The 1.25" eyepiece holder (also known as a visual back) comes standard on the LX90 and the original LX200 telescopes. This adapter will allow you to use 1.25" eyepieces and accessories directly on the back of your SCT.
You mentioned the LX90 but I asked about a EXT90. I'm assuming that the visual back will work on my EXT90 and will be ordering it. Thanks!
AAARRRGGG!! I ordered it and received it very fast - but it is wrong, wrong, wrong. It is MUCH to large to couple with the back of the ETX 90. I guess I have to call...