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Old 11th March 2013, 07:31 PM
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Originally Posted by DeanB View Post
In relation to other comments - I reckon it is the change in dimensions inside the snail shape that leads to the change in ranging.
How does this explain the phenomenon that temp shift appeared only after moving the wheel? If the plate with the snail groove contracts then it can simply move the lenses with itself. I think that it is the opposite thing, i.e. the lenses want to move but they can not rotate the wheel so they build up only some tension against the snail groove and when the wheel is rotated then they release and need another wheel position to show sharp picture again.
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