In addition to Glatter's collimator, I also recommend Glatter's blug, if you are collimating a fast Newt. It greatly simplifies the laser collimation process for planar holographic alignment. http://www.greatredspot.com/collimator.htm The 2003 S&T article is good, but dated. Carlin and the collimator makers have moved on from what Carlin wrote there. Although I am tempermentally anti-gear, this is one of few times I recommend shelling out the bucks for the current high-end Glatter collimator and blug, if you own a fast Newt. Spending a couple of hundred on the collimator and blug is justified. It saves endless hours of headaches down the road and improves pointing accuracy for target acquistion. The cheaper laser collimators are not machined well-enough to accurately collimate a fast Newt. Design-wise, Glatter collimator designs also have a larger the battery segregated from the laser. Every time you change the battery on a low-end laser colliminator, the collimator tool itself goes out of the alignment. For Newts, the holographic or planar collimator changes the workflow focus (no pun intended) away from collimation adjustments at the primary mirror towards making most of the adjustments to the secondary with only a final fine-tune tweak on primary mirror knobs. - Kurt P.S. - If anyone knows an upgrade for a secondary mirror holder, please let me know. I'd like to get away from Allen wrenches and screwdrivers towards a secondary mirror holder that is rock solid and adjusts with some kind of locking knobs. There was an interesting advanced secondary mirror holder design in the April or May S&T. Blug review (not favorable) http://www.cloudynights.com/item.php?item_id=1480 ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