Comparing Sensor Formats Side by Side

The same lens behaves differently depending on the sensor behind it. A 35mm lens on full frame gives a completely different field of view than the same 35mm lens on Micro Four Thirds. This tool puts two sensor formats side by side at a shared focal length so you can see exactly how crop factor, field of view, and 35mm-equivalent focal length shift between them, live as you switch sensors.

Why Sensor Size Changes Your Framing

A lens projects a fixed image circle regardless of what sensor sits behind it. A smaller sensor captures a narrower slice of that circle, which crops into the frame and narrows the field of view — visually similar to using a longer lens. That’s why a “50mm” lens feels noticeably tighter on an APS-C body than on full frame, even though the physical focal length hasn’t changed.

Reading the 35mm Equivalent

The 35mm equivalent focal length answers a practical question: what focal length on a full-frame sensor would produce the same field of view as your entered focal length on this sensor? It’s the standard way lenses and framing get compared across formats, and it’s what most crop-factor conversions are built around.

This tool is especially useful for:

• Filmmakers and photographers comparing how a lens kit will behave across different camera bodies.
• Buyers evaluating a format switch who want to know how their existing glass will reframe on a new sensor.
• Multi-camera productions matching field of view across mixed sensor sizes.