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Erik D
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Reged: 04/28/03
Posts: 3724
Loc: Central New Jersey, USA
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Re: temperature affect on focus
11/07/09 09:12 AM
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The GO SS 22X85 is of aluminium construction, close to 16 inch(~406 mm) in length.
40 deg F delta = 22.2 deg C.
Coefficient of linear thermal expansion for Al is ~23/1,000,000 per deg C
A 40 F/22.2 C temp drop would result in ~ O.2 mm contraction of binocular housing.
Dimensional displacement of the objective spacing, prisms and eye pieces are additional factors to consider.
Coefficient linear thermal expansion for steel is approximate 1/2 of aluminium.
ERik D
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