By lens

Lens focal lengths

Focal length is the other half of every range figure on this site. A longer lens narrows the view and stretches every Johnson range in proportion; it also gets heavier and dearer fast, because thermal lenses are germanium. Grouping by lens shows how much of a unit's reach is the glass rather than the core.

9.1 mm lens

2 units · est. detection 190 m–190 m

19 mm lens

6 units · est. detection 279 m–396 m

25 mm lens

7 units · est. detection 521 m–521 m

35 mm lens

27 units · est. detection 515 m–729 m

42 mm lens

3 units · est. detection 875 m–875 m

50 mm lens

18 units · est. detection 735 m–1,250 m

60 mm lens

2 units · est. detection 1,250 m–1,250 m

Only groups with two or more units get a page — one unit is not a comparison.