QUOTE(bdrc @ Dec 31 2019, 11:38 AM)
My A6000 runs fine in -10c at Nikko's winter and fully wet from Kyoto all-day drizzle during autumn without cover. Pretty sure A7m3 will do just fine, the higher capacity also hold more active charge against the cold.
Or just get a simple plastic/pouch for extra sure.
A6300 here. Try -30c for a few hours on the top of Mount Kiso-koma in Nagano (well, to be exact the Senjojiki Cirque a bit below the peak) doing star-trails and starfields, with moderate snowfall all the way to the shooting point (took a good 5 mins hike). Coverless of course.
Camera did fine no problemo and is still kicking just fine now (a year later). I... didn't fare so well (the cold was... well damn cold) lol so I didn't end up taking as much pics (as well) as I would have liked (even tho that clear weather at the end was pretty miraculous TBH).
That said, while the body usually does fine (even with snow), the condensation that forms INSIDE lens elements repeatedly when you go in and out of heated areas are more of a concern for non-weathersealed lenses. Trapped moisture are fungi magnets unfortunately... and in the short term they also fudge up your sharpness all to kingdom come while they're there.
Then again if you store your lenses well afterwards (and have oodles of dripaks/dissicants for your cam bags) you should be fine, considering how my SEL24 and Sigma 1.4/56 are still fungi free right up to now.
Similarly, make sure no snow gets into your bag... which you might find to be nigh impossible depending on how hard its falling down. Again, a whole bunch of dissicants (and spares) might help with the bits that did end up sneaking inside.
Of course if you're running weathersealed lenses you should be fine TBH.
This post has been edited by Eiraku: Jan 3 2020, 07:59 PM