sct-user at Yahoo! Groups

Re: Vaccum grease

chuck kimball — Sat, 21 Nov 2009 05:20:41 GMT

might not be a good idea to accidentally aspirate any of this... lungs don't love such stuff... imho, don't put it on your nose.. chuck k ... [Non-text

Re: Vaccum grease

John — Sat, 21 Nov 2009 04:31:31 GMT

You both missed my point. There's no shortage of rip-off artists on ebay, and plenty of fake products with names closely resembling name brands. I was only

Re: Dimmer views of Moon/Jupiter between 6" f10 SCT compared to 6" f

John Mahony — Sat, 21 Nov 2009 04:29:56 GMT

That applies to prime focus imaging, but not to visual use. -John

Re: Vaccum grease

John Mahony — Sat, 21 Nov 2009 04:05:07 GMT

... No, no need for that. But yahoo does hide email address (everything after the "at" sign) if you read on the group site, so if you ever want to send someone

Re: Dimmer views of Moon/Jupiter between 6" f10 SCT compared to 6" f

NCarboni@... — Sat, 21 Nov 2009 01:52:36 GMT

I wonder whether it might just "look" brighter in one than the other because of differences in contrast... -Noel

Re: Dimmer views of Moon/Jupiter between 6" f10 SCT compared to 6" f

William Hamblen — Sat, 21 Nov 2009 00:03:15 GMT

... When you use a telescope visually the combination of objective and eyepiece has an infinite focal length because the rays of light exiting the eyepiece are

Re: Dimmer views of Moon/Jupiter between 6" f10 SCT compared to 6" f

Chris Peterson — Fri, 20 Nov 2009 23:54:46 GMT

... Assuming equal aperture area, and that the aperture isn't limited by the exit pupil. Chris ***************************************** Chris L Peterson

Re: Vaccum grease

jamelser69 — Fri, 20 Nov 2009 23:17:09 GMT

Hi All, Having, never used this product. Would this grease be appropriate for the threaded bolt on the focus knob or for any threaded item? Or would it be to

Re: Dimmer views of Moon/Jupiter between 6" f10 SCT compared to 6" f

Rod Mollise — Fri, 20 Nov 2009 22:42:26 GMT

Negative. 100x is 100x and the Moon, a planet _or anything else_ is just as bright at 100x in an f/4 telescope as it is at 100x in an f/10 telescope AND VICE

Re: Dimmer views of Moon/Jupiter between 6" f10 SCT compared to 6" f

BILL MAMMEN — Fri, 20 Nov 2009 19:14:01 GMT

John, don't match magnifications to make your comparison, match the F- ratios. Stars are point sources are not affected by the F-ratio. The moon and planets

Re: Dimmer views of Moon/Jupiter between 6" f10 SCT compared to 6"

Rod Mollise — Fri, 20 Nov 2009 19:09:59 GMT

Negative. The image will still be brighter at the same magnification. Peace, Rod Mollise Rod's new book: _Choosing and Using a New CAT_ Available Now!

Re: Dimmer views of Moon/Jupiter between 6" f10 SCT compared to 6"

Wally Lucas — Fri, 20 Nov 2009 18:33:10 GMT

The SCT has a much larger secondary, so this will make the overall image dimmer than that of your 6" F10 reflector...you are also a good observer to notice

Re: Dimmer views of Moon/Jupiter between 6" f10 SCT compared to 6" f

Doug — Fri, 20 Nov 2009 18:28:05 GMT

Your diagonal could be contributing to that too, as the Newt doesn't use one. Doug On Fri, Nov 20, 2009 at 10:12 AM, brightstarcomputers < ... -- Doug

Re: Vaccum grease

Jim Jewell II — Fri, 20 Nov 2009 17:51:20 GMT

Yep it seems no good deed goes unpunished in some form or manner, especially if your human. It is sad & tiring. Jim ________________________________ From:

Re: Vaccum grease

Chris Peterson — Fri, 20 Nov 2009 17:21:30 GMT

I don't know that outgassing is really the issue. The crap that comes in the scopes to begin with almost certainly outgases more than any silicone lubricant,