my scope wont focus properly

[smt1988]

my telescope focuses weird i tryed it on jupiter this morning and i could get the planet focused but next to it was a blob of of light like a halo any one no whats wrong ?

[nightfisher]

what telescope is it, and could the blob be one of the jovian moons

[smt1988]

its a sky watcher heritage 76. nah its kinda like the brightness from jupiter is making a circle shape similar to the planet appear right next to it if you get what i mean

[nightfisher]

sounds like it might be collimation, but im sure some else will make a better comment

[tomw28]

I agree that it sounds like a problem with collimation. However I used to have the Heritage 76 and there's no easy way to collimate it. The only thing I used to do is completely defocus, preferably on a star. Failing clear skies, I used to light a candle in a dark room and defocus on that from as far away as I could. Then use the three screws behind the secondary to try and get the shadow of the secondary in the middle of the defocused circle of light. It's by no means perfect, but it did improve the quality of the image I was getting with that scope.

Hopefully someone will have a better solution, but if not give that a try. Good Luck!

[evilgeenius]

I had something similar last night and It went away after I cleaned my eyepiece and removed the condensation. There was a transparent circle about twice the size of jupiter which covered it.

[smt1988]

cheers tom il give that a try.

evilgeenius - i cleaned the eyepiece was still the same after.