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curiosidad
sage


Reged: 06/09/11

ETX 90 like soptting scope?
      #5559678 - 12/07/12 05:51 PM

Hello,
Anyone use this ETX 90 optical tube like a spotting scope for day birding?
Good results?
Thanks


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jgraham
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Reged: 12/02/04

Loc: Miami Valley Astronomical Soci...
Re: ETX 90 like soptting scope? new [Re: curiosidad]
      #5560041 - 12/07/12 10:08 PM

It should work fine on a good tripod. I've used the Orion 90mm tabletop Mak as a spotting scope and it worked very well.

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moynihan
Carpal Tunnel


Reged: 07/22/03

Loc: Lake Michigan Watershed
Re: ETX 90 like soptting scope? new [Re: jgraham]
      #5560551 - 12/08/12 09:21 AM

I have used an ETX 90 OTA as a spotting scope, when i needed high magnification and a good stand off distance. Found it to work well.

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dengwer
sage


Reged: 02/14/06

Loc: Texas
Re: ETX 90 like soptting scope? new [Re: moynihan]
      #5561512 - 12/08/12 09:08 PM

We take photos through my wife's ETX90 out of our car window using a sony cybershot and 40mm eyepiece. Here is one example of hundreds of pics.

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dengwer
sage


Reged: 02/14/06

Loc: Texas
Re: ETX 90 like soptting scope? new [Re: dengwer]
      #5561523 - 12/08/12 09:18 PM Attachment (96 downloads)

oops now to upload photo

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Geo.
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Reged: 10/01/08

Loc: Upstate NY
Re: ETX 90 like soptting scope? new [Re: dengwer]
      #5562345 - 12/09/12 12:21 PM

I keep one at the lake on a DS2000 mount for use as a spotter and observing. The 45 deg. erect image diagonal is best for spotting.

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moynihan
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Reged: 07/22/03

Loc: Lake Michigan Watershed
Re: ETX 90 like soptting scope? new [Re: dengwer]
      #5562493 - 12/09/12 01:48 PM

Quote:

oops now to upload photo




Very nice


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FeynmanFan
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Reged: 02/18/11

Loc: N Colo front range
Re: ETX 90 like soptting scope? new [Re: moynihan]
      #5562539 - 12/09/12 02:15 PM

They make great spotting scopes. I use mine as such when target shooting. If you think night time thermals are bad, try looking across 100 yards of sun-baked prairie!

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seeindoubles
super member


Reged: 01/15/12

Loc: Pacific Northwest-Oregon
Re: ETX 90 like soptting scope? new [Re: FeynmanFan]
      #5886530 - 05/27/13 03:10 AM Attachment (54 downloads)

Mine works great for birding. Just took this shot of the Western Tanager that hangs out in the backyard today. Used my Canon EOS with remote release through my PC.

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cpsTN
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Reged: 04/26/07

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Re: ETX 90 like soptting scope? new [Re: seeindoubles]
      #5886798 - 05/27/13 10:32 AM

I have a SkyWatcher 90mm Mak (1250mm FL) and Orion's F2-HD tripod and I use it with a 25mm EP (50x) or a 40mm EP (32x) for birding, plane watching, etc. Works great. This is the same one as the Orion Apex 90 I used to have. The ETX (used to own as well) should work better due to better optics.

Edited by cpsTN (05/27/13 10:35 AM)


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REC
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Reged: 10/20/10

Loc: NC
Re: ETX 90 like soptting scope? new [Re: curiosidad]
      #5886899 - 05/27/13 11:20 AM

Yep, have mine now for 15 yrs. and still works great! Keep it on a lightweight tripod all the time ready to check out the birds ans also have a solar filter in it for sunspots.

Bob


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Mike Cook
super member


Reged: 07/13/08

Loc: Moncton NB (Cloud Central)
Re: ETX 90 like soptting scope? new [Re: REC]
      #5887319 - 05/27/13 03:25 PM

I've used my ETX 125PE to bird watch. Focusing can be slow, spinning the focus knob quite a bit but I have a lot of fun with it.

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highertheflyer
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Reged: 07/08/05

Loc: Ft. Worth, Texas
Re: ETX 90 like soptting scope? new [Re: Mike Cook]
      #5887682 - 05/27/13 07:07 PM

Can one show us your camera to ETX setup?
I have a number of these and would like to capture views like yours.
Jim


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seeindoubles
super member


Reged: 01/15/12

Loc: Pacific Northwest-Oregon
Re: ETX 90 like spotting scope. new [Re: highertheflyer]
      #5888234 - 05/28/13 01:02 AM

I use a Meade rear cell adapter that I purchased from OPT for $19.95. I have attached a photo here. It screws onto the threads of the sub-diameter rear port. Once installed it allows use of standard SCT accessories including photo adapters, eyepiece holders and even off axis guiders. For photos I use a SCT prime focus adapter coupled to my camera. For a slightly wider field of view I thread on my Celestron focal reducer first, then couple the prime focus adapter to the back of that. You gain perhaps 15% extra field of view that way on the ETX. The Tanager photo I posted earlier was from about 45 feet with just the SCT prime focus adapter.

