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Posts Made By: Paul Kammueller

January 13, 2005 02:42 AM Forum: Beginning Astronomy?

Novice reseaching for first scope

Posted By Paul Kammueller

I would second what some others have said, 12" will blow your socks off but it's an awful big size and labor commitment for a novice starting out.

For a first scope, it's not a good idea to get something that's going to be a major production to set up, because it will often end up collecting dust. To start out an 8" f/6 is would be a much more convenient size, and you will be much less hesitant to just dash out the back door to set it up on a whim. That sort of 'instant gratification' is useful in keeping a beginner motivated.

I think you are on the right track to be focusing on the dobs, their sheer ease of use makes them instantly accessible to the novice. But 12" is a bit overkill to start with, unless you couple the purchase with a smaller companion, say a 4-6" 'quick look' scope.

January 13, 2005 02:28 PM Forum: Beginning Astronomy?

Stars?

Posted By Paul Kammueller

Not sure what you're expecting to see when you look at stars. If it looks like a "ball" to you, it sounds like you're looking at a "blur circle" of a star, how a star looks if you haven't focused (rack the focuser in & out until the image is as 'small' as you can make it by focusing -- get it tiny, point-like. That's how you know the star's in focus).

At low to medium power, stars should just look like, well, stars: little points of light (albeit much brighter in the scope). At VERY high magnifications (higher than you should be using) a star can appear as a 'ball' if you've magnified it so much you see the Airy disc (which is a property of the telescope's limit of resolution, not an indication of the star's actual shape).

January 13, 2005 03:19 PM Forum: Equipment Talk

4 Hole Aperture Masks - What's the theory?

Posted By Paul Kammueller

At f/4.8 the 4-hole mask will dramatically reduce the image-degrading effects of coma, since a MUCH smaller proportion of the light is coming from the mirror's edge.

In general it can also do much to mitigate the effects of a turned edge, undercorrection, or overcorrection (again by cutting down dramatically the proportion of light coming from mirror's edge) but I do not want to in any way imply that this is the case with Floyd's instrument.

January 14, 2005 04:09 PM Forum: Beginning Astronomy?

Eyepiece quality

Posted By Paul Kammueller

I second the vote for University Optics. The UO Konigs and Orthos are some of the sharpest eyepieces I've used and in the $50-$100 range offer a good balance of high quality and affordability. The konigs offer impressive fields (60-65 deg) with some sacrifice of edge sharpness. The orthos are razor-sharp but with narrower fields (45 deg). Orion Ultrascopics are an excellent combination of field (52 deg) and sharpness, contrast and price.

January 14, 2005 08:15 PM Forum: Equipment Talk

"First Light" on Huygens Probe!

Posted By Paul Kammueller

We've got rivers, folks!! grin

January 15, 2005 06:26 AM Forum: Off Topic Discussions

Astromart forum member passed away... :*(

Posted By Paul Kammueller

Mike - thank you for the message. This is a sad day for those of us who frequent the religion forum.

January 24, 2005 05:42 AM Forum: Religion

Anybody pick up on this?

Posted By Paul Kammueller

ROTFL. Middle-age crisis meets modern role-playing games. Somebody's been spending way too many hours playing 'Everquest'. grin

January 26, 2005 06:35 PM Forum: Politics

NASA cutting outer planets budget

Posted By Paul Kammueller

Maurice Clark said:
It appears that NASA funding is in deeper trouble than realised. First scrap the HST. Now this. All at a time when military spending is skyrocketing.
What we've spent on the current misadventure in Iraq would have bought about a dozen International Space Stations or about a hundred Hubble Space Telescopes.

January 27, 2005 02:07 PM Forum: Off Topic Discussions

Time Travel

Posted By Paul Kammueller

Besides that you need some incentive. I mean, let's face it, the past sucked. Who wants to go there? 8)

January 30, 2005 11:08 PM Forum: Equipment Talk

A real spider in my SCT tube

Posted By Paul Kammueller

For the hassle of removing the corrector and having to re-collimate, the risk of accidental damage to optical components in the process, and given the fact that this spider is not large enough to have any impact on performance (unless we're talking about a BIG spider) I'd probably leave it alone until I had to take the scope apart for some other reason, and remove it then.

In the meantime just avoid looking down the front of the tube -- out of sight, out of mind 8)