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Equipment Discussions >> Cats & Casses

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Footbag
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CES is today... Celestron Edge HD FR?
      #5612286 - 01/08/13 04:42 PM

CES began today. The rumor was that the FR for the Edge HD 800 would be introduced at CES. Anyone hear anything?

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AstroGabe
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Reged: 01/10/10

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Re: CES is today... Celestron Edge HD FR? new [Re: Footbag]
      #5612399 - 01/08/13 05:53 PM

Check out the vendor forum.

http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/5612204/Main...

Looks like $300, which is a welcome sight considering the more expensive 11" and 14" models. I'm still waiting for the 9.25HD reducer. Maybe next year?

Gabe


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Footbag
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Re: CES is today... Celestron Edge HD FR? new [Re: AstroGabe]
      #5612424 - 01/08/13 06:09 PM

Awesome! Thanks.

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Pinbout
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Re: CES is today... Celestron Edge HD FR? new [Re: Footbag]
      #5613679 - 01/09/13 12:50 PM Attachment (47 downloads)

here's their booth...

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Footbag
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Re: CES is today... Celestron Edge HD FR? new [Re: Pinbout]
      #5613786 - 01/09/13 02:06 PM

Thanks again!

Edited by Footbag (01/09/13 06:43 PM)


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Peter in Reno
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Re: CES is today... Celestron Edge HD FR? new [Re: Footbag]
      #5615193 - 01/10/13 10:27 AM

This FR is now at Celestron web site but no photos yet.

http://www.celestron.com/astronomy/edgehd-7x-reducer-lens-8-inch.html

It says 105mm back focus. I am not happy about this much shorter back focus than 133mm for F/10.

Peter


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Patrick
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Re: CES is today... Celestron Edge HD FR? new [Re: Peter in Reno]
      #5615732 - 01/10/13 03:27 PM

Peter,

Yes, but it's a "generous" 105mm back focus!

How much back focus are you currently running on your imaging train?

Patrick


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Peter in Reno
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Re: CES is today... Celestron Edge HD FR? new [Re: Patrick]
      #5615751 - 01/10/13 03:42 PM

Celestron C-8 EdgeHD at F/10 requires 133mm back focus due to built-in flattener inside the baffle tube. That's what I am using.

Celestron should know better that 105mm is too short for many imaging equipment. What about Adaptive Optics, rotator, etc? 105mm will not work with these equipment.

FR for C-11 and C-14 EdgeHD maintains the same back focus distance (146mm) as for F/10 and I thought that was a great idea. I assumed they would do the same thing for C-8 but they didn't.

I had to cancel the order for On-Axis Guider (ONAG) because ONAG will never meet the 105mm back focus. The absolute minimum with my equipment to work with ONAG is 115mm, but in reality, it would be more like 120mm. ONAG back focus is 66mm.

I am not a happy camper!

Peter


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Peter in Reno
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Re: CES is today... Celestron Edge HD FR? new [Re: Peter in Reno]
      #5615772 - 01/10/13 03:52 PM

Also, it's very convenient to have same back focus distance with or without focal reducer so I don't have to keep on changing my imaging equipment when changing focal ratios.

Peter


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Footbag
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Re: CES is today... Celestron Edge HD FR? new [Re: Peter in Reno]
      #5615776 - 01/10/13 03:55 PM

Are you thinking the reducer is 61mm long? In other words it replaces the T-adapter?

In that case, nothing but a T-ring would fit in there. Not even the new OAG. We'll see. You'd think they would want some extra space in there.


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Peter in Reno
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Re: CES is today... Celestron Edge HD FR? new [Re: Footbag]
      #5615787 - 01/10/13 03:58 PM

The back focus is 105mm from the back side (not front side where it meets the scope) of focal reducer. It does not include the length of the focal reducer itself.

You can fit the T-adapter in between FR and OAG/camera but you will most likely have to unscrew the second half of T-adapter to meet your BF requirement.

Peter


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Peter in Reno
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Re: CES is today... Celestron Edge HD FR? new [Re: Peter in Reno]
      #5615791 - 01/10/13 04:02 PM

From Celestron's web site description of their new focal reducer, it still looks better than Optec focal reducer. The imaging circle appears to be bigger than Optec. Celestron FR supports APS-C sensors which is a pretty good size CCD sensor. Plus Optec uses dovetail connection instead of SCT threaded connection. I prefer SCT threaded connection.

