Glass Bodies, a Census of Lens Variants

Field notes

Glass Bodies organizes its material by lens family rather than by broad camera brand, allowing closely related variants to be compared in one place. Entries record mounts, dates, focal lengths, apertures, optical formulas, and variant counts; some go as far as naming element-and-group arrangements. The homepage reports 46 families in its S-mount census and three additional families outside that census, while a rotating “Today's gem” provides a serendipitous way into the catalog.