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Jupiter February 7, 2015 From DEC

 

Seeing was stable enough. One Shot Color.


Dan L
Re: January 29, 2015

 

Excellent!


Did you image the resent triple transit of Jovian moons??

Or know of any good shots?


Stan
January 29, 2015

 

I finally had good conditions last night when this 18 minute image was taken:


?Brian
Re: Digest Number 3497

 

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Very nice Lynn, some excellent images there. Good work capturing the supernovae.?

-Charlie

On Jan 11, 2015, at 3:15 AM, C14_EdgeHD@... wrote:

Celestron 11" Edge reducer on 14" Edge?

Sat Jan?10,?2015 4:46?am (PST) . Posted by:

lynnvr2000

Hi all,?


I've been very quiet so far since this group seems mostly focussed on planetary astrophotography instead of deep sky, but if anyone is interested, a few of my images with my 11" Edge are here: 2011 - 2014 Astrophotography?although some are also with my Nexstar 11" (all in the family).?



2011 - 2014 Astrophotography??Lynn van Rooijen's 2011 - 2014 Astrophotography set?



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Re: Celestron 11" Edge reducer on 14" Edge?

[email protected]
 

Thanks Stan & Ed,

That is my feeling too: it won't be ideal, but maybe not much worse than a normal, non-Edge 14" . Well, for getting some central stars in focus for a drift alignment, it doesn't matter anyway, I guess, but I was silently hoping to catch the comet too. However, despite the clear skies this evening, we are on the end of a storm with gusts to 100km/h so the atmosphere is churning and won't be great anyway. I will report back...

Lynn
Re: Celestron 11" Edge reducer on 14" Edge?

[email protected]
 

If you look at the EdgeHD white paper, you will see that the position of the corrective optics in each of the four scope sizes is different.? As a result, I would be surprised if the C11HD reducer worked properly with the C14HD.? It might work to some effect, but it's hard to say how good or bad it would be with the significantly different optical spacing that results.


Ed Thomas

Deep Space Products

www.deepspaceproducts.com
Re: Celestron 11" Edge reducer on 14" Edge?

 

"any idea if the 11" (Edge) reducer would work on the 14" (edge) as a temporary solution? "


It is certainly worth a try. You might need to adjust the back distance a little.


Reducer/correctors are not aware of aperture but are?sensitive to f-ratio and FP curvature.? Generally a lens that works for a faster optic will work?well on a slower optic. But there may be a small difference in FP curvature, so it might not be perfect but I would expect it?to be pretty close.


Stan
Celestron 11" Edge reducer on 14" Edge?

[email protected]
 

Hi all,


I've been very quiet so far since this group seems mostly focussed on planetary astrophotography instead of deep sky, but if anyone is interested, a few of my images with my 11" Edge are here: although some are also with my Nexstar 11" (all in the family).


Anyway, a bit of a strange question perhaps but I have a Celestron reducer for my personal 11" Edge and we are setting up a public observatory with a 14" Edge (and 16" Meade). I wanted to set up the scope tonight and try it out - but as yet we don't have a reducer for the 14".

So my question is: does anyone have any idea if the 11" reducer would work on the 14" as a temporary solution? They both talk about the same reduction compression and the same back focus - identical specs in fact - and as far as I can see, the telescope backs have the same threads. In the images at the Celestron site, they look suspiciously similar and they are the same price.

I have other reducers that work equally well on various aperture telescopes but the 11" reducer does say specifically 11" on the side so perhaps the optics inside are different?

I'm not looking to do any super astrophotography tonight, just get to focus, do some drift alignment and take some quick shots of the comet (making f/11 less desirable due to FOV) - so some coma at the edges is less important if a difference in the 11"/14" messes that up a bit.

Thanks!
Lynn
Re: Jupiter December 27, 2014 GRS from DEC Large

 

"surprising how much oversampling you really need"


The Nyquist criterion for sampling a Gaussian PSF is FWHM = 3.3 pixels. So?"3.3 times oversampling" may actually be proper sampling for the best frames.


The PSF?of very short exps?is not Gaussian?but rather a?variably convolved Airy disk/ring function, for which?the Nyquist criterion for?Gaussian PSF is not fully adequate.? Additionally, stacking introduces alignment issues that potentially degrade?sampling and thus benefit from "oversampling".


Stan
Re: Jupiter December 27, 2014 GRS from DEC Large

 

That's really nice. It's surprising how much oversampling you really need. I usually go for an image scale that is about 3.3 times oversampling vs the diffraction limit of the scope (ie the Dawes or Raleigh limit).

?

Drew S.
Re: Jupiter December 27, 2014 GRS from DEC Large

 

Thanks. I was surprised imaging over 10 meter focal length paid some good dividends.?

Dan Llewellyn
Re: Jupiter December 27, 2014 GRS from DEC Large

 

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Really nice image !

Christian

Le 03/01/2015 06:07, maadscientist@... [C14_EdgeHD] a écrit?:

I over sampled more than I usually do. It paid some unexpected dividends. C14, Zeiss 2.6x Barlow, Blackfly GiG E w/sony 104 cmos, one shot color.

?

Dan Llewellyn
Jupiter December 27, 2014 GRS from DEC Large

 

I over sampled more than I usually do. It paid some unexpected dividends. C14, Zeiss 2.6x Barlow, Blackfly GiG E w/sony 104 cmos, one shot color.

?

Dan Llewellyn
Re: Celestron c 14 orange

 

Hello Jose. If you are asking what the numbers mean on the back of the primary mirror in a C14 (or any other Celestron SCT), they are the "serial number" for the optics set. There should be a matching number on the back of your secondary mirror. There should also be a matching number very close to the edge of your corrector plate (at the 3 O'clock position looking from the front of the 'scope) that will be hidden behind the corrector retaining ring. For example my C11 has the 4 digit number "3678" optics set etched into the corrector plate edge. Maybe that means it was the 3,678th 11" optics set made by Celestron. I haven't had a chance to check the back of the secondary or primary mirror yet.

Regards,

Alistair G.
Celestron c 14 orange

 

hello buenis days, my name is joseph and I am new to the group, please .I have to belong to the group with a Celestron 14 orange and very happy, I wanted to ask a question what means the number behind the primary mirror and matches the lamina Smith ?, sorry for my bad inglés.saludos.Jose.
Re: Jupiter December 2, 2014 GRS, C11 Edge from DEC

 

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Well done !!

Le 08/12/2014 22:44, maadscientist@... [C14_EdgeHD] a écrit?:

Seeing Stable. Last of the images from the C11 Edge HD, it got sold.


Dan L
Re: Jupiter December 2, 2014 GRS, C11 Edge from DEC

 

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It can’t be hard to sell with results like than Dan!

-Charlie L.

1

Jupiter December 2, 2014 GRS, C11 Edge from DEC

Mon Dec?8,?2014 2:44?pm (PST) . Posted by:

maaadscientist

Seeing Stable. Last of the images from the C11 Edge HD, it got sold.?



Dan L?


Jupiter December 2, 2014 GRS from DEC Final (Maadscientist) | AstroBin??



?

Jupiter December 2, 2014 GRS from DEC Final (Maad...??AstroBin is an image hosting website specifically targeted to astrophotographers: it's the first and the last place where you need to upload yo...?
Jupiter December 2, 2014 GRS, C11 Edge from DEC

 

Seeing Stable. Last of the images from the C11 Edge HD, it got sold.


Dan L
Re: December 2, 2014

 

Wow! (again)

The seeing may be the best thing?about Georgia...


Stan
December 2, 2014

 

I finally had a decent night of seeing for the first time in week



Brian
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