How do i claim my photography equipment as expenses for my photography business? The business was started in March of 2016.

I started my business in March of 2016, at the time i upgraded my equipment and purchased a few additional things such as lenses, filters, batteries, memory cards, etc that i needed throughout the year. Can i claim those as Startup cost even if they occurred a few months after the business was started? Or is there a different way to claim them?