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Posts Made By: John Holt

July 9, 2009 05:41 PM Forum: Reflectors

Need info on old "Cave like" ota & mirror

Posted By John Holt
Perhaps ask here:
http://www.pegasusoptics.com/index.php?option=com_contact&view=contact&id=1&Itemid=30

July 27, 2009 12:19 AM Forum: ASTRONOMY

bifocals

Posted By John Holt
http://www.astromart.com/forums/viewpost.asp?forum_post_id=645414&poll_id=&news_id=&page=4

July 27, 2009 02:29 PM Forum: Eyepieces

Barlow Question - What am I?

Posted By John Holt
Jack Day said:

Picked this up at a atar party swap meet. I think it is a Siebert Optics 2.5X (2 inch) barlow, but am not sure if it is a standard or "telecentric" version. Any idea's or info on how they perform?

Thanks!


I suspect it is one of his telecentric because of the U, after a look at his web site.
http://www.siebertoptics.com/SiebertOptics-barlows.html

August 16, 2009 12:16 AM Forum: Eyepieces

Want opinions on lightweight, 2" wide field eypeic

Posted By John Holt
Daniel White said:

I have an 8" f/6 reflector, an antique Meade. I'm upgrading to a 2" focuser, and plan to buy a few
2" eyepieces. I don't wear glasses. I'd like to hear about eyepeices *other than*
Televue, Meade, Celestron, William Optics. Lightweight is a key issue, no way will I consider a 48oz monster. Right now I'm considering Orion Q70's, and I just heard about Baader Hyperions. Any other suggestions?


http://www.siebertoptics.com/



August 16, 2009 12:08 PM Forum: After Dark

Dark sites to go to without being harassed...

Posted By John Holt
Contact land owners in advance for blanket permission, written if need be. Not for time by time permission. But year by year. Like horseback riders do, hunters do and fishermen do. Permission (perhaps written) for you and only you.

Use public hunting land instead of parks. All year, except during (and immediately before and after) fire arm deer season.

If using private land, or road sides, then go later at night.
No, later still.

Bring no caffeine. Just rehydration whatnots. Be unwired, rather than wired when out under the night sky.

August 29, 2009 04:12 PM Forum: Equipment Talk

f/5 to f/7 80mm Ref for overseas??

Posted By John Holt
Perhaps the 4" Starblast ?
http://www.buytelescopes.com/product.aspx?p_id=6334&store_id=2&did=1

Celestron's little 3" newt comes to mind also, but it is really short in focal length so some magnification with it requires the added complexity of barlows and or additional shorter focal length ep's that are easy to look through.
http://www.optcorp.com/product.aspx?pid=12821&gclid=CK6OhpOoyZwCFQoMDQodezTCJQ

September 8, 2009 04:19 PM Forum: Equipment Talk

Secondary offset in Newtonians

Posted By John Holt
I think slightly flattened circular would be astigmatism in the optics. As in something too tightly mounted. Perhaps the secondary is pinched.

September 12, 2009 07:00 PM Forum: Solar System Observing

That Jupiter Show

Posted By John Holt
Jupiter has indeed been tremendous this time around.

September 26, 2009 08:04 AM Forum: Equipment Talk

Eyepiece Dew Control

Posted By John Holt
Well kinda sorta.
I found a cover on a rack did help with dew. And kept the ep's much cleaner then uncovered and racked.
Dew and wind blown dirt at my usual rural observing haunts was a very bad combo.
I evolved into cargo pockets for my solution. Only use a few ep's on any given night out.

October 4, 2009 07:16 PM Forum: Eyepieces

Parfocalizing 26mm Nagler with Radians?

Posted By John Holt
Parafocalizing ring on one or the other. And possibly an extension tube for one or the other, though I'd doubt that would be likely.

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