telrad riser plates?

[rory]

do i need one ? are they just for comfort or what ? im getting a telrad for a 90mm refractor, and no idea what the riser plates do ?

[Skylook123]

The riser plates lift the Telrad higher off the surface than the standard base. I had to use on a previous truss dob, where the secondary cage upper and lower circles would not let the Telrad settle down onto the base; it needed the riser to get the three adjustment knobs accessible.

[ajg]

They're for comfort. They just clip into the base that comes with the Telrad, so if you're not comfortable, you can add the riser later.

I have the 4" one on my 12" dob and it's great.

[JamesM]

I don't use a Telrad riser on my refractors as the scope's tube is long enough to fully secure the long base. Also by not using them, I don't have the problem of the riser catching on anything when I pack the kit away (I don't like the idea of drilling any tube and use double sided carpet tape to attach the base which is plenty).

James

James

[rory]

okay,so theres no real reason for me to get a riser then ? and i can position it anywhere along the main tube ?

thanks all