anamorphic lens guide — free browser tool | fatcousin

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squeeze ratio + sensor + focal length → captured vs anamorphic horizontal FOV, full-frame equivalent focals, bokeh shape, +diopter references, and aspect / gate notes for your delivery ratio

Horizontal scene angle matches a spherical lens of f ÷ squeeze on the same gate; vertical matches a spherical f. Full-gate desqueezed aspect is (width × squeeze) ÷ height. Diopter values are for front-of-lens +strength; always verify on your set.

squeeze + lens

squeeze (horizontal)

focal length (mm, nominal)lens MFD (m) · optional

sensor gate

format

Active: Super 35 (4-perf) · 24.89×18.66 mm

target delivery aspect (W:H)

field of view

vertical FOV (spherical f on gate)

21.1°

same for anamorph as for spherical at this f

horizontal FOV (spherical f, same f)

28.0°

captured: narrow, if this were a spherical lens at f

horizontal FOV (desqueezed / scene)

52.9°

displayed: matches f ÷ squeeze horizontally

horizontal spread vs spherical f

+25.0°

how much wider than a spherical of the same f

full-frame style equivalents (imaging)

spherical f for same horizontal FOV (same gate)

f ≈ 25.00 mm

f ÷ squeeze

FF eq. (horizontal, same scene angle)

34.8 mm

35mm stills gate ref

FF eq. (vertical, same f)

69.5 mm

vertical matches spherical f

bokeh (idealized)

desqueezed bokeh (idealized ellipse)

Horizontal : vertical axis ≈ 2.00 : 1 for a defocused point (no cat’s-eye).

OOF highlights often look horizontally elongated ~S:1 in the desqueezed image; true shape depends on aperture and anamorph pair.

diopters (front +, infinity lens model)

+0.3 D≈ 3.3 m

+0.5 D≈ 2.0 m

+1 D≈ 1.0 m

+2 D≈ 0.5 m

+3 D≈ 0.33 m

+D in front: subject distance ≈ 1 ÷ D metres. With anamorphics, focus through the pair, check astigmatism, and prefer matched diopters.

desqueezed aspect & your target

full gate desqueezed ≈ 2.67:1 — target 2.39:1

Full gate desqueezed ≈ 2.67:1 (wider than 2.39:1). Trim ~10.4% of image height (top/bottom) to get 2.39:1, or add letterboxing.

common delivery ratios vs your gate

2.39 scope (2.39:1) — Wider than 2.39 — ~10% H-trim.
2.00 flat (2:1) — Wider than 2 — ~25% H-trim.
1.90 near-DCI (1.9:1) — Wider than 1.9 — ~29% H-trim.
1.85 academy wide (1.85:1) — Wider than 1.85 — ~31% H-trim.

Sensor “modes” (open gate, 4:3 anamorphic, 17:9, etc.) change width × height — pick the mode whose full desqueezed width × squeeze ÷ height is at or just above your finish ratio so you can trim, not scale up.

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