Contact PlateAndFilm

PlateAndFilm is a small, independent, ad-supported site — there is no support desk standing by, but a real person reads everything that comes in to support@ambrotos.com.

A few things this address is genuinely useful for: a calculator that gave you a result you think is wrong (say which tool — the reciprocity & exposure calculator, ISO↔EV converter, print DPI & size calculator, dilution ratio calculator, collodion ratio calculator, or photo process identifier— and the values you entered); a tool or process you wish existed on the site; an out-of-date fact or unclear step in the journal, learn section, or the museum; or a bug in how a page looks or behaves on your device.

There’s no fixed response time to promise, and no ticket number or live chat — email is read and handled as it comes in. If your question is really “what is this plate in my hand worth?” or “is it safe to handle this chemical?”, a professional appraiser or a conservator will serve you far better than this site can: PlateAndFilm provides general-purpose identification tools and historical explanations, not appraisals, conservation services, or chemical-safety guidance.

Before writing in about a tool result, it’s worth double-checking the values you entered — a mismatched unit, a ratio typed backwards, or an estimated figure is the most common source of a surprising answer. If it still looks off after that, that’s exactly the kind of message worth sending.