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RASA 11 - center lens array (rotates)?

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4 replies to this topic

#1 Ron in Michigan

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Posted 15 August 2019 - 04:38 PM

I have a RASA 11 and have not been able to get a flat in focus field from edge to edge. After much tweaking of spacing and adding Baader UFC I now get center and left side in focus and the right side of the full frame sensor has donuts (out of focus),
When I change cameras or spacing and I rotate things on (extensions etc) the enter unit rotates.  IS this something they aligned carefully at the factory?  Or does it not matter how much it rotates?
I don't feel I should have this much problem with a 3500. scope that is designed for imaging. 

I just read a early review and the reviewer said his center lens array rotated and Celestron said to swap the scope for a new one.  Is that necessary? 

 



#2 DuncanM

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Posted 15 August 2019 - 05:14 PM

Contact Celestron.  I don't think the lens should rotate.


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#3 Benni123456

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Posted 17 August 2019 - 09:55 AM

my god 3500 dollar and then completely lousy build.

What is Celestron thinking. Just cost saving at any price.

 

I wonder who builds these scopes together. Foxcon is known to use schoolchildren who are told they do  not get their degree when they do not work. Do they have similar practices at Celestron?



#4 kingjamez

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Posted 17 August 2019 - 03:07 PM

my god 3500 dollar and then completely lousy build.
What is Celestron thinking. Just cost saving at any price.

I wonder who builds these scopes together. Foxcon is known to use schoolchildren who are told they do not get their degree when they do not work. Do they have similar practices at Celestron?


Blow things out of proportion much?

#5 Astrojedi

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Posted 19 August 2019 - 08:34 AM

I have a RASA 11 and have not been able to get a flat in focus field from edge to edge. After much tweaking of spacing and adding Baader UFC I now get center and left side in focus and the right side of the full frame sensor has donuts (out of focus),
When I change cameras or spacing and I rotate things on (extensions etc) the enter unit rotates.  IS this something they aligned carefully at the factory?  Or does it not matter how much it rotates?
I don't feel I should have this much problem with a 3500. scope that is designed for imaging. 

I just read a early review and the reviewer said his center lens array rotated and Celestron said to swap the scope for a new one.  Is that necessary? 

No the secondary assembly is not supposed to rotate. Sometimes the gasket comes lose. A rotating secondary assembly makes it almost impossible for the scope to hold optical alignment. You need to contact Celestron.




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