation throughout the night as the telescope...
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