The **throw ratio** for the **NEBULA Cosmos 4K SE

General
1

The throw ratio for the NEBULA Cosmos 4K SE is 1.2:1. This is a fixed value (no zoom), meaning the projector is a standard-throw model.

What the Throw Ratio Means

Throw ratio = projection distance ÷ image width
(both in the same units, e.g., feet or meters)

For this projector:
Distance (from lens to screen) = 1.2 × Image Width

  • It’s measured from the projector’s lens (usually near the front) to the screen surface.
  • This assumes a 16:9 aspect ratio image (the projector’s native aspect ratio).
  • Image height = Image width × (9/16) ≈ Image width × 0.5625
  • Diagonal (inches) = √(width² + height²) × 12 (converting ft to inches if needed)

Step-by-Step Math Examples

  1. Your previous example: 4 ft height × 6 ft width image

    • Width = 6 ft
    • Distance = 1.2 × 6 = 7.2 ft (≈ 2.19 meters)
    • Diagonal check: √(6² + 4²) = √(36 + 16) = √52 ≈ 7.21 ft → ×12 = ≈86.5 inches diagonal
      (This matches typical charts: around 86-90" diagonal requires roughly 7.2-7.9 ft.)

  2. Common reference: 100-inch diagonal (16:9)

    • For 16:9, width ≈ diagonal × (16 / √(337)) ≈ diagonal × 0.8716 (in same units)
    • 100-inch diagonal → width ≈ 100 × 0.8716 ≈ 87.16 inches ≈ 7.26 ft
    • Distance = 1.2 × 7.26 ≈ 8.72 ft (≈ 2.66 meters)
      (This aligns with official and calculator data for 100".)

  3. General formula to find distance from desired diagonal (inches, 16:9)

    • Width (inches) = diagonal × (16 / √(16² + 9²)) = diagonal × (16 / √337) ≈ diagonal × 0.8716
    • Width (feet) = width (inches) / 12
    • Distance (feet) = 1.2 × width (feet)
    • Or shortcut: Distance (ft) ≈ (diagonal inches × 0.8716 × 1.2) / 12 ≈ diagonal inches × 0.08716

  4. To find image width from a known distance

    • Width (ft) = Distance (ft) / 1.2
    • Example: If you place it 10 ft away → Width ≈ 10 / 1.2 ≈ 8.33 ft wide
      → Height ≈ 8.33 × 0.5625 ≈ 4.69 ft
      → Diagonal ≈ √(8.33² + 4.69²) × 12 ≈ 95 inches

Quick Reference Table (Calculated from 1.2:1 Throw Ratio, 16:9)

Diagonal (inches) Width (ft) Height (ft) Throw Distance (ft) Throw Distance (m)
60" ≈4.36 ≈2.45 ≈5.23 ≈1.59
80" ≈5.81 ≈3.27 ≈6.97 ≈2.12
90" ≈6.54 ≈3.68 ≈7.85 ≈2.39
100" ≈7.26 ≈4.09 ≈8.72 ≈2.66
120" ≈8.72 ≈4.90 ≈10.46 ≈3.19
150" ≈10.90 ≈6.13 ≈13.08 ≈3.99
200" ≈14.53 ≈8.17 ≈17.44 ≈5.31

These are precise calculations using the 1.2:1 ratio and match the projector’s official range (60–200" from ~5.2–17.4 ft). Minor variations (± a few inches) can occur due to lens offset (100% here, meaning the bottom of the image aligns with the lens level) or exact measurement from lens vs. front of unit, but 1.2 × width is the core math.

To get any size you want: Measure your available room depth → divide by 1.2 → that’s your max width → scale height for 16:9. Or start with desired width → multiply by 1.2 for needed distance. Super straightforward once you lock in the ratio!