Why won't my refractor come to focus?

[Adz]

Hi all,

I have the Celestron c100 ed scope out now with the eyepieces that came with it and my own. I feel a fool, but using a diagonal in the focuser and putting ep's in the top of the diagonal, I cannot get any to come to focus on the moon?

It seems all their focus points are a little bit further than the focuser can possibly extend? Hopefully someone can shed some light on this, it is probably something really simple. It's a Celestron c100ed with an Antares dual speed focuser, diagonal is a pretty bog standard one. The objects nearly come to focus when the focuser is fully racked out.

I didn't know refractors needed extension tubes!?

Thanks,

[Adz]

Can anyone offer any advice?

[Caldwell 14]

Is it a 1.25 or a 2 inch diagonal? I have heard of people having the same isue with TAL 100RS using 2 inch

[Adz]

Hey its a 1.25" meade diagonal, just checking now. No idea why this is happening Was fine on the tal

[Caldwell 14]

I take it you didn't like the TAL

[Spoon]

my scope need the diagonal to focus so it might be that

[182570]

I had the same problem with my TAL with a 2"diagonal,will only focus with 2" eyepieces,won't come to focus with 1.25,but is fine with the 1.25 diagonal:confused:

[Donkeiller]

Get and extension tube, or pull the 2" to 1.25" adaptor out a little bit and tighten it up again.

I had the same problem with a Televue 32mm plossl on my Megrez 90.

Pulling the adaptor out 2-3 mm was all that was needed.

[Adz]

I have done a bit of research and thinking. I believe it might be because I was using a 1.25" diagonal which doesn't use up as much of the optical path as a 2". Nevertheless, one is on its way

thanks all