Eyepiece Extension??

hello all,
I have a meade lx 90 and when i am looking at objects that are almost straight up, the eyepiece is quit hard to get to between the fork mount, ect. Is there an extension or something that can be hooked up to it to extend the eyepiece out to see through it? Will this mess up the view of it at all(ratio)? Thanks, T. J.

SCTs usually have a lot of back focus available, so an eyepiece extension should work in this particular case as long as the extension is not excessively long. Another way to go for medium and high power is to use a Barlowed eyepiece combination to achieve the magnification you want.
--
Mike

If it's an 8" f/10, every inch of extending the focus will introduce ~1/16 wave of undercorrection, and increase the efective f# by ~5%. The final effect depends on what level and kind (overcorrected/undercorrected) of correction you have at the present focus position. If it is, for instance,
1/4 wave overcorrection, then a 2" focus extention would practically cut it in half. But if it is 1/4 wave undercorrection, you'd end up with 1/2.7 wave correction error.

For larger f/10 SCTs, the despace error diminishes proportionally (i.e. a 10" would have ~1/20 wave of undercorrection induced for every inch of focus extention).