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Posts Made By: Larry Seguin

January 14, 2008 09:29 PM Forum: Equipment Talk

UV/Skylight filters

Posted By Larry Seguin
Read about these filters, thought I might get one for my 17 Nagler, to protect that honking lump o' glass on the bottom. Question is: is it worth bothering? It doesn't sound like it would lose much light, but it seems to be simple optical glass, and I wonder about the effect on the image quality. Any thoughts?

February 7, 2008 02:20 PM Forum: LUNATICS

Any good websites?

Posted By Larry Seguin
Does any of the folk here know of a website for the moon that features some of the interesting things that can be seen that night?

February 7, 2008 09:53 PM Forum: Equipment Talk

Barlow Question

Posted By Larry Seguin
Does anyone remember seeing an Ultima barlow threaded for filters? I swear I used to have one of these. My current one is unthreaded, and the ones I see in the classifieds are all unthreaded. Anyone remember this critter?

February 18, 2008 04:44 PM Forum: Refractors

Is it an apo?

Posted By Larry Seguin
Re: the debate over what constitutes an apo....
I don't have a lot of experience with refractors (various 60 mm's, Astroview 90, C-102, ST-80, TV-102), but a thought occurred to me--
Since astronomical objects are varyingly listed by their visual magnitude and their photographic magnitude, couldn't apos be listed this way as well? A visual apo would be a scope that corrected for false color to a satisfactory level visually, and a photographic apo would correct so well as to show no false color photgraphically.
Just a thought.

July 15, 2008 02:25 PM Forum: Equipment Talk

Mirror refigure

Posted By Larry Seguin
I've got an 8" f/6 dob that I'm very fond of, and would like to have the optics refigured to get the best possible performance out of it. Not many of the websites I've visited seem to indicate pricing for an 8" refigure.
Question #1: Does anyone know of an optician who will work with this size scope?
Question #2: Who would you recommend, or allow to work on your optics?
Thanks for any help you can offer!

August 8, 2008 03:29 PM Forum: Eyepieces

8.5 Pentax XF

Posted By Larry Seguin
Thinking of trying one of these out...any of the folk here had experience with one of these? I picked up a 12 mm XF and liked it. Has some field curvature going on, but since I use that mag range for galaxies in a 14" dob, it hasn't been a problem for me. If the 8.5 works similarly, that wouldn't be a problem either. Thanks for any thoughts you may have to offer!
Larry

August 13, 2008 10:46 PM Forum: Equipment Talk

Suitable mount

Posted By Larry Seguin
I've been using an Orion ST-80 with a Bogen 410 head on the Paragon HD mount, and been very happy with the performance of this set-up. I just acquired one of Celestron's 80 ED scopes, and I think I'm overloading this mount. Does any one have a suggestion for an alt-az mount for this scope that would be: 1) lightweight, and 2) relatively inexpensive? The general idea is an inexpensive grab'n'go set-up. I'd kind of like to keep the Bogen 410 in this system, if it helps to know that. Thanks for any help you can offer!
Larry

August 25, 2008 10:11 PM Forum: Equipment Talk

cleaning refractor objective

Posted By Larry Seguin
Well I've finally got to give in and do it. Got a small refractor that has spots on the lens. Some of it may be pollen from trees and flowers nearby. Any tips on how to gently clean a refractor objective? Thanks for any thoughts you can share!

September 6, 2008 05:19 PM Forum: Eyepieces

For Mike Hosea

Posted By Larry Seguin
Mike, I went ahead and ordered the Pentax XF 8.5 mm I was researching. Thought you'd be interested...the literature included no longer mentions unblackened lens edges in any of the groups. I tried it last night on the Moon, Jupiter, and several bright stars, and the effect you had mentioned did not occur. Looked at these objects on axis, off axis, and allowing them to drift into the field of view. Also tried various eye postiions to see if I could reproduce the glare you had made note of. All in all, I found the version I received to be very satisfactory, and a nice performer on a small, lightweight, short focus apo refractor. Thanks for pointing out what to watch for.
Larry

September 11, 2008 03:13 PM Forum: Eyepieces

New Zeiss Abbe Orthos

Posted By Larry Seguin
Anyone see the announcement in Astronomy Technology Today about the new Baader/Zeiss run of these ep's? Prices look interesting, too!

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