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What's the difference btw old C11 & the new EDGEHD 11 OTA?

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13 replies to this topic

#1 sink45ny

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Posted 30 December 2017 - 03:02 PM

I have an old orange tube C11 deforked. I hear people talking about locking the mirror and the newer EDGEHD 11 might have a different means of focusing. Can you please bring me up to date with the new technology.

 

I appreciate your help!!


Edited by sink45ny, 30 December 2017 - 03:55 PM.


#2 Jim Waters

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Posted 30 December 2017 - 04:38 PM

The new EDGE HD uses new optics in the Draw-Tube and possible a new focuser mechanism. IMHO your old C11 can't be upgraded.



#3 The Planetman

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Posted 30 December 2017 - 04:49 PM

The only upgrade to the orange tube and pre-EDGE C-11's is a Feathertouch or Moonlite type focuser.  You can not lock the mirror on the older ones.  I have a CG-11/Ultima type OTA and there is no provision for locking the mirror.


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#4 sink45ny

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Posted 30 December 2017 - 05:05 PM

I am considering purchasing a new EDGEHD 11 OTA, but know little about it.



#5 The Planetman

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Posted 30 December 2017 - 06:08 PM

If I remember correctly, the EDGE is now made in China.
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#6 DismalScientist

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Posted 30 December 2017 - 06:15 PM

Here is Celestron's document all about the Edge system. 

 

https://s3.amazonaws...paper_final.pdf

 

I have a C14 HD and love it.


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#7 DismalScientist

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Posted 30 December 2017 - 06:17 PM

If I remember correctly, the EDGE is now made in China.

This is my understanding as well, except for the 14" which is still made in the USA. I think they all still go through testing in the US before being shipped out.


Edited by DismalScientist, 30 December 2017 - 06:18 PM.


#8 MHamburg

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Posted 31 December 2017 - 11:32 AM

I have the Edge HD 11 and love its performance. FWIW I recently added a couple of 3 lb. weights to the counterweight shaft instead of the hanging improv, rebalanced, and now the tracking is better than ever even with all that gear on the CGEM.

 

Michael

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Edited by MHamburg, 31 December 2017 - 11:35 AM.

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#9 Eddgie

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Posted 31 December 2017 - 01:13 PM

The EdgeHD scopes use a sub aperture corrector placed inside the baffle to eliminate coma and flatten the field. 

 

This means that when imaging with modery large CCD chips, the field will be very sharp all the way across, Vs the blurred stars that would show up in the standard C11 at the edges of the field. 

 

On axis, they will perform the same, but off axis, the EdgeHD is a far better performer. Some say that it only matters for imaging, but my experience was that when using visually with modern ultra-wide field eyepieces, the edges of the field would be comatic and out of focus with the standard SCT, and razor sharp using the same eyepiece in the EdgeHD.

 

Now people will say that it is not worth the cost, but that is an individual judgment call.  If you use refractors and love the wide, coma free fields, then you might place far more value on the EdgeHD design..  I know I did.  My EdgeHD 8" as the most satisfying SCT (pinpoint across the field) that I have ever owned.   Equal in off axis sharpness to refractors.


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#10 sink45ny

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Posted 31 December 2017 - 01:21 PM

Eddgie I am thinking of getting the 11 inch or 14 inch Edge, but also looking at the planewave 14 inch.



#11 Daniel Mounsey

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Posted 31 December 2017 - 01:54 PM

Sounds like you're trying to image. I've already compared the two designs on numerous occasions but did a more extensive comparison for visual observers just recently. 

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#12 Daniel Mounsey

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Posted 31 December 2017 - 01:59 PM

Dew from my observing location is usually indicative of good seeing and eventually ended my comparison later into the night but I was able draw some of my own conclusions prior. 


Edited by Daniel Mounsey, 31 December 2017 - 02:00 PM.


#13 Umasscrew39

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Posted 31 December 2017 - 02:32 PM

I agree with Eddgie about the edgeHD optics.  My C11" EdgeHD is an excellent scope.  I have used it both visually and for short exposure EAA images.  It produces very sharp views in both cases and is very versatile in that it can provide great images at f/10 (prime), f/5, and f/2 (with hyperstar).  Of course, the advantage of the edge optics is removed when you replace the secondary mirror by the hyperstar.  The sharpness is comparable to my refractor.  I have not tried a C14" but some owners of both have stated that the C11" EdgeHD hits the sweet spot when considering all aspects: e.g., cost, weight, and performance. 


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#14 akulapanam

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Posted 01 January 2018 - 10:21 PM

Eddgie I am thinking of getting the 11 inch or 14 inch Edge, but also looking at the planewave 14 inch.

If your going to image and you have the money I would go with a Planewave because the primary mirror is fixed and it is quite a bit faster than a C14.  However, understand to really make use of that system your going to want at least a 16200, about $10k for a mount that can track well with it, and good enough seeing to actually make use of the resolution.  I think a C11 Edge HD can make an excellent imaging system as well if you have the reducer and upgrade the focuser.  The big benefits of a Edge scope are a well corrected/flat field up to 42mm and mirror locks.

 

If your looking for visual I would go with a C11/C14 because you will have higher contrast, although if you have the money, there are some better high end options for the $15k that Planewave will charge.


Edited by akulapanam, 01 January 2018 - 10:22 PM.

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