The Sinar P is a 4x5 large-format monorail view camera from the Swiss manufacturer Sinar, positioned as a studio and architectural tool with full geared movements on both standards. It belongs to Sinar's professional precision system, designed around interchangeable bellows, format conversion kits and the company's modular rail system.

At UK auction today, Sinar P bodies have a wide hammer-price spread, with recorded results running from £210 up to £950 and a median around £700. These are wholesale saleroom results, and the spread reflects how heavily completeness drives value — a bare standard set sells for far less than a well-equipped outfit, so what a Sinar P is worth depends almost entirely on which bellows, rails, format backs and lens boards are included.