Interactive Lens Focal Length, Room Distance & Bokeh Simulator
Before buying a lens for a small bedroom studio, barbershop chair, tattoo booth, or wildlife trip, check whether you actually have enough physical room to step back—and how much of the subject stays in sharp focus at your chosen aperture.
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1-Click Real-World Use-Case Presets:
Lens Focal Length: 50mmFull-Frame Equiv: 50mm
12mm (Ultra-Wide)35mm50mm85mm200mm400mm
Lens Aperture: f/1.8DOF Equiv: f/1.8
f/1.2 (Max Bokeh)f/2.8f/5.6f/8f/16 (Deep Focus)
Camera-to-Subject Distance: 1.8 m (5.9 ft)
0.4m (Macro/Arm)1.5m (Booth/Desk)3m (Studio)10m+ (Field)
Live Optical SimulationWaist-Up / Desk Creator Frame
35mm Equiv. View50mm (46.8° AOV)
Sharp Depth of Field13.6 cm
Frame Coverage at 1.8m1.3m × 0.86m
Bokeh / Background Blur
54/100
Barbershop / Makeup Chair Tip: 35mm on APS-C (52mm equiv.) at 1.6m fits tight salon stations while blurring background mirrors.
How Sensor Size, Focal Length, and Room Distance Work Together
Two numbers determine whether a lens fits your workspace: the full-frame equivalent focal length (focal length multiplied by your sensor's crop factor) and your camera-to-subject working distance.
| Use Case | Typical Available Space | Recommended Full-Frame Lens | Recommended APS-C Lens (1.5x) |
|---|---|---|---|
| Handheld Vlogging / Walking | 0.5m – 0.8m (arm's length) | 16mm – 20mm f/1.8–2.8 | 10mm – 12mm f/1.8–2.8 |
| Desk YouTube / ASMR / Guitar | 0.8m – 1.4m (across desk) | 24mm – 35mm f/1.8 | 16mm – 23mm f/1.4 |
| Tattoo / Product / Food Close-Up | 0.4m – 1.5m | 50mm f/1.8 or 90mm f/2.8 Macro | 35mm f/1.8 or 60mm f/2.8 Macro |
| Barbershop / Makeup / Headshots | 1.5m – 2.5m | 50mm – 85mm f/1.8 | 35mm – 56mm f/1.4 |
| Wildlife & Birds in Flight | 10m – 60m+ | 150–600mm / 180–600mm | 100–400mm (600mm equiv.) |