The Rollei P3801 is a dual-lens slide projector designed for projecting 35mm transparencies, with two lenses allowing dissolve-style transitions between successive slides. It sits within Rollei's projection equipment line rather than its camera range, and was sold as a presentation tool for amateur and semi-professional slide shows.

Sales data for the P3801 is very thin: a single UK auction hammer result from March 2023 saw an example sell for £62, which is the only verifiable wholesale reference point available today. With just one record, it is not possible to define a meaningful price range or median, so anyone wanting to know what a P3801 is worth in 2026 should treat that £62 figure as indicative rather than definitive and watch further saleroom appearances before pricing.