Unless you have through-the-lens metering on your LF camera,
you can use a linear polarizer. You can often find them used and cheaper than circular polarizers. Get a good-quality coated one for best results. B+W, Heliopan, and Hoya coated filters are all good. Get a filter for the largest lens you plan on using and step-up your others to fit; then you can use one filter for all of them.
Reducing all reflections isn't always the best solution, as mentioned above. If outdoors, overcast days are often your friend.
Best,
Doremus
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