Tools
Small calculators that turn the optics in the lessons into numbers you can act on. Each one works one-handed and remembers nothing — just dial and read.
Depth-of-field calculator
Near, far, total depth, and the hyperfocal distance for either lens at any focal length, aperture, and subject distance.
Field-of-view comparator
See what 10, 17, 35, and 70mm each frame of the same scene, with the full-frame equivalent and how far each lens reaches.
180° rule + ND helper
The right shutter for your frame rate, and exactly how many stops of ND to hold it in bright light.
Pocket cards
Four print-ready reference cards: exposure, the recommended setup, video, and a hyperfocal table for both lenses.