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Hi Charles
For us looneys who use their telescopes for taking images with an equatorial mount when we first setup, we need to do a first star alignment.
So we would command the mount to goto an alignment star and if it doesn't appear in the FOV of the camera, we use the Telrad to get that star into the inner circle by using the mounts RA/DEC controls. When the star is in the inner circle of the Telrad it will also apppear in the FOV of the camera, which we can then fine tune to centre the star in the frame and press the Enter key for the mount so it now knows where it is pointing..
That's about it, once the mount knows where it is pointing we don't really need the Telrad anymore.
These days with Plate solving software the Telrad is redundant, just point the mount to a random piece of sky, take a 10sec image, plate solve that image which returns the centre RA/DEC address and sync the mount to that address.
P.S. I don't remember seeing blood vessels when viewing but I did have a lot of floaters which is annoying.
Cheers
Bill
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