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Equipment Discussions >> Mounts

Pages: 1
AntarcticDave
sage


Reged: 02/03/09

Loc: Denver, CO
IEQ75 new
      #4511311 - 04/11/11 02:05 PM

I just noticed this on iOptron's site:
IEQ75


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mclewis1
Thread Killer
*****

Reged: 02/25/06

Loc: New Brunswick, Canada
Re: IEQ75 new [Re: AntarcticDave]
      #4511377 - 04/11/11 02:36 PM

I'll go out on a limb and suggest that the .3 arc/s "tracking error" is likely the accuracy of the motors/encoders, and that the mount will demonstrate a different number in actual use.

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rmollise
Postmaster
*****

Reged: 07/06/07

Re: IEQ75 new [Re: AntarcticDave]
      #4511699 - 04/11/11 05:27 PM

Quote:

I just noticed this on iOptron's site:
IEQ75




Yeah...but ".3" _what_...seconds? Minutes? Degrees?


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mistyridge
Post Laureate
*****

Reged: 10/28/05

Loc: Loomis, CA
Re: IEQ75 new [Re: rmollise]
      #4511842 - 04/11/11 06:34 PM

Looks like a white CGE with chrome.

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jrcrillyAdministrator
Refractor wienie no more
*****

Reged: 04/30/03

Loc: NE Ohio
Re: IEQ75 new [Re: rmollise]
      #4511916 - 04/11/11 07:15 PM

Quote:

Yeah...but ".3" _what_...seconds? Minutes? Degrees?




The claim is .3 arcseconds due to corrections from hi-res encoders on the RA axis. Such systems exist, and some of them work. We may never know about this one; I've heard no reports of beta test units in the field. Apparently they won't actually build one until someone takes a chance on a $3000 deposit. I don't see how tacking such a thing onto a mount from a company with a history of producing only low-end gear will suddenly make it sufficiently attractive compared to a Bisque or AstroPhysics mount at a similar price for that to happen.

They aren't wording the claim correctly anyway. What the system can control is tracking RATE error. There are many other factors affecting tracking error.


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Phil Cowell
Carpal Tunnel
*****

Reged: 05/24/07

Loc: Southern Tier NY
Re: IEQ75 new [Re: mistyridge]
      #4511960 - 04/11/11 07:39 PM

Quote:

Looks like a white CGE with chrome.




Only holds 75#, the CGE Pro is 90# capacity. IOptron are not a Synta company. Looks to me like they tried to copy an AP mount. In the same price range as an AP 900GTO as well.


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gdd
Pooh-Bah


Reged: 11/23/05

Loc: N Seattle suburb, WA
Re: IEQ75 [Re: jrcrilly]
      #4512013 - 04/11/11 08:13 PM

Quote:

The claim is .3 arcseconds due to corrections from hi-res encoders on the RA axis. Such systems exist, and some of them work.




By themselves they require very accurate PA. I don't recall where the specs say whether the encoder solution works well with autoguiding to compensate for PA, flexure and other errors. It should work well with an AO8.


Gale


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