What to know more about CatEye Collimation

[flyingbaby]

Hey everyone,

I would like to know which one to buy in order to collimate my 10" GSO Newtonian properly?? (http://www.catseyecollimation.com/http://www.catseyecollimation.com/)

Also I would like to know, as I push the primary mirror about 3.5cm closer to the secondary.... (So that my DLSR can get into focus) do i need to increase the size of the secondary mirror??

Hope to hear from anyone....

Thanks in advanced

[ZeroID]

Hey Allan, get NEWT software to work out your secondary mirror size. Can't see it listed in the links or software pages but a quick search will find it. I shortened mine for the DSLR but the mirror was oversize in the first place so no problem.

[erick]

Hi Allan, I gather your miror is an f5?

Then, if you want the full suite of tools you would get:-

Sight tube:-Teletube XL
Cheshire:- Blackcat XL
Autocollimator:- Infinity XLK

You also should get the kit to centre spot your primary mirror with a yellow "hotspot" - it includes the spotting template and the spot. If you decide not to get an Autocollimator, then you could get the triangle spot rather than the "hotspot".

Now, many say that you could stop at the Cheshire, that the Autocollimator would add a level of precision that is insignificant at f5. But if you can afford it and have the time to spend at the scope (a few more minutes at most) and like to have what you feel is the best you can achieve, you can get the Autocollimator as well.

If you want to save money, and space in your kit, ask Jim Fly to advise. There is a model of the sight tube that includes a reflective ring so it can act as a Cheshire as well. I haven't used it. Also there are various packages of tools and spotting templates - ask Jim which is the best mix for your needs.

ps. get one of his red clip-on LED illuminator lights as well.

[astronut]

Couldn't agree more Eric!!! Catseye all the way!!;);)

[Moon]

Why not just get:
Autocollimator:- Infinity XLK
Sight tube + Cheshire: TELECAT XLS

The hotspots and template are good too.
I find that website a bit confusing at times.
James