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Posts Made By: David Goldman

July 1, 2014 04:53 PM Forum: Eyepieces

Pentax XL vs XW

Posted By David Goldman

I have several XL's eyepieces and I'm quite happy with their performance.
However, I've never looked thru an XW.
Aside from the slightly wider FOV in the XW, is there a any real difference in performance?.

April 25, 2015 11:32 AM Forum: Telescope Making

Mirror coatings

Posted By David Goldman

I'm shopping around for a company that has the best aluminum coatings. Any suggestions?.

June 23, 2015 05:01 PM Forum: Refractors

SEMI-APO ?

Posted By David Goldman

Does semi-apo mean the same as semi-pregnant?

January 7, 2016 03:02 PM Forum: ASTRONOMY

Why do i see green ?

Posted By David Goldman

Got a free pair of sunglasses that have lenses with a purple tint. When I take them off, everything turns green. Why?

April 6, 2016 06:46 AM Forum: AstroMart FAQ

Astromart ad

Posted By David Goldman

Why was my astromart ad deleted Herb?

February 24, 2014 06:49 PM Forum: Audio

Re: Poor quality CD's from original vinyl recordin

Posted By David Goldman

Thanx for the enlightenment Rex.

June 12, 2014 07:14 AM Forum: CCD Imaging and Processing/Solar System

Moon with a Questar 3.5

Posted By David Goldman

Really great job!.

June 16, 2014 03:54 PM Forum: Bad to the Bone Autos

Running on wind

Posted By David Goldman

Why not put a wind turbine on top of the Volt?. Then you can run it for free!.

June 25, 2014 08:27 AM Forum: Refractors

Vintage 90mm f=1000mm Orion Skyview achromat OTA

Posted By David Goldman

It is my guess the triangular patterns were created in the fabricating process or the glass itself is defective.

June 25, 2014 11:35 PM Forum: CCD Imaging and Processing/Solar System

Mars

Posted By David Goldman

Magnifico Lorando.