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New 11" EdgeHD
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Robert Shartrand
开云体育Hi Keith, I use an Optec F5 reducer made for C14s using a ST8XME so there is almost no corner problems. My mounting rings for the guide scope are attached by a Losmandy D plate at both ends of the refractor just off the carbon fiber tube. It is rock solid. The insulation for the C14 is the same material used to keep the Sun off the dashboard of a vehicle. I put it around the OTA and the dew cap with bungee cords. No rocket science….just common sense. Bob ? ? Sent from for Windows 10 ? |
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" is it possible?... to get Sirius and the pup?" Haven't tried and can't really say.? The problem with that goal?is seeing and OTA light scatter. So a very clean OTA under good seeing ought to be able to do it(?)? AO would have no effect?on this venture?because the exp time necessary is a fraction of a second.? But "lucky imaging" (e.g. via?ZWO video) should be able to nail it. Actually, there hasn't been a really significant advance in amateur astro?CCD other than increased sensor size with marginally improved ABG QE. One notable improvement?for some CCD?is less read noise but?that usually?has small consequence for standard long-exp DS (though it can be useful for narrow band).? The old KAF chips?remain competitive and the SBIG ST-10 is still one of the?most sensitive affordable cameras (probably no longer available new).??Unfortunately CCD?has become?extinct in the mass market (Sony announced that they will no longer make CCD) and CCD has been relegated to the expensive scientific market.? Although CMOS has seemed promising for some time now they still perform poorly as hi-res (slow f-ratio) DS cameras due to low-flux instabilities. Stan |
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" LRGB image of M1 that has a FWHM value of 2.91 and the LUM sub exposures averaged 1.63" That doesn't make sense. LRGB takes all resolution from the Lum and only uses RGB to colorize that Lum.? So the FWHM of LRGB should be identical to the Lum alone. Anyway, 1.6" is very respectable. Few amateurs ever get below 2.0". Congratulations! Stan |
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Hi Keith,
Sorry I was thinking of the C14 price, the C11 EdgeHD is 4,450 GBP here (6,343 USD), still twice what someone would pay in USA (3399 USD). Yes 20 per cent VAT sales tax here does make it expensive but how come the price is DOUBLE here? I've never understood it. Yeah I use a lot of magnification on double stars, I like looking at Airy Discs at x700 ! Best Regards, Alistair G. |
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Interesting, and rough. Not only don't you have the greatest weather there either, but then it gets pricy too. I?found something out today that maybe is not commonly known? or?remembered. I got it touch with Celestron, and?there?are?30dys from date of purchase, where they will pay the shipping on a warrantee issue. I don't know if that policy extends beyond the US, Canada and Mexico? I think Meade used to have a qualified European warrantee center. But that may have been before their warrantee and repair departments went to pieces. There's only been 2 nights where I could do any testing. Fortunately I'd spent the cloudy nights before,?getting ready for the first night. The second night was half way into the 30dy period. But at least I was prepared to, and I did,?some diagnostic imaging. One other interesting thing... I was about ready to dive into and find out if any thing was loose in there. Take out the corrector and check it out.?Thankfully I did not. I would have voided the warrantee. Celestron is apparently VERY particular about the?corrector plate. Not only is it's rotational position?critical, a well known fact for most of us who have taken apart our scopes,?but those little set screws all around the perimeter precisely position the corrector as well. Celestron considers it fundamental to meeting or exceeding?their advertised?claims.?You touch 'em, and you're on your own. Celestron and I are going through the paces that they need to verify if I have a scope that won't stay collimated?when it moves about the sky. It is supposed to. Rigorously. Fortunately I took defocussed star images the second opportunity I had, from nearly horizontal?N & S,?to vertical. So I have those, and?they have asked for them. There's hope for a happy ending Keith From: "alistair.gutcher@... [C14_EdgeHD]" To: C14_EdgeHD@... Sent: Monday, March 28, 2016 3:12 PM Subject: [C14_EdgeHD] Re: New 11" EdgeHD
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Hi Keith,
Sorry I was thinking of the C14 price, the C11 EdgeHD is 4,450 GBP here (6,343 USD), still twice what someone would pay in USA (3399 USD). Yes 20 per cent VAT sales tax here does make it expensive but how come the price is DOUBLE here? I've never understood it. Yeah I use a lot of magnification on double stars, I like looking at Airy Discs at x700 ! Best Regards, Alistair G. |
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This is?an update to my original issue/post of a brand new C11 EdgeHD giving unacceptable star trails, with under 5min exposures, using a piggyback guide scope. As is to be expected, Celestron needed to be convinced that it is the scope that is the problem,?and not all the other reasons a piggyback tracking system?can cause a?similar appearing?outcome. Images of?defocussed stars going in and out of alignment as the OTA?went from?zenith?to near horizon?got their attn. but no RMA. They weren't large shifts, just unmistakable. Pointing out dust motes moving about the x/y location on the?image, as the scope moved about,?got no comment, although I thought it was much more convincing than defocused stars, And more measurable too.. Comparing a Meade image to a Celestron image, with the only difference being the OTA's, got nothing. Explaining that I've been imaging for well over a decade, I know what?I'm doing, and talking about, ...?with a web?site full?of evidence to show, got no comment What seemed to work, besides perhaps persistence, was the following Starting 10 arc min past zenith I took consecutive images over 1/2 hr with my guide scope piggybacked?on a high?quality refractor. ?I put the focuser and camera that I use on?the C11, on the refractor. I demonstrated under 5" deviation, RA & Dec, from the ideal track, for the entire 1/2 hr. I then repeated the above, substituting the C11 for the refractor, first?at f10, and then with their focal reducer at f7. It showed the same amount of?image shift at either FL. As a final touch, I tracked for an hour, demonstrating that?the image?shifted along the ?same arc as the OTA took, as it tipped and rotated from nearly vertical, westward along the RA track. That seems to have done it. I'm now waiting for the RMA process to play out.table?star trails,?at well |
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Gary Jarrette
开云体育It is number you get from the company that authorizes you to return something. You put it on the box and that starts the return process. Return Merchandise Authorization ? From: C14_EdgeHD@... [mailto:C14_EdgeHD@...]
Sent: Friday, April 15, 2016 7:45 AM To: C14_EdgeHD@... Subject: [C14_EdgeHD] Re: New 11" EdgeHD ? ? what's "RMA"? |