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Brooklyn
scholastic sledgehammer
Reged: 07/24/08
Posts: 870
Loc: Central New Jersey
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Re: Collimation tools VS Star method...
08/16/08 01:45 AM
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"I recently looked through an acquaintance's Celestron 8 SE, which had been collimated only on Polaris at 200x, and I found the images of Jupiter to be very sharp indeed. I was very impressed."
Hmmm....but polaris is so high in the sky...wouldn't the collimation of lower degree objects be completely off?
Most people i have talked to suggest that I use ALTAIR, DENEB, or VEGA as collimation stars.
They form a very noticable triangle, although they're not in the same constellations.
Altair is around 45 degrees all night long, while deneb and vega alternate on who is higher and lower around 50-70 deg.
Lets not forget, for most people in the northern hemisphere, ALTAIR VEGA and DENEB are the 3 brightest stars in the night sky. For me in new jersey, the only other stars that are close to these in magnitude are maybe Arcturus and the other bright red giant, whose name escapes me right now.
I think the collimation star should depend on what degree range you are going to observe.
For me, I do all of my observing over 20 degrees in all directions. To the north and east I have a large forest of trees blocking my view all the way up to 40-60 degrees high!
So, for the most part I end up using Vega since its ridiculously bright...which is just what you need to get that near perfect collimation. The brighter the star is, the more noticeable it's diffraction rings will be.
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Meade 8.25"(209.55mm) LX-90 EMC (SCT)
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