Gabe

On 15/06/2019 at 04:30, Ricochet said:

Now that you know to always use the diagonal in the focuser, I don't think you really have a problem as it seems that your eyepieces reach focus. If you're wanting to use the telescope without the diagonal then you will need an extension tube rather than a barlow.  I think the light path of a 1.25" diagonal is usually around the 65-70mm mark so you will need an extension tube of this sort of length to replace the diagonal. 

If you want more magnification then the 10mm and 2x barlow is probably going to be too high for your telescope. An 8 or 9mm eyepiece might be the limit.

Ok, thanks. I didn't even know that there was a such thing as an extension tube for a telescope. My only remaining question is why this is happening? I mean, how could a big company like Celestron make a scope that couldn't even focus onto Jupiter? 

Hey, I wanted to say thanks too all the people who have helped so far. I would also like to thank michael8554 for telling me that the THING is called a diagonal 😆 

I was wondering, if I got a Barlow lens, would that help my problem? 

22 hours ago, cletrac1922 said:

Gabe

Have you tried using any other eyepieces

With my 10" Dob, have issues viewing Saturn and Jupiter with 10mm eyepiece

When use 17mm, even 25mm 

You using 1.25" or 2" eyepieces

I found also was not able to focus using 2" barlow, and not an issue with 1.25" barlow

John

 

I have 1.25" eye pieces. I only currently have two eye pieces, one is the 10mm, the other is a 20mm. I am relatively sure that I would have tried that eyepiece but I can't remember. I'll try that when the sky decides to clear.

I have a Celestron Astromaster 90. Last night, I went to go see Jupiter, and with the 10mm eyepiece and the *angle lens?* (not sure if that's what it's called, but it's the thing that lets you look through the telescope from any direction other than straight through, mine is at a 90 degree angle) I got a decent image, although I don't have a Barlow, but I was able to discern the larger cloud bands and four moons, but the focuser was almost all the way out. When I took the thing* out, I was unable to focus on Jupiter at all. I could hardly see the moons and Jupiter was a massive white blob. I am an amateur and have no idea what's going on. If anyone knows what's going on and/or how to fix it, I would greatly appreciate it. Thanks!