I'm happy to share my experience of the Hotech laser I bought. Unfortunately that experience has been limited for a lot of reasons which have meant I have had little observing time over several months. David was very helpful, responding prompting to the few email queries I had.
I haven't got to my "better V-block" which has turned into the concept of using my spare GSO Crayford focusser as a suitable jig to test the laser's internal collimation, however I have used it 3-4 times, as supplied, collimating my 12". Haven't barlowed it as yet - just used it directly. A little more effort to mount snugly in the focusser, compared to just plonking my previous GSO laser in and tightening the screw, but I'm happy I am getting it mounted correctly now - the videos on the Hotech site are very useful for this. Then it was easy to adjust secondary and primary for centring and accurate laser return. Then I immediately dropped in my farvourite Cheshire collimating eyepiece and it showed the collimation to be as good as I would want it to be. So I'm very happy with the Hotech collimator.
I will still look to test the collimator on the bench with the spare focusser and also need a good and quiet night to carefully check the results against a couple of cheshires and then star test.
And, no, I haven't tried it on my C8. I probably won't.
Eric
