Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Messages - contpeeresto

Pages: [1] 2 3 ... 8
Yes,I fullyunderstand.

I took electronics in college a long time ago and even so am not really up on power system safety. In your case, I'd fuse first and maybe add breakers later. Safety before convenience. For me, now I gotta get some fuses...

It's not a Pro. The Pro version doesn't have the DB9 serial connector on the RA electronics housing.

I could be wrong here, but it looks like it does have the DB9?
It's not a Pro. The Pro version doesn't have the DB9 serial connector on the RA electronics housing.

Beginners Forum / Re: A little newbie advice, please
« on: February 04, 2018, 12:41:22 PM »
OK so no magnification is 1X not 0X. Thanks.

If you look through a 7x35 binocular backwards, you are getting 1/7X, which is de-magnification.

General Astronomy & Observing / Re: Climate Change on other planets
« on: February 04, 2018, 11:03:48 AM »

No one denies climate change. The interesting part's also changing in all the other planets.
The main difference being, other planets do not have the carbon emissions that we humans are debating about. So what else is going on? Shouldn't we be looking into that?

Interesting comment! Can you reference that data? I would like read up on this.


You seem like a smart person. Can't you look it up yourself? Google is as close as your keyboard.[/quote]

I am not sure how smart I am, I get by I guess, and yes, I could Google the subject and get perhaps a million hits... but I was specifically interested in the data m1618 was pulling his comment from... I just felt like it would give me a more targeted approach, and to get a better feel for what drove his comment. Pure curiosity on my part...


I am perfectly aware of what you were attempting to do.

Beginners Forum / Re: Maksutov? Schmidt?
« on: February 02, 2018, 05:21:15 PM »
If you want an EQ5-type mount, and never have to look back...

Equipped with just the dual-motor drive with hand-controller and tripod, it's a great buy.

Mounts Questions & Expirience / Re: LX850 Starlock mount: Is it worth it?
« on: February 02, 2018, 04:45:25 PM »
Hi Andrew. I always enjoy your enthusiastic support of the LX850. It was certainly on my list when I was upgrading from the LX200. I think the major advantages even at that price point are the solid weight capacity and Starlock, if in fact it does work as advertised (ie: turnkey). I do think you need to be a bit more careful regarding your accuracy assessments. On the one hand you mention RA accuracy being +/- 1 arc-sec, and then refer to polar alignment as being within 1 arc-sec. I presume that you mean guide error / total RMS is less than 1 arc-sec, not native periodic error? And of course this would have nothing to do with polar alignment.


Light Pollution Topics / Re: Mostly Clear vs Clear
« on: February 02, 2018, 03:39:13 PM »
What you're talking about is transparency. Dust, smoke and humidity reduce the amount of light getting through from outside the atmosphere and reflect light pollution. In places with negligible light pollution, the sky is black on a good night. The only way you can tell that there are clouds overhead is that stars are missing. On bad nights, the sky is visibly gray.

Beginners Forum / Re: First ever upgrade, what telescope should I buy?
« on: February 02, 2018, 02:41:31 PM »
"How accurate does the polar alignment on a gem mount need to be if you are just observing?"

For visual observing, one doesn't even need Polaris in view. Set the latitude scale to your latitude, take a compass and aim the equatorial's RA axis to magnetic north, level the telescope with a small bubble level, and you're off. Only occasional, manual tweaking of the declination axis would be required, with a simple twist of its knob, and in order to keep any given object on track...

Motorise only the RA axis, and enjoy automatic hands-free tracking, which is particularly useful at the higher and highest of magnifications...

"I am hoping a used sct will show on Craigslist..."

