[pmrid (Peter)]

I've now had an opportunity to use a Howie Glatter 2" laser with circle hologram, a Takahashi Collimating scope and, thanks to a very generous Brisbane member, a Hotech Advanced Laser Collimator.

Before starting I had installed a focuser tilt plate and taken quite a while to get the Feathertouch pointing precisely at the secondary centre-spot (on the assumption that GSO placed the spot properly).

I then used the Tak scope to get the secondary lined up with the focuser. I didn't do the primary at that stage.

I then put the Howie Glatter laser in the focuser and projected the hologram onto the Hotech screen. As you'll see from the photo, it was bang on. On that basis, I made only minor adjustments to the primary.

Then, with the Hotech screen in the same position (since I had already spent an hour or so getting it into the right spot), I urned the Hotech on - with the centering cross-hairs and the 3 lasers. As you'll see from the image attached, the thing seemed pretty darned close to being centered but the 3 dots were far from in agreement either with each other or the Tak or the Hotech.

There seems to be gebneral agreement between Tak and Glatter and appreciable difference between them and the Hotech.

If the weather breaks, I'll do some star testing to see whether they agree with the Tak/Glatter camp or the Hotech, or none of the above.

Peter