Particularly relevant advice for cold weather
Q: When I travel to my stalking grounds in a warm car my scope’s lenses fog up in the cold weather. What, if anything, can I do to stop this? It’s a real nuisance and very irritating when I want to get out in the field
Bruce Potts offers some solutions
A: It can indeed be a real pain when you get to your shooting grounds after a long drive and then, when you remove the rifle from its case, the scope’s lenses fog over with condensation in the colder air.
If it is just the external surfaces that are fogging or showing signs of condensation, it is not too bad.
A bigger problem
It is when the internal of the scope fogs that you have a bigger problem on your hands. This means that the scope’s seals have failed and the inert gas used to purge the scope to keep it dry has escaped. This will require repair by the manufacturer.
The likely cause
However, it is more likely that the rifle is warm from the car and it is simply the change in temperature causing the problem. To prevent this, keep the rifle in the case but put it in the coldest part of the car — for example, the boot — and then when you arrive at the shoot bring it out and unzip it and let it acclimatise a while to the new temperature. Also open the scope’s flip-up covers if it has them.
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