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Analyzing iEQ45 Pro RA performance

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#1 freiform

freiform

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Posted 04 June 2020 - 03:20 AM

Hi,

 

maybe someone can help me analyzing the RA performance of my mount. I bought it used last weekend, and while I can get a (ASCOM-) guided RMS of around 0.8" to 0.9", I think (or wish) it could perform a little bit better.

 

ieq45pro-RAraw.png

 

Looking at the logs, I get a peak of 7.1" (~14" pp) with a period of 336.8s, which is spot on for the PE interval of 336.6s calculated from the 256 teeth of the RA worm wheel. Looking at the logs also shows that I probably could increase the settling time after dithering.

 

Anyway, I wonder if I could reduce the magnitude of the PE a bit. Browsing the Web, I found different vaules and claims for the iEQ45Pro ranging from 4" (propably not pp) to 32". Any Ideas? 

 

I read that PEC & Autoguiding do not work together with this mount?

 

Thanks for any hints

Sven

 

 

 

 

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#2 Tapio

Tapio

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Posted 04 June 2020 - 04:46 AM

What is your scope & camera ?

I wouldn't bother too much with pe curves and numbers. What you have now sounds good for mount of this class.

And as long stars look good in your images...



#3 freiform

freiform

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Posted 04 June 2020 - 05:27 AM

It carries an 72/432 ED with an ASI183MM Pro, so I am at 1.15" per pixel. I'd prefer a but more headroom with respect to RMS. Having said that, that PE should guide out anyway. sp maybe there's other knobs to tweak general guiding performance.

 

Sven



#4 Tapio

Tapio

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Posted 04 June 2020 - 06:17 AM

If you like tweaking you might want to try Predictive PEC.

Mind you, if RA and DEC results differ too much then that can produce oblong stars too.




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