Film Resolution Calculator

Film format

Negative gate size

Film resolution

Line pairs per millimetre (lp/mm)

80 lp/mm

20 lp/mm — coarse / push-processed · 80 lp/mm — Velvia 50 / Ektar 100 typical · 140 lp/mm — tech pan theoretical max

Resolution

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horizontal

Megapixels

—

total

Pixels W

—

horizontal

Pixels H

—

vertical

Gate size

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mm × mm

Format comparison

Current format

35mm 4-perf reference

Lens image circle

Real-world 35mm measured data

Source	Film	lp/mm	Equiv.
Roger Cicala (Lensrentals)	Velvia 50 / Ektar 100	70–85	~20–25 MP
Tim Parkin / OnLandscape	Fuji Velvia 50	80–100 (centre)	22–28 MP
Ken Rockwell	Best 35mm colour	~80 avg	22–25 MP
Hamrick / VueScan	4000–5400 ppi scans	—	23–26 MP
Imacon / Flextight users	Velvia 50 drum-scanned	—	24–30 MP
Theoretical max	Tech Pan, Adox CMS 20	120–160	35–45 MP

20–25 MP is the most widely accepted real-world figure for a perfectly shot and scanned 35mm frame of Velvia 50 or Kodak Ektar 100 with a top-tier prime lens. Higher numbers are achievable only under ideal lab conditions with ultra-slow B&W technical films. Anamorphic formats display the squeezed gate — the projected image is stretched 2× horizontally at projection.