I'll give the second question a comment...don't feel sufficiently knowledgable to tackle the first.
I'd highly recommend the non-laser collimating eyepiece as a first collimation tool...
I find that it is simple to use, requires no batteries, and never needs realignment.
While there are good laser collimators available (I'm sure), the standard Orion non-laser collimator is solidly built and will last a lifetime...it is good at aligning the secondary and primary and is a "must have" tool for newtonian reflector owners.
I do own a laser and do use it (and they can be helpful tools) but I always count on the Orion Collimating Eyepiece and use it as "the standard"...even when I use the laser to "fine tune" I always go back to "double check" it with the old fashioned non-laser tool.
|