Hi, I've recently bought an 8 inch GSO classical cassegrain telescope, and looking to buy collimation tools adequate for this telescope.
I first looked at some tools that many people use to collimate their RCs and CCs such as Tak collimation telescope, Hotech ACT and Howie laser collimator with holographic attachment.
Those "standard" tools seem extremely pricey, because I have to pay excessive shipping fee and customs duties, which almost totals up to about 50% of the initial price tag... for example, Hotech ACT cost about $750. uncool...
So I looked at more affordable options and came across a thread here claiming that the star collimation is all you need.
The final step of the collimation process is star testing anyway, so I thought an artificial star would fit my need.
During my research, I've noticed that the adequate distance between the artificial star and the telescope heavily depends on the size of the beam and smaller the artificial star, the shorter the distance can get.
So naturally, I was looking for an artificial star with very small beam size, due to the limited space I have around the city center where I live.
No gardens, no spacey parking lots, no park within reasonable distance. I also live in a 27 story apartment building where I could maybe get 7~8 m maximum of clear space somehow..
Then I came across this interesting piece of equipment, staggering 9 um beam artificial star from Pierro Astro.
Well I think it's not impossible to get a 9 um glass or plastic fiber, but I'm quite worried about the lack of user reviews or any information about it other than the descriptions on TS and the Pierro Astro websites.
If the item hold true to its specs, I could get my 8" CC and the star just 3 m apart!! (according to the table in Pierro-Astro.com)
Though it may as well be impossible to get the telescope in focus.
I'm very curious if anyone here have experiences using this and whether it's better than the common 50um artificial stars or not.
Thanks in advance.