Q1: Does it work for using 1.25" eyepieces in a DS 2130 reflective telescope?

A: It will work with anything that accepts 1.25" eyepieces.

Q2: Is this the thing needed to attach the 0,63 focal reducer together with a DSI camera or some other 1,25" eyepiece?

A: Actually you will not need this unless your schmidt cassegrain scope is only set-up for 2" eyepieces. The Focal reducer threads to the visual back of your scope and you can just put your eyepece into the focal reducer.

Q3: I have been loaned a 15 year old Meade 8" SCT. It is missing the eyepiece adapter that screws onto the back. My old Criteriaon Dynamax eyepiece adapter does not fit (it is too small.) Will this item fit an old Meade, s/n 8029xx? (The scope is also missing its mount, though I assume it will fit on a standard wedge.)

A: it should fit though it is hard to say, you may need a 2". Meade will be better able to answer questions regarding the older versions of the scopes that are no longer avaialble. you can reach them at 800-626-32333