Edited by Starman27 (06/24/13 08:31 AM)


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seeindoubles
super member


Reged: 01/15/12

Loc: Pacific Northwest-Oregon
Re: ETX 90 like spotting scope. new [Re: seeindoubles]
      #5888269 - 05/28/13 01:44 AM Attachment (56 downloads)

Attached is a shot of my setup showing the Celestron F6.3 focal reducer threaded to the ETX rear cell adapter and the SCT prime focus adapter attached to the rear of the focal reducer, coupled to my Canon EOS XS. This combination gives maybe 15% more field of view with the ETX90 than without the reducer. I use this for birding shots and also used the same combination to record the Venus transit last May. For quick and dirty I just thread on the prime focus adapter and the camera.

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Ekyprotic
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Reged: 11/28/12

Re: ETX 90 like spotting scope. new [Re: seeindoubles]
      #5934034 - 06/22/13 01:44 AM

Thanks for uploading these images! Can this combo also be used for wide field astro work? I have the Celestron 6.3 reducer I use with my 8 SE, can I use it similarly (with an SCT correct image diagonal) on my ETX 90? One problem I can see would be to view targets near the zenith, I dont think the rear view port has enough clearance for the base of the mount.

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seeindoubles
super member


Reged: 01/15/12

Loc: Pacific Northwest-Oregon
Re: ETX 90 like spotting scope. new [Re: Ekyprotic]
      #5934437 - 06/22/13 11:31 AM

Maybe snapshots of the moon (or sun with filter). The drive isn't good enough for long exposure photography-too much periodic error and too unsteady. However you can use a Canon EOS camera using a utility called Backyard EOS to record webcam movies of the planets with it with some success. Even with the jerky drive it will still work as you can keep only the frames where the image was steady. I was able to do a few decent shots of the Venus tranit last year in this manner. Wide field visual work could be done with the appropriate SCT adapter and eyepeices at the camera port though. I am actually planning to use my OTA for a guide scope as soon as the mount rings arrive.

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seeindoubles
super member


Reged: 01/15/12

Loc: Pacific Northwest-Oregon
Re: ETX 90 like spotting scope. new [Re: seeindoubles]
      #5934449 - 06/22/13 11:36 AM Attachment (40 downloads)

This isn't birding but does demonstrate the capabilities of my setup. This shot of the Venus transit last year was made with this setup plus a full aperture solar filter. This is one frame of a webcam movie made running Backyard EOS which allows you to use the Live-View feed to record webcam movies, even if your Canon model cannot normally record video.

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*skyguy*
Carpal Tunnel
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Reged: 12/31/08

Loc: Western New York
Re: ETX 90 like spotting scope. new [Re: seeindoubles]
      #5934582 - 06/22/13 12:57 PM Attachment (38 downloads)

I have an ETX-125 and a very handy photography accessory to own is the Zhumell 8-24mm zoom eyepiece ($60). It has a male T-thread located under the rubber eye guard that will screw into any DSLR or camera that has a T-thread adapter. Also, the zoom (magnification) can be adjusted on-the-fly without changing the camera's orientation. The posted image shows a water tower 2 miles away with my DSLR attached at prime focus and then with eyepiece projection using the zoom from 24mm to 8mm.

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Ekyprotic
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Reged: 11/28/12

Re: ETX 90 like spotting scope. new [Re: *skyguy*]
      #5935566 - 06/22/13 11:31 PM

what's the longest exposure you can do if you use the table top tripod in equatorial mode with the etx 90? 30 seconds?

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seeindoubles
super member


Reged: 01/15/12

Loc: Pacific Northwest-Oregon
Re: ETX 90 like spotting scope. new [Re: *skyguy*]
      #5935696 - 06/23/13 01:11 AM

Wow, that's pretty slick! Now I have an excuse to purchase yet one more astro-accessory

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seeindoubles
super member


Reged: 01/15/12

Loc: Pacific Northwest-Oregon
Re: ETX 90 like spotting scope. new [Re: Ekyprotic]
      #5935728 - 06/23/13 01:37 AM

Probably no more than one or two seconds, maybe ten. That is why I resorted to webcam photography, which has actually worked quite well with the ETX. BTW, this is the original ETX model that had just a simple clock drive with no electronic fine adjustments available. You probably could do better with one of the newer computerized ETX90 or 125 models.

