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Star Alignment Precision on CEM40 - Think I Found the Problem

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#1 RandallK

RandallK

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Posted 12 September 2019 - 02:22 PM

I have not been completely happy with my goto star alignments with the CEM40. As usual I cannot prove it yet due to the September clouds rolling in but.....there are markings on the saddle which I haven't really paid to much attention with. With the mount c/w shaft pointed ahead of you, the saddle has two hex screws on the left hand side to push/pull the long portion of the saddle grip. I noticed that the bottom was at least one unit off from the upper one.

 

Being that the mount was shipped with the Vixen configuration, I had no reason to really check the alignment of the saddle, thinking it was done at the factory.

 

I think this is what's creating a "false" cone error and why the selected alignment star was consistently off. The manual really doesn't give any reason as to what would cause the alignment to be off. I don't know how the other CEM's have the saddle configured, but if it is the same as the CEM40's, I think this is where you should look to check that both ends are in alignment.

 

IMG_0049_1.jpg     IMG_0050_1.jpg

 

As you can see, they are both in alignment now.

 

Comments welcome, and I will report back on this as soon as I get clear skies again.

 

Hope this helps and if you find yours is out as well, please let me know. 


Edited by RandallK, 12 September 2019 - 07:02 PM.

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#2 bobzeq25

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Posted 12 September 2019 - 02:52 PM

Another point.  iOptron's do  a sequential alignment, that is, they also use previous alignments to mix with the current one.  So errors tend to persist.

 

"Alignment - Clear Alignment Data" lets you start from scratch.


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#3 F.Meiresonne

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Posted 13 September 2019 - 06:58 AM

Yes I have read this too.

 

So not to 'confuse' the mount too much  I always now perform first a 'clear alignment data' on my IEQ30 pro. Initialise! Always a good thing with software, that's why  you have t restart your windows pc so oftengrin.gif folks!

On every occasion I have to build it up because it is not permanent mounted so every setup is a little different.

 

I am still experimenting with it, re-aligned my polar scope last weekend and hopefully can test it this evening on a clear night.. so ;I am not out off the bush yet , but if it works ,it does work...;and the GOTO are exquisite




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