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Old 22nd July 2016, 12:03 PM
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NeilM NeilM is offline
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Join Date: Mar 2015
Member of: Avon Hawks
Location: Nth Somerset
Posts: 508

Heat, or rather expansion of different metals will have an effect on both scope and rifle, sometimes measurable, sometimes not.

My old Leupold 20-50 did not seem to budge regardless of hot or cold, where as my EFR becomes totally useless as a rangefinder when hot.

I'm sure light also has an effect and have experienced it sometimes, but as I almost never rangefind on the target face it is not as noticeable as the temperature effect on my scopes.
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