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Dave, thanks for posting your modification to the BLUG (again, the photos are much appreciated). I've got a couple of questions:

1. How did you cut the Kydex ring?

2. How is the Kydex ring secured to the BLUG? Is there a lip that it is resting against?

3. In your opinion, how does the BLUG + laser collimator differ from the Kendrick 2" laser collimator with the beveled face? I understand that the BLUG contains a barlow so that the spot is a larger diameter. The diameter doesn't seem to be an issue with the Kendrick due to its engraved pattern on the beveled surface.
Does the difference have more to do with the fact that the BLUG isn't physically attached to the collimator, instead being aligned with the focuser?

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i cut the inner hole with a 2" spanner bit, then w/o moving the press or the piece, i made the outer cut with a 2.5" hole saw. i stopped just short of a full cut, and "punched" it out of the sheet. if you cut all the way through, you will distroy it or it will fly in your face; because there is no way to hold it down.

the ring is exactly the same size as the BLUG so it slides down snug. it wont fall off because of the o-ring.

the barlowed laser is better because it ignores focuser slop; you can shake the focuser and the shadow does not move. the shadow is more accurate to center than is the beam going back down the hole too.

google nils olofs article and see why its so much better.

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dave bonandrini
30" f/5.2 Dobsonian
President of GCAC
Astromart Moderator

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