Reciprocity Plus is a photo tool designed for digital and analog photography to calculate long exposure. If you are tired of mentally multiplying the exposure time with your ND3+ND8 filters and adding the reciprocity failure rate, then Reciprocity Plus is the perfect solution for you. It offers 29 filters, including CTO, CTB, Green series, ND series, and more. Additionally, it includes 110 reciprocity charts, and you can design or modify existing charts. You can also share your charts with the Pinhole Assist App and via email.

Reciprocity Plus provides a wide range of available charts, including a chart adapted from Jim Shull's The Hole Thing, two charts for RC photo paper, 400TX, TMX, TMY, HP5+100 Delta, and Ilford films from the APUG forums. It also includes max 400, T max 100, TRiX & Plus 125, Ilford films from the Without Lenses website, official Ilford films, Ektachrome, Fujichrome, Agfachrome, and more from "Using the View Camera." Moreover, it features a timer that notifies you when the exposure is over, even if you quit the app.