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Ekyprotic
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Reged: 11/28/12

Re: ETX 90 like spotting scope. new [Re: seeindoubles]
      #5935769 - 06/23/13 02:17 AM

Yea I bought the ETX 90 ASTRO M model (I think that's what it is called lol- also called ETX 90 RA ?) from Classifieds awhile back. I have a DSI PRO II and an LPI, which would work with this model...... but since I heard it wasn't upgradeable to the computerized version I went ahead and bought accessories which are supposed to make it compatible with the Nexstar SE mount. I have yet to get around to deforking the OTA and putting it on that mount. I hope I'll get better results with imaging with it on the SE mount than I've gotten so far with my 8" SE (an 8" OTA is just a bit too heavy for that mount.) One thing that I do like is that the 8" + 6.3 FR is very close to the ETX 90 in focal length.

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seeindoubles
super member


Reged: 01/15/12

Loc: Pacific Northwest-Oregon
Re: ETX 90 like spotting scope. new [Re: Ekyprotic]
      #5935786 - 06/23/13 02:29 AM

I used my ETX for quite a while on a Synta EQ5GT (Skywatcher) mount. I just bolted a Vixen dovetail to the tripod base on the main tube of the ETX90 and it worked great. I finally sold the Synta mount and remounted the OTA on the orignal forks after disassembly and some tuning. I plan to disassemble the fork mount again and build in my own RA clutch-there is room to do it. If it works, it will allow the drive to work more smoothly and with more flexibility than it was originally designed for. I will post those mods later for folks to benefit from too!

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Ekyprotic
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Reged: 11/28/12

Re: ETX 90 like spotting scope. new [Re: seeindoubles]
      #5935835 - 06/23/13 03:20 AM

Thanks I would love to do that myself! There is some artistic elegance in the original mount that I really like. I'd feel sad to defork it from that mount.

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redlinedb16a
super member


Reged: 10/17/10

Re: ETX 90 like spotting scope. new [Re: Ekyprotic]
      #5988734 - 07/24/13 11:39 PM

I deforked my etx90ra(simply unscrewing 4 screws)and put it on a camera tripod,it's mag power is too strong for objects closer than 300' though
A bird at 500' is almost too large for the feild of view


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dengwer
sage


Reged: 02/14/06

Loc: Texas
Re: ETX 90 like spotting scope. new [Re: redlinedb16a]
      #5989803 - 07/25/13 03:23 PM

a 40mm eyepiece gives about 30X. good down to about 40ft.

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Christopher EricksonModerator
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Re: ETX 90 like spotting scope. new [Re: dengwer]
      #5991718 - 07/26/13 05:43 PM

Quote:

a 40mm eyepiece gives about 30X. good down to about 40ft.




In 1.25", 40mm eyepieces don't show you any more true field of view than a 32mm eyepiece.

They just show it to you smaller.


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*skyguy*
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Reged: 12/31/08

Loc: Western New York
Re: ETX 90 like spotting scope. new [Re: Christopher Erickson]
      #5991929 - 07/26/13 08:30 PM

Quote:

Quote:

a 40mm eyepiece gives about 30X. good down to about 40ft.




In 1.25", 40mm eyepieces don't show you any more true field of view than a 32mm eyepiece.

They just show it to you smaller.




Smaller, but brighter!


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redlinedb16a
super member


Reged: 10/17/10

Re: ETX 90 like spotting scope. new [Re: *skyguy*]
      #5993634 - 07/27/13 08:44 PM



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Ekyprotic
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Reged: 11/28/12

Re: ETX 90 like spotting scope. new [Re: Ekyprotic]
      #6321602 - 01/19/14 03:16 AM

Sorry to revive an old thread but I am about to get the Meade SCT adapter fpor the ETX and they said to get the eyepiece holder too- cant I use the eyepiece holder that I use with my 8SE on the ETX 90?

Another question, is there any vignetting with the ETX 90 and the 6.3 Celestron FR when used with a 32mm Plossl? What is the widest possible true field of view with this combo?

I also saw a Scopetronix f/6.9 (halves the f number doubles the field of view?) being mentioned here- not sure if it is available anymore

http://zengine.ho8.com/hardware.htm

Scopetronix ETX Focal Reducer, F/13.8 to F/6.9...this little beauty doubled the field of view of my ETX90!

http://zengine.ho8.com/Scopetronix-ETX-Focal--Redu.jpg

another advantage of this would be no need to get the SCT adapter (maybe I could just use the top port?) something I worry with using the rear cell is getting dust inside the OTA- is this an issue?


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Ekyprotic
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Reged: 11/28/12

Re: ETX 90 like spotting scope. new [Re: Ekyprotic]
      #6321605 - 01/19/14 03:19 AM

Here he mentions using a 6.3 Celestron FR but says the field of view is almost doubled!

http://www.weasner.com/etx/techtips/sct.html


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Ekyprotic
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Reged: 11/28/12

Re: ETX 90 like spotting scope. new [Re: Ekyprotic]
      #6321611 - 01/19/14 03:29 AM

I also have an Orion .5 reducer that screws onto a DSI camera, can this also be used visually?

Also, does the Celestron .63 FR perform field flattening as well as reducing or do MAKs not need field flattening like SCTs do?


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