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This may be a dumb question. Going to Alaska in couple weeks hoping for Aurora photography. Have been fine tuning focus and marking lens barrel at infinity focus so I do not have to worry about it in the dark. One of the lenses used is a samyang 35/1.4, there is a 1 mm difference between perfect focus and mush. I am using a first gen 5D without live focus. Does anyone know if the 50-80 degree temperature difference between here and there is likely to cause any changes to lens and therefore focus? I may not have the ability...Show more →
Very interesting question!
One of my interest is trying to take picture of the nightsky and moon, and from different tries and experiments, I have concluded that it helps to "temperate" the equipment before I start... so I leave the camera and lens outside in the cold for an hour or so before I start to photograph. So to answer your question, yes I do believe the focus will change with "extreme" temperature changes...
If I were you, and I hope this doesn't sound dumb, I would have taken out the battery, pre-focused your lens and dumped your equipment in the freezer for a good while... quickly take it out, put it on a tripod, take some pictures, take out the memory card, put the whole stuff back in the freezer, analyze the pictures, and try again if necessary... the equipment is safe in the cold... living in Norway I have never had a problem, just be careful bringing your stuff back in... heat it up again sloooowly.. in a plastic bag many recommend... or normally I just leave it overnight in my camerabags... never had a problem...
Good luck in Alaska! I would love to go one day too!