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Old 12th March 2013, 10:11 AM
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luddite luddite is offline
I Love HFT
Join Date: Apr 2009
Location: Upper Buggersdale, Leeds
Posts: 642

Originally Posted by Delphinus View Post
I agree that the metal expand and contract, a simple solution will be a scope with a carbon fiber body.
Where I shoot we donít have subzero temperatures so I donít have your experience but how about a different approach?

Did any of you made tests to support that thesis?

My belief is that the biggest factor in the differences that I read here are related with light/contrast and not
temperature and they are related.

Rod and all others with March scopes buy a 55mm UW filter attach it to the scope and experience differences off 5 yards at 55yards.
I think you have something there.
I use transition lenses in my specs.

Since I started using them I have noticed the difference in summer and winter discrepancies in range finding is less so light intensity is most probably a factor.

Anyone who has dabbled in photography knows that brighter light requires a reduction in aperture causing an increase in depth of field.

The converse is also true, ie less light requires a larger aperture thus a decrease in depth of field.
Less is more.

More or less.

Last edited by luddite; 12th March 2013 at 10:24 AM.
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