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Mxplx2
sage


Reged: 09/12/12

Loc: PA USA
Newb ETX 90 Questions new
      #6002798 - 08/02/13 08:58 AM


Iíve been looking at the ETX 90, and it looks like a good compromise between portability, magnification and price. So I have a few questions.

1. Can it be conveniently used for quick looks without going through an alignment? Iím talking about either being manually positioned with power off, or positioned using the buttons with power on.

2. What power EPís should I get to take full advantage of its capabilities.


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jgraham
Postmaster
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Reged: 12/02/04

Loc: Miami Valley Astronomical Soci...
Re: Newb ETX 90 Questions new [Re: Mxplx2]
      #6002921 - 08/02/13 10:17 AM

1. Yes, but the mount is a bit stiff to move manually. For quickie views of the moon I used to rough in it manually, then use the motors to tweak it with the hand controller. (You can turn on the hand controller and skip the alignment.) A good Plan-B is to do a good job calibrating the motors, training the drives, and aligning the mount. When you are finished observing use the park function. The next time you set up start with the telescope in the home position and the GoTos will be roughly correct and the tracking will be good enough for visual observing. To align the scope you don't need to god through the full alignment, just synch it on a guide star and you're good to go. In some cases I haven't done a full alignment of my Autostar scopes in over a year, and when I do it is because I forgot to park the scope before turning it off.

2. The usual set; eyepieces in the 6-32mm range with a good 2x barlow. I don't know what a good modern wide field 1.25" eyepiece is, but I like my trusty old Meade RG 20mm Erfle.


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Geo.
Carpal Tunnel
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Reged: 10/01/08

Loc: Upstate NY
Re: Newb ETX 90 Questions new [Re: jgraham]
      #6003757 - 08/02/13 07:03 PM

When the ETX was first introduced the Autostar was an option and the mount was controlled by the EC (electronic controller). The EC would drive the RA at the sidereal rate and had four selectable slew rates. It permitted NSEW correction switches. They often sell for under $20 used.

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redlinedb16a
sage


Reged: 10/17/10

Re: Newb ETX 90 Questions new [Re: Geo.]
      #6004013 - 08/02/13 09:40 PM

Here's what you do

Unscrew 4 screws

Presto the ota comes off

Onto a cheap camera tripod
I do it all the time,super fast and portable


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Mxplx2
sage


Reged: 09/12/12

Loc: PA USA
Re: Newb ETX 90 Questions new [Re: redlinedb16a]
      #6004548 - 08/03/13 10:34 AM

Quote:

Here's what you do

Unscrew 4 screws

Presto the ota comes off

Onto a cheap camera tripod
I do it all the time,super fast and portable





And a Bud Lite in the star light. I love it.


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Hitech
sage
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Reged: 06/03/10

Loc: NW PA.
Re: Newb ETX 90 Questions [Re: Mxplx2]
      #6008944 - 08/06/13 08:29 AM

When I had mine I limited EP choice to 12mm. It was a good compromise for detail and FOV. 9mm started pushing limits of good resolution and this is using both orthoscopic or Meade 4000 Plossl. I used mine in manual mode lots of times for a quick gaze at the heavens. However I never drank beer when star gazing--- telescope optics themselves present enough hurdles to overcome for good viewing without the need to induce double vision!

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