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Re: Telescopic Limiting Magnitude calculator

Nils Olof Carlin — Sat, 04 Jul 2009 20:07:55 GMT

Don, thanks a lot for this - it helps to have something substantial to discuss. ... It would be nice to choose from standard valuer or calulate the recipe for

Re: Telescopic Limiting Magnitude calculator

pensack1 — Sat, 04 Jul 2009 16:06:20 GMT

Nils, Regarding the html code, here are some changes to make to adjust for your experience: 1) if (form1.Teletype[0].checked) { var DS=0.21*D; var

Re: Telescopic Limiting Magnitude calculator

Nils Olof Carlin — Sat, 04 Jul 2009 09:05:14 GMT

Don, ... You're right - I copied the wrong year from somewhere I can't recall now. ... While this is possible, I just don't think it's fair to the user to

Re: Telescopic Limiting Magnitude calculator

Nils Olof Carlin — Sat, 04 Jul 2009 09:00:19 GMT

... Seems many observers are not aware of this, but you will notice that after looking at a dark branch against the dark sky, moving your gaze shows there is a

Re: Telescopic Limiting Magnitude calculator

Robert Houdart — Sat, 04 Jul 2009 03:52:06 GMT

Don, ... In the new calculator you can enter your true pupil diameter instead of relying on the automatically calculated age-dependent value. Other changes

Re: Binocular Newtonian Telescope

John Mahony — Sat, 04 Jul 2009 02:51:53 GMT

Yes, although it's hardly big enough to qualify for this group: -John

New file uploaded to bigdob

Sat, 04 Jul 2009 02:06:57 GMT

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the bigdob group. File : /Collimation

Re: Telescopic Limiting Magnitude calculator

pensack1 — Sat, 04 Jul 2009 02:04:27 GMT

Robert, There is dark adaptation and there is dark adaptation. To wit: in the old days, serious observers doing threshold observations would often cover their

Re: Telescopic Limiting Magnitude calculator

pensack1 — Sat, 04 Jul 2009 01:54:19 GMT

Nils, Replies below. Don ... Wasn't that a 1989 article? ... Look at the html code behind this page: http://www.go.ednet.ns.ca/~larry/astro/maglimit.html In IE

Re: Binocular Newtonian Telescope

Christopher Todd — Sat, 04 Jul 2009 00:16:23 GMT

Not sure if anyone on this list has made one, but there's a whole Yahoo group devoted to that - binewt. Chris

Binocular Newtonian Telescope

pdebaan — Fri, 03 Jul 2009 22:55:45 GMT

Hi all, have a great 4th, Anyone made a Binocular 2 mirrorred Newtonian ? Peter

Re: Telescopic Limiting Magnitude calculator

Robert Houdart — Fri, 03 Jul 2009 10:15:10 GMT

Nils Olof, ... In the calculator the NELM deals with that, any value larger than 7.0 is interpreted by the Javascript as a perfect sky plus a sensitivity

Re: Telescopic Limiting Magnitude calculator

Nils Olof Carlin — Fri, 03 Jul 2009 07:40:33 GMT

looking again art Schaerfer's article (it must have been over 10 years since last time I perused it), I find these comments, that might be very relevant

Re: Telescopic Limiting Magnitude calculator

Event Horizon — Thu, 02 Jul 2009 23:20:14 GMT

It's interesting that the visual recovery of Halley was brought up. I too remember reading about that observation and just a few weeks ago I looked up the

Re: Telescopic Limiting Magnitude calculator

bob_hill12000 — Thu, 02 Jul 2009 14:07:27 GMT

Hi Robert, Steven's experience with his 20 matches mine with my 20. When going after some of the very dim targets that I do, I have seen that I can detect