Difference between 1.25" and 2" T adaptor

[xs2man]

Really basic this one.

I have a SW 130p-ds, and already have a 1.25" T Adaptor for my camera.  Would the actually be any advantage on keeping with the 2" size here?  I guess it is maybe a little more stable?  But other than that, would there be any advantage, or is it just a waste of money?

[Elm0]

I have both, but tend to use the 1.25 the most for viewing. 

The 2" I use to mount my DSLR and the 1.25 for eyepieces. 

[JR1987]

You'll find, like most others that sooner or later you'll want a coma corrector... Im new to astrophotography myself but I didn't waste any time and just ordered one with my scope. 

It works the same way a T-adaptor would, except you need a new T-Ring, M48. 

[Roy Challen]

Depending on how long the adapter tube is on the 1.25, you might find that you have less vignetting with the 2". That's what I found anyway.