The main draw of an 8" SCT is its relatively large aperture within a compact body. Keep in mind that with its 2032mm focal-length, it is an instrument for moderate-to-high magnifications. Its lowest practical power, with a 32mm ocular, is 64x, therefore instead of being able to scan the sky on the fly, you'll have to use an atlas to find what you want to look at. Conversely, a 32mm ocular combined with a 6" f/5 Newtonian: 23x, and binocular-like; for scanning the Milky Way in summer, and observing the galaxy in Andromeda and the Pleiades in winter. Synta usually bundles 40mm(51x) oculars with their Celestron 8" Schmidts, and in what I perceive to be an attempt to present the instrument as being somehow capable of wide-field, low-power views, when it's not in fact. In the end, it's essentially a celestial microscope; not as versatile as a refractor or Newtonian, and in observing the gamut; that is, wide-field deep-sky combined with respectable high-powered views of the Moon, the planets and single and double stars, and with the aid of a 2x to 3x barlow. Also, many refractors and Newtonians come equipped with 2" focussers, for 2" eyepieces and their wider views. SCTs do not; 1.25" only. Schmidt and Maksutov Cassegrains require dew shields for astronomical use, absolutely, yet they do not come equipped with such. The reason being is that they wouldn't look as enticing within the advertisements, and with their then-longer optical tubes...


Then there's its contrast-robbing secondary obstruction, and the largest of all telescopic designs...

This is not to say that you shouldn't consider one, but just be aware of the nature of the beast before deciding.

Light Pollution Topics / Re: Darkest Places on Earth
« on: January 31, 2018, 08:44:36 AM »
There are many black sky zones in the western U.S.--Oregon, Nevada, Idaho, Montana, Wyoming, Utah, a few in Arizona and New Mexico, and one in Texas. They are not always, or even usually, areas associated with great wealth. Dark skies.Jack

Beginners Forum / Re: help! help! help! (collimation)
« on: January 31, 2018, 05:38:55 AM »
Check the clips on the primary mirror. They should not be tight. Ideally, you should be able to slide a piece of paper between the clip and the mirror surface. Also make sure the scope has a chance to cool down.

Mounts Questions & Expirience / Re: Blue Astro Remote Control USB Hub
« on: January 30, 2018, 12:17:53 PM »
<p class="citation">QuoteIt's such a good product not to develop and take it to the next step.

There is a very good chance that the original design will make it as a product. Cant say any more.[/quote]

Looks like it was a reasonably-good product. I hope it eventually makes it to market.


... The value of the 56 mm Plossl in your F/10 SCT is that it makes dim objects like galaxies and nebulae brighter.


Obviously wrong. C'mon CN'ers.
It's not wrong. It's completely correct. And I say this with 25 years of experience as a visual observer. Now, the *visibility* of quite a lot of smaller galaxies and nebulae might be better at higher magnification, but that they are shown with greater brightness in a low power eyepiece is still true.Clear skies!
Thomas, Denmark[/quote]
A larger exit pupil does not makegalaxies and nebulae brighter. It might however make them appear brighter ...[/quote]
It actually does make them brighter on the retina of the eye, compared to an eyepiece of shorter focal length, by concentrating their light into a smaller image, which was what was discussed here, so in this context, it's true.Clear skies!
Thomas, Denmark

General Astronomy & Observing / Re: Dark Sphere near M81 and M82
« on: January 25, 2018, 09:38:40 PM »
If it doesn't have legs...I think you'll be O.K...

I had a "visitor" crawl into my camera one evening a couple of years ago.

Light Pollution Topics / Re: Where do you go?
« on: January 25, 2018, 05:19:16 PM »
Fox Valley looks very good. Another one, a bit to the northwest, is Heath Memorial. It's darker yet but not as well developed. From what I can tell, there aren't even privies.

Not quite as spectacular as Dan‘s Telescope: it‘s a 10“ f/11 Newtonian reflector.

Telescopes with long focal length offer beautiful views of the Moon and the planets and the pinpoint stars over the whole field of view are fascinating. Unfortunately, such telescopes are large and heavy. Mine currently doesn‘t fit onto my Tom Osypowski equatorial platform - a large drawback.

I‘m thinking about refiguring the Zerodur mirror to f/8 and rebuilding the telescope so it fits onto the platform. On the other hand, that‘s a lot of work...


Pages: [1] 2 3 ... 8