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AntarcticDave
sage
Reged: 02/03/09
Loc: Denver, CO
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IEQ75
#4511311 - 04/11/11 02:05 PM
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I just noticed this on iOptron's site:
IEQ75
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mclewis1
Thread Killer
Reged: 02/25/06
Loc: New Brunswick, Canada
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Re: IEQ75
[Re: AntarcticDave]
#4511377 - 04/11/11 02:36 PM
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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
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Re: IEQ75
[Re: AntarcticDave]
#4511699 - 04/11/11 05:27 PM
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Quote:
I just noticed this on iOptron's site:
IEQ75
Yeah...but ".3" _what_...seconds? Minutes? Degrees? 
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mistyridge
Carpal Tunnel
Reged: 10/28/05
Loc: Loomis, CA
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Re: IEQ75
[Re: rmollise]
#4511842 - 04/11/11 06:34 PM
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Looks like a white CGE with chrome.
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jrcrilly
Refractor wienie no more
Reged: 04/30/03
Loc: NE Ohio
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Re: IEQ75
[Re: rmollise]
#4511916 - 04/11/11 07:15 PM
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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
Pooh-Bah
Reged: 05/24/07
Loc: Southern Tier NY
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Re: IEQ75
[Re: mistyridge]
#4511960 - 04/11/11 07:39 PM
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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
sage
Reged: 11/23/05
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Re: IEQ75
[Re: jrcrilly]
#4512013 - 04/11/11 08:13 PM
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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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