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Still having viewing problems

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Still having viewing problems

Postby esa20 on Sat Mar 21, 2009 12:27 pm

After using my telescope for a few months with the 30x erecting eyepiece, I bought a 7.5 mm eyepiece. With a focal length of 700mm, that works out to about a 93x magnification, but there seems to be not much of a discernable difference between what I see in the 30x eyepiece. For example with the 30x eyepiece I can faintly see a disc surrounding saturn. The thing is, with the new eyepiece, I can still only see the same thing. Another thing that I have noticed is that in order to be able to see anything at all, I have to turn the focusing knobs such that the focuser tube is all the way in in order to see anything. Otherwise, all I see is a furry blob with the "spider" extending from it and an dot in the middle. I know with an aperature of 76mm I'm not going to be able to see deep space objects, but I think I should be able to see more detail than I can see. Are my mirrors misaligned or something?
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Postby Jne_K on Mon Mar 23, 2009 6:04 am


That's all you will se with any eyepiece on Saturn, right now, since the rings are currently edge on to us, due to Saturn's current position in its orbit. Saturn's rings won't open up to nay great extent for viewing for another couple years. To really see the rings at their best when the rings are more visible, you should try to get up around 120x with that small a scope, but don't go higher or you lose image quality. Jupiter, later this summer, will be a much better target for your small scope.

That is normal for focusing with a reflector. Reflectors have a very short travel distance in the focuser and there will only be one point where things are in focus. The higher the magnification, the more critcal the focus point.
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