Select and compare multiple lenses — visualize image circle coverage across sensor formats
Image circles quoted at infinity (typically at f/22, per the manufacturer's brochure), except macro lenses which are quoted at their design magnification (annotated in the lens name, e.g. @ 1:1 or @ 1:5).
Only lenses whose image circle covers the largest selected format are clickable — smaller lenses are dimmed out. Selecting a larger format (e.g. 4×5 or 8×10) prunes any active lenses that no longer cover it.
Hover a circle (or a selected lens's name) to preview its coverage. Click a circle — or the ⊙ button on a selected lens — to pin its info box; boxes close via their × button or the ⊙ button again.