Trying to figure out how to use a red filter

Here’s a few decent photos from my third ever roll of 120 film. I was practicing with the Mamiya 645 1000s and the MeFOTO RoadTrip tripod while also testing out the effects of a red filter, with and without a circular polarizer. Oddly the red filter didn’t darken the sky nearly as much as I thought. Could be due to overexposing my too many stops perhaps? It worked well for the denim birdhouse but overall not the crazy dark skies I was hoping for. In the previous role, there seemed to be some light leaks, so for this roll I taped the film back of the Mamiya along the top, bottom, and sides. Definitely helped although there were some small leaks outside the frames still. Looks like I’ll need to get new foam inserts either way though.

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