Celestron Nexstar 8i


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Celestron Nexstar 8i
I decided for this new icomp model because of some comments I read about its better tracking/backlash in comparison with the old Nexstar 8.
What a deception !
The backlash of this telescope is a real nightmare, I noticed severe "jumps" in altitude movements , it is even more jerky than the Nexstar 8.
The tracking is still terrible, you can't track an object in the FOV with the standard 25mm eyepiece for more than 5 minutes.
Even with the new autoguided port I have serious doubts about imaging with this kind of telescope.
Also the price is not that good because I had to spend more U$ 149,00 for the upgraded HC and U$ 169,00 for the tripod.
I'm very disapointed with this "new" model from Celestron and I will try to replace it for an LX90 with my dealer.

Overall Rating: 6
Optics:7 Mount:5 Ease of Use:7 Value:5
Weight: 5 (Veritable Vote)
Date:
By: RobertFos
Link to this vote: http://www.excelsis.com/1.0/displayvote.php?voteid=130192

>I decided for this new icomp model because of some comments I read about its better tracking/backlash in comparison with the old Nexstar 8.
>What a deception !
>The backlash of this telescope is a real nightmare, I noticed severe "jumps" in altitude movements , it is even more jerky than the Nexstar 8.
>The tracking is still terrible, you can't track an object in the FOV  with the standard 25mm eyepiece for more than 5 minutes.
>Even with the new autoguided port I have serious doubts about imaging with this kind of telescope. 
>Also the price is not that good because I had to spend more U$ 149,00 for the upgraded HC and  U$ 169,00 for the tripod.
>I'm very disapointed with this "new" model from Celestron and I will try to replace it for an LX90 with my dealer.

Reply:  Spend more time with the set up (i.e. leveling, proper time and insuring that the 2 guide stars don't drift and you may see a difference.  My 8i is great. I upgraded to the heavy duty mount.  Don't be too hasty switching to Meade.  Mine ties a CG11 I once looked through as the best optics in a SCT that I've ever seen.  Meade can't match it optically.

Celestron Nexstar 8i
I bought the 8i to have an instrument of reasonable aperature in a portable package (I had previously owned a Nexstar 8, sold it, and later regretted doing so). At 35 lbs setup, this is about 10 lbs lighter than any other 8". I am impressed with the improvements Celestron has made to the original NexStar 8.

First, the tripod is very solid, and combined with vibration suppression pads, provides a damping time of about 1 second at 200x.

Optically, it is excellent - Celestron appears to take great care to produce high quality optics. If anything, the optics appear to be better than my previous NexStar 8.

The computer hand controller has the upgraded database, and is very easy to use. It does not have all of the whistles and bells the Meade Autostar has, but in the field, I believe it is actually easier to use.

The 8i's GOTO capability is superb, and this may be the single greatest improvement Celestron has made to this instrument. Alignment is easy, GOTO's very accurate (it will put objects near the center of the FOV at 117x), and tracking very good for this type of setup. The tracking motors are quieter than in the Nexstar 8. In comparison to a Meade'd Autostar on an LXD55 mount, the 8i acquires an object much faster.

Other nice features include a buttery smooth focuser that shows no evidence of mirror shift, and a very high overall quality of construction throughout.

The only negatives I find are the manner in which the hand controller is stored (it looks nice but is difficult to access) and the lack of some features in the hand controller computer (inability to download upgrades and observation lists, inability to adjust brightness of display, etc.).

Overall, this is an excellent telescope for the money, and I have to give it a 10 in recognition of the trmendous value it represents.

(For comparison, I also own a Meade AR-6 6" refractior and a Meade ETX90 RA. These instruments form the basis of some of opinions abou the 8i).

Overall Rating: 10
Optics:10 Mount:10 Ease of Use:10 Value:10
Weight: 7 (Veritable Vote)
Date:
By: JKZimm
Link to this vote: http://www.excelsis.com/1.0/displayvote.php?voteid=216537

Do you know the primary difference between the Nexstar 8 and the Nextar 8i?
Thanks.
>I bought the 8i to have an instrument of reasonable aperature in a portable package (I had previously owned a Nexstar 8, sold it, and later regretted doing so).  At 35 lbs setup, this is about 10 lbs lighter than any other 8".  I am impressed with the improvements Celestron has made to the original NexStar 8.
>
>First, the tripod is very solid, and combined with vibration suppression pads, provides a damping time of about 1 second at 200x.
>
>Optically, it is excellent - Celestron appears to take great care to produce high quality optics.  If anything, the optics appear to be better than my previous NexStar 8.
>
>The computer hand controller has the upgraded database, and is very easy to use.  It does not have all of the whistles and bells the Meade Autostar has, but in the field, I believe it is actually easier to use.
>
>The 8i's GOTO capability is superb, and this may be the single greatest improvement Celestron has made to this instrument.  Alignment is easy, GOTO's very accurate (it will put objects near the center of the FOV at 117x), and tracking very good for this type of setup.  The tracking motors are quieter than in the Nexstar 8.  In comparison to a Meade'd Autostar on an LXD55 mount, the 8i acquires an object much faster.
>
>Other nice features include a buttery smooth focuser that shows no evidence of mirror shift, and a very high overall quality of construction throughout.
>
>The only negatives I find are the manner in which the hand controller is stored (it looks nice but is difficult to access) and the lack of some features in the hand controller computer (inability to download upgrades and observation lists, inability to adjust brightness of display, etc.).
>
>Overall, this is an excellent telescope for the money, and I have to give it a 10 in recognition of the trmendous value it represents.
>
>(For comparison, I also own a Meade AR-6 6" refractior and a Meade ETX90 RA.  These instruments form the basis of some of opinions abou the 8i).

Celestron Nexstar 8i
Love my 8i; the optics are superb! The light weight makes it ideal for this 54 year old guy wewith a herniated disc. I use it with kohki widescans and a 10mm Speers waler along with celestron Binoviewers. Some backlash but i am refining the problem by working with antiback lash settings. Overall a 9.5

mike Anderer

St. Charles, Ill

Overall Rating: 9
Optics:9 Mount:9 Ease of Use:10 Value:9
Weight: 1 (Unreliable Vote)
Date:
By: Anonymous (xxx.xxx.224.7)
Link to this vote: http://www.excelsis.com/1.0/displayvote.php?voteid=232215


Celestron Nexstar 8i
Good optics, portable, excellent tracking. The one arm mount is only good for visual, but hey, if you want astrophotography this is not the scope for you. Tracking is dead on as long as you align correctly. There is a little backlash, which can be corrected in the backlash settings in the menu. I have not bothered though because its not that bad. There is virtually no mirror shift. Overall, excellent setup.

Overall Rating: 9
Optics:9 Mount:7 Ease of Use:9 Value:9
Weight: 1 (Unreliable Vote)
Date:
By: Anonymous (xxx.xxx.1.162)
Link to this vote: http://www.excelsis.com/1.0/displayvote.php?voteid=350245

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