I'll point out that the vast majority of what you will ever spend on a film photography business will be on consumables, which you will buy new. But you can't depreciate those. Expenditures on equipment will be a rounding error. You aren't going to need to go back a year later and buy another camera, so year-to-year comparisons are meaningless. Film holders, sure, you always may need more. Write them off as a consumable. Ditto ground glass backs (they break), bellows (they get holes), shutters go bad and need to be swapped out, and so on. The vast majority of LF equipment can be broken down into parts, most of which are either incredibly durable, new manufacturer (e.g. tripods), or potentially consumable. Get a annual lump sum for consumables, and buy your used film holders, etc out of that. But the math doesn't work on depreciation.
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