Little Isadore Posted November 18, 2008 Share Posted November 18, 2008 Hi,How should a bright star appear at mag x120 if collimation is spot on? Link to comment Share on other sites More sharing options...
John Posted November 19, 2008 Share Posted November 19, 2008 Hi,How should a bright star appear at mag x120 if collimation is spot on?Depends on the type of scope - what type are you thinking of ?.John Link to comment Share on other sites More sharing options...
Little Isadore Posted November 19, 2008 Author Share Posted November 19, 2008 10" Dob, once i get to 120x and above stars appear as a tight (bright) fuzzy blobs, the blob enlarging as mag increases, if you know what i mean. I assumed that they should remain as points of light, but as i have not looked through any other scope i have nothing to judge against. You said that it depended on what type of scope, what would the differences be between different scopes? Thanks ken Link to comment Share on other sites More sharing options...
Little Isadore Posted November 19, 2008 Author Share Posted November 19, 2008 BTW I have been looking at the trapezium tonight, i could not see E and F, can you?ken Link to comment Share on other sites More sharing options...
Merlin66 Posted November 19, 2008 Share Posted November 19, 2008 ken,Just inside or outside your best focus position, at x120 magnification, you should see a uniform bright disk of light. The outer edge should be tight and sharp and not duller or brighter than the rest of the disk. In the centre you'll see the reflection of the secondary mirror as a black disk. This should be perfectly central, round and show no edge distortion.For a refractor, the view should be similar but without the central black disk.What do you see???? Link to comment Share on other sites More sharing options...
TheThing Posted November 19, 2008 Share Posted November 19, 2008 Um, I might be wrong, but surely you should see a bright disk surrounded by concentric circles evenly spaced that do not touch, or get nearer, one another or the disk?Edit - ignore me! Just re-read the original post. you get the circles as you move out of focus! D'oh! Link to comment Share on other sites More sharing options...
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