I have made a couple, using computer fibre optic cables, terminated 50 micron fibre.
One was a single light point, 1x F/O cable, 2x 1.5v batteries and an 2000mcd 5mm white LED, 3" of black electrical tape and 3"x6" jiffy box
The other 9 light points on a 1.2mx0.6m board.
The large one is great for adjusting coma correctors, field flatteners etc as you can take an image and look at FOV without moving the scope back and forth.
Hi,
can anyone post some links on how exactly you adjust collimation, coma correctors and what you should look for? I'm guessing you defocus and check if the secondary is centered? but is that about it?
At around $500 delivered, I'm not sure that's an experience I want. But if I ever win the lottery .....
You know you can collimate using a real star as long as seeing is reasonable? With practice, it can be done in ~5 minutes.
I first started with the Hubble Optics artificial star until I had practiced and knew what I was doing, and figured out how well collimation held, but don't use it that often anymore since I can do it "on the night" with equal ease.
The artificial star is useful for testing mechanical/optical alignment in the comfort of your own home - something that's more difficult to do in the field - and that's where I've used it most.
Hi,
can anyone post some links on how exactly you adjust collimation, coma correctors and what you should look for? I'm guessing you defocus and check if the secondary is centered? but is that about it?
Yes please, I did buy one of these hubble stars, but they have no instructions. I would like to use with my C11 EdgeHD if there are instructions for usage.
