Redmoon Converters Calculate equivalent exposures across aperture, shutter speed and ISO. Each click is exactly one stop, with fractional stop support and EV table output.
| If you change… | To match exposure, adjust… |
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Each "stop" is a doubling or halving of light. Doubling ISO, opening the aperture by one stop, or doubling shutter time all add one stop. Equivalent exposures keep ISO_stops + aperture_stops + shutter_stops constant.
EV at ISO 100 = log₂(N² / t), where N = aperture and t = shutter in seconds. We adjust by 1/3 stops to match camera dial increments.
Crop Factor & Equivalent Focal Length Calculator
Convert focal length and aperture between sensor sizes — Full Frame, APS-C, M43, 1" and medium format.
Hyperfocal Distance & Depth of Field Calculator
Calculate hyperfocal distance and near/far DOF limits for any focal length, aperture and sensor size.
Video Bitrate & File Size Calculator (H.264, H.265, AV1)
Calculate video file size from bitrate, resolution, FPS and duration for H.264, H.265, AV1 and ProRes.