Originally posted by v5planet Miguel, I've seen some products that say they can be used for both eyepiece projection and for prime focus, but say they should not be used with Schmidt-Cassegrains. Do you have any experience with these? These adapters are all cheap enough that I don't mind spending on both of them individually, but it would be convenient if they were two-in-one.
There is no reason, why a simple combination of a T2-adaptor with an eyepiece projection adapter wouldn't work with a SCT. We've use that combo for decades in our astronomy club. The only problem is, that the smaller SCTs, and I assume your LX90 is the 8'' version, have a narrow diameter at the backplate an you'll get some vignetting. I In the past I use the TeleVue eyepiece projecton adaptor, because it is very solid and stiff. But have switched to the Baader T2-system a couple of years ago, because it is much more versatile.
For mounting the camera piggyback on the scope, you could use the Meade piggyback adaptor. But I find it quite useless, as the camera is only fixed by the tripod screw and tends to rotate. It is better to add one of those dovetail mounts (again Baader Planetarium), which serve as a base for finder scopes or alternative instruments. I use the Witty 1 mount on the Baader Standard Basis:
Sucherhalterungen und Zubehr, Tangentialanstze bei Baader Planetarium - Zubehoer, Sektion 13
You get an impression on their website, but these pages are currently in German only. If you need help, I'll provide the translation for you.
Ben