... time ... Glenn, This is part of an article I am writting for Amateur Astronomy hope this helps. Michael The size of your clear aperture is determined by a...
1 radian = 57.3 degrees. For small angles (measured in radians), the Sine or Tan of that angle equals approximately the value of the angle. 0.1 radians equals...
Hi. I'm planning to have a truss scope built using either of the above mirrors from Discovery. I like the f/4.1 because it is more compact (I'm not a big guy...
I personally would not go with anything less than 4.5 and recently bought my Obsession 20 over the 18 because it was an f5 and not an f4.5. Collimation gets to...
... <zambianco@n...> wrote: It is a week now since you posted and you still haven't gotten any answers, so we would like to hear what you think. MY guess would...
Hi, As you probably suspected, the f/5 will be much easier to collimate than the f/4.1. I forget the numbers (look for Nils Olaf Carlin's web site on...
<<<Hi, As you probably suspected, the f/5 will be much easier to collimate than the f/4.1.>>> I hear a lot of people say that but that is not really true. ive...
... Gene Baraff First I need to make it clear that I am NOT trashing Niles idea. If fact I think it's a good idea for those that can't get the grasp of the...
... ratios) then I think that's the point though, the tolerances double between f/4 and f/5, with f/5 a single pass of collimation is probably good enough, ...
I was speaking from my experences more then anything else. the 10" F3.95 I built with swayzie optics. when I use the tectron tools the collimation comes out...
... I have directly compared the collimation of my Obsession 15" via the Barlowed Laser (after Tectron sight tube centering of the 2dary and placement of the...
I find it interesting that folks seem to be comparing the differences between the many different methods and devices, but no one has done the most important...
... differences ... the ... test ... To be very honest, I live in central Florida and in the five years I've been in this hobby (last 3 I have a pretty good...
You may have to have this made by a machine shop. Take your scope preferably to someone who owns a machine shop and is into astronomy and it will make it...
Michael, Bob Bunge makes a good point that there's not much value to increased collimation accuracy beyond what makes a discernable difference at the eyepiece....
... Since there is no difference in the collimation "picture" yielded by the BL and the Catseye Cheshire, I do not see how to answer your question. Steve...
... Hi, I'm recently back from traveling, and haven't been able to comment before. If the cheshire's peephole is centered in the focuser, and the Barlow is not...
Attn: big dob users/owners: My local astronomy club is working on acquiring a 30" class Dob for the club's use. At a meeting of the task force recently, we...
... I guess you have a case of confusion over secondary offset. No matter what you do, something will be offset, but you have the choice of what. Do you refer...
... <nilsolof.carlin@t...> wrote: Hi Nils Olof, and everyone who replied - I sicerely appreciate your great responses! A fellow club member has a 12.5" dob,...
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