Hi all, I am back to pick your collective big brains again with a few questions. I am taking a workshop on winter waterfalls. As more of a street person, I am not intimately familiar with landscapes. I have a tripod, and will be picking up tripod spikes. I am planning on purchasing a couple of ND filters. I thought about variable, but I've heard that their quality can be kinda wonky. I thought about getting a couple solid filters, likely a 3 stop and 6 stop. Also, for filters, I was planning on buying 77mm filters then using a step-up ring so that I could use the filters with all my lenses. Question 1: what should I look for with ND filters? Are variable filters ok, or should I avoid? Any brands in particular? Are 3 and 6 stop ok, do I need more, less? I'm trying to keep costs to a minimum (as always). Any issues (aside from it being annoying, ugh) with buying a larger filter and using a step-up ring? I'm not planning on renting any equipment, and since we'll be hiking several miles through snow with lots of clothes on, I'd like to only take the essential lenses. I have the following, all Oly: 12-40 f/2.8 14-150 f/variable 30 f/3.5 macro 17 f/1.8 45 f/1.8 75 f/1.8 Question 2: which lenses would be acceptable for landscapes? I'm assuming the 12-40 would be the best bet? Any specific reason to take any others? I was thinking of taking the 17 or 45, as well? We'll be out in the cold all day walking around. I have three batteries. Question 3: How is battery life in constant cold weather? Should I take any precautions, like use a hand warmer to keep the batteries warm and/or in my coat close to my body? Will three batteries be enough? Any other general advice to questions that I'm not asking because I don't know enough to ask them? Very much appreciate any advice you can provide. Thank you!