Peter


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Footbag
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Re: CES is today... Celestron Edge HD FR? new [Re: Peter in Reno]
      #5615797 - 01/10/13 04:05 PM

That would still give 61mm to play with, you need more then that?

And where does the line start forming?


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Peter in Reno
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Re: CES is today... Celestron Edge HD FR? new [Re: Footbag]
      #5615817 - 01/10/13 04:15 PM

As I said earlier, ONAG back focus is 66mm which is quite long. My camera BF is 14mm, filter wheel is 29mm, ONAG SCT adapter is 6mm, that gives an absolute minimum total back focus of 115mm. I think it will be closer to 120mm.

105mm back focus will work with my existing Hutech OAG. But the biggest inconvenience is taking apart the imaging equipment every time I change focal ratio. Celestron C-11/C-14 EdgeHD FR does not require changing back focus with or without FR. It seems to be implied by Celestron that they will maintain the same BF for C-8 EdgeHD but they didn't.

I am not using T-adapter. My understanding is you are planinng to use T-adapter.

Peter

Edited by Peter in Reno (01/10/13 04:16 PM)


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Footbag
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Re: CES is today... Celestron Edge HD FR? new [Re: Peter in Reno]
      #5615833 - 01/10/13 04:24 PM

Quote:

As I said earlier, ONAG back focus is 66mm which is quite long. My camera BF is 14mm, filter wheel is 29mm, ONAG SCT adapter is 6mm, that gives an absolute minimum total back focus of 115mm. I think it will be closer to 120mm.

105mm back focus will work with my existing Hutech OAG. But the biggest inconvenience is taking apart the imaging equipment every time I change focal ratio. Celestron C-11/C-14 EdgeHD FR does not require changing back focus with or without FR. It seems to be implied by Celestron that they will maintain the same BF for C-8 EdgeHD but they didn't.

I am not using T-adapter. My understanding is you are planinng to use T-adapter.

Peter




Yup. And I know what you are saying about changing out equipment when changing FR. The reason I went with the TSOAG9 is that it should allow me to switch it out easily without changing any distances.

I forgot about your ONAG. 66mm is a lot on top of your image train.


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Peter in Reno
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Re: CES is today... Celestron Edge HD FR? new [Re: Footbag]
      #5615839 - 01/10/13 04:29 PM

I do not have the ONAG. I order it last night but canceled the order this morning after reading about the shorty 105mm BF of new FR.

Peter


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Patrick
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Re: CES is today... Celestron Edge HD FR? new [Re: Peter in Reno]
      #5615849 - 01/10/13 04:37 PM

Quote:

From Celestron's web site description of their new focal reducer, it still looks better than Optec focal reducer. The imaging circle appears to be bigger than Optec. Celestron FR supports APS-C sensors which is a pretty good size CCD sensor. Plus Optec uses dovetail connection instead of SCT threaded connection. I prefer SCT threaded connection.





Peter,

Optec makes a f/r for the EdgeHD with 2" x 24 tpi threads, but I don't believe OPT carries it. All they carry is the one you're describing which must be a more 'universal' mounting. You can get one from APM in Germany for only 349,00 Eur. Optec 19409 for EdgeHD 8" ...22mm illuminated circle. Still not big enough for an APS-C, but big enough for the Atik 460EX sensor.

So, yes, the Celestron F/R still looks better.

Patrick

Edited by Patrick (01/10/13 04:41 PM)


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wolfman_4_ever
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Re: CES is today... Celestron Edge HD FR? new [Re: Patrick]
      #5615860 - 01/10/13 04:44 PM

That version is the 2" drawtube version. It works in any 2" focuser..

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Peter in Reno
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Re: CES is today... Celestron Edge HD FR? new [Re: Patrick]
      #5615866 - 01/10/13 04:46 PM

Optec FR has one side SCT thread, but not the other side. The other side is still a dovetail connection which requires Optec custom adapter which I hate. Optec FR BF distance is even shorter at 100mm. When will these companies figure out that it's tooooooooo short for most imagers?

Peter


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Patrick
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Re: CES is today... Celestron Edge HD FR? new [Re: Peter in Reno]
      #5616031 - 01/10/13 06:35 PM

Quote:

Optec FR has one side SCT thread, but not the other side. The other side is still a dovetail connection which requires Optec custom adapter




Ahh...


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