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Tight Knobs !! OOooo dear me

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#1 LeeRich

LeeRich

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Posted 01 April 2005 - 12:58 PM

Hi, just fitted some Bobs Knobs style knobs to my LX90 and i noticed that when its in semi correct collimation (by that i mean the 5' stand back and weigh it up test) 2 of the knobs are at the end of their travel, and i have to tighten them quite tight to achive concentric rings.

What is yours like when collimated ? are they all free to rotate or is it normal to have a tight 1 or 2 ?

Any help is much appreciated,

Cheers,

Lee.

#2 Starman1

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Posted 01 April 2005 - 01:52 PM

Lee,
When I installed them on my LX200, they all engaged about the same, and all were about the same tension.
I used the daylight collimation method here to collimate by eye.
It came out close enough only a minor tweak was necessary at night.
You should be able to achieve near-collimation with the screws all about equal tension.
If they are not, it could be a sign the corrector plate isn't sitting level, or worse, that the secondary cell is loose and tilted significantly relative to the primary.
I sugest loosening the screws until none is tight, then gradually tightening each until snugness "JUST" starts, then evaluating concentricity (as in the link above) and adjusting.
I suspect very little extra tightness will get you set up.

"If at first you don't succeed........."


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