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Meade LX50 main mirror "arrow"

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#1 Sniuk

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Posted 17 September 2021 - 02:28 AM

Hi all, 

 

a while back I dissassambled my Lx50 8" SCT for cleaning.  

and when took off the main mirror I saw this arrow on the back... and wonder..

where should it point to ? In the past when I wiped a bit without taking off the mirror

it seemed to rotate a bit..  But now I wonder, where should it point? To the Focuser axis ? 

to the corrector plate mark on the front of the tube? 

 

LX50 Mirror.jpg

 

I'm having very soft images even though My colimation seems good. 

Any ideas? 

 

thanks! 

 

Carles. 



#2 happylimpet

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Posted 17 September 2021 - 02:37 AM

To the same place it pointed when it was put there, or failing that, the same place it pointed when you dismantled it. I dont know if theres a standard for where arrows point in this context.


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#3 Sniuk

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Posted 17 September 2021 - 02:56 AM

To the same place it pointed when it was put there, or failing that, the same place it pointed when you dismantled it. I dont know if theres a standard for where arrows point in this context.

Thanks for your reply, 

 

but I don't know when it pointed at originally, that's why I ask.  I know for certain that the mirror was "loose" and even without dismantle it could rotate (as mentioned, just by wiping it with a cleaning fluid and cloth, I know it moved.) 

 

if the arrow is there, must be for a reason... since the corrector plate and main mirror have to be well aligned. I have a mark in the OTA by the corrector plate, so that is not a problem, but if the mirror is rotated, then how do I know how to align it ? 



#4 happylimpet

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Posted 17 September 2021 - 04:27 AM

Thanks for your reply, 

 

but I don't know when it pointed at originally, that's why I ask.  I know for certain that the mirror was "loose" and even without dismantle it could rotate (as mentioned, just by wiping it with a cleaning fluid and cloth, I know it moved.) 

 

if the arrow is there, must be for a reason... since the corrector plate and main mirror have to be well aligned. I have a mark in the OTA by the corrector plate, so that is not a problem, but if the mirror is rotated, then how do I know how to align it ? 

Yeah, my reply wasnt really helpful, sorry, I was just trying to make the point that we dont know. Unless there is some widespread standard for this, which I doubt. I put marks and arrows on my stuff and even I cant remember what it signified 6 months later.

 

If you were marking the alignment, what would you point it to? Surely the most obvious and sensible thing.....



#5 Sniuk

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Posted 17 September 2021 - 04:40 AM

Yeah, my reply wasnt really helpful, sorry, I was just trying to make the point that we dont know. Unless there is some widespread standard for this, which I doubt. I put marks and arrows on my stuff and even I cant remember what it signified 6 months later.

 

If you were marking the alignment, what would you point it to? Surely the most obvious and sensible thing.....

Well, I don't know, I was hoping someone with experience cleaning/dismantlying Meade SCT would perhaps know.

 

I would guess is the foccuser knob.. and I've aligned it like so, but not happy with how the images looks. 


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