![]() ![]() We used a Canon 7D or 1D Mark IV for all the subway scenes I could just carry a 7D and shoot on the subway all day with a very small crew. If both sensors are receiving the same amount of total light, then the argument for smaller sensors being worse at low light is “quantum efficiency” - smaller pixels are noisier than larger pixels. Smaller sensor + same entrance pupil = same total light, but like taking a magnifying glass and using it to start a fire, the smaller the area, the more intensity, therefore the lower your ISO needs to be. There is the same amount of total light hitting the sensor in both cases (same entrance pupil), but it’s concentrated onto a smaller area, which is why you must decrease your ISO to get the same exposure - ISO doesn’t care how big your sensor is, it cares how intense the light is. To get the equivalent depth of field, you similarly divide aperture by 2.Ī 50mm f/4 lens on full frame has an entrance pupil of 12.5mm. ![]() N = f/D.Ī 50mm lens on full frame is 25mm on Micro Four Thirds. The f-number (or f stop) is defined as focal length / the diameter of the entrance pupil. Equivalent Depth of Field equals Equivalent Light Hitting the Sensor The inverse square law is captured neatly in the f-stop calculation. This 4x difference in light intensity is why a full frame camera needs +2 stops more ISO for the same image relative to a Micro Four Thirds camera. We can think of sensor size in the same way. By the time it’s traveled twice as far, it’s at 1/4 the intensity because it has to cover 4x the surface area. The Inverse Square Law describes how light travels away from a point. Many crop sensor cameras have a base ISO of 200. ![]() They have “deeper wells” allowing them to gather more light before saturating.Ĭrop sensor cameras have smaller photosite wells - they can’t gather as many photons before they saturate. Most full frame cameras have a base ISO of 100. Nikon has a full frame camera with a true base ISO of 64. Having a lower base ISO makes them better for bright light situations. Having larger photosites allows the camera to operate at a lower base ISO. When do you need to gather more photons? During the day when there are more photons to gather. The larger photosites of Full Frame cameras allows them to gather more photons. A controversial statement I know - let’s examine this in detail. Crop sensor cameras tend to prefer low light. Full Frame cameras are better in daylight. If you want to shoot in low light, full frame cameras are better than crop sensor cameras.” The convention wisdom says “Any camera can get the photo in daylight. Kristen, taