Collimating with a Howie Glatter

[lukebl]

Folks, I want to check the collimation on my Ritchey-Cretien, and was thinking of getting a Howie Glatter laser collimator as I've read that these are indispensable with RCs. 

All the guides I've read refer to an attachment for the collimator which creates concentric rings to aid collimation. However, I understand that this attachment has now been discontinued for some reason, although the attachment which makes a rectangular grid pattern is still available. How does this all work with a RC?

[MattJenko]

I actually found @kirkster501 's youtube tutorials on RC collimation really useful for my little RC6.

Youtube RC collimation

[lukebl]

23 minutes ago, MattJenko said:

I actually found @kirkster501 's youtube tutorials on RC collimation really useful for my little RC6.

Youtube RC collimation

Yes, I've seen those myself and they're very good. Unfortunately, though, he uses the very same concentric ring attachment which is now unavailable.

[Piero]

My 2 Glatter's laser collimators arrived with a 1mm aperture stop which reduces the laser beam and also makes concentric rings. It's a great tool.

For more details about collimation with a RC, I would ask @FLO.

[Piero]

The square attachment is for the secondary mirror alignment as shown in Jason D's posts on CN.

[Rob Sellent]

Howie Glatter collimator is a cracking bit of kit and I think in principal any of their attachments should work. Apart from FLO, you could also drop APM an email and see if they've got what you're looking for in stock.