#1  
Old 05-07-2018, 09:52 PM
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sungrazer (Karen)
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mirror shift

Hi

I have an LX200gps 10 f10.

I've been looking at using it for some photography but I am finding that when I slew from one object to another the focus shifts. Not such a big deal for visual but annoying - I have the mirror lock on so I am a little surprised as to how/why this occurs?

Can anyone direct me to a resource? - how can I tighten this up. I would have thought once I engaged the mirror lock the focus would hold from east to west.

thanks
Karen
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  #2  
Old 06-07-2018, 08:28 AM
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Merlin66 (Ken)
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Karen,
The slop/flop of the main mirror in an SCT can certainly be improved by running the mirror up and down the baffle tube; by rotating the focusing knob (about 30 turns) each way a few times.
This re-spreads the grease on the baffle tube and reduces the effective gap.

A routine job which should be done by all SCT owners at regular intervals.
Hope that helps.
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Old 06-07-2018, 11:50 AM
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blink138 (Pat)
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Quote:
Originally Posted by Merlin66 View Post
Karen,
The slop/flop of the main mirror in an SCT can certainly be improved by running the mirror up and down the baffle tube; by rotating the focusing knob (about 30 turns) each way a few times.
This re-spreads the grease on the baffle tube and reduces the effective gap.

A routine job which should be done by all SCT owners at regular intervals.
Hope that helps.
that's good info ken!
pat
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Old 06-07-2018, 03:42 PM
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multiweb (Marc)
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Drilled the back cell on mine and I have three bolts going right through. I get to focus then touch the bolts to the glass and it holds the mirror in place on three points.
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Old 06-07-2018, 03:45 PM
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Merlin66 (Ken)
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Marc,
Yes, a possible solution for some capable members....
(Your link doesn't work for me?)
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Old 06-07-2018, 03:47 PM
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multiweb (Marc)
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Originally Posted by Merlin66 View Post
Marc,
Yes, a possible solution for some capable members....
(Your link doesn't work for me?)
Bummer... try this one.
http://www.astropic.net/astro/C11/ar...w&productid=18
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Old 06-07-2018, 03:58 PM
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Merlin66 (Ken)
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Hmmmm
Not a job for the faint hearted!!!
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Old 06-07-2018, 08:10 PM
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sungrazer (Karen)
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Quote:
Originally Posted by Merlin66 View Post
Karen,
The slop/flop of the main mirror in an SCT can certainly be improved by running the mirror up and down the baffle tube; by rotating the focusing knob (about 30 turns) each way a few times.
This re-spreads the grease on the baffle tube and reduces the effective gap.

A routine job which should be done by all SCT owners at regular intervals.
Hope that helps.
thanks Ken
Will give that a shot
cheers
Karen
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  #9  
Old 06-07-2018, 08:11 PM
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sungrazer (Karen)
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Originally Posted by multiweb View Post
Oh My..
Nice one
cheers
Karen
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