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Old 25-06-2007, 10:39 PM
astro_nutt
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astro_nutt is offline
 
Join Date: Mar 2005
Location: Melbourne
Posts: 1,013
Welcome Timelord!!!
A bit of slack is necessary as the diffence in metal alloys that are used in the manufacture of optical components..eyepieces..barlows..pho tographic equipment..etc
All scopes will be exposed to some degree of thermal variances and you wouldn't want your eyepieces to get stuck in your focuser!!!
Cheers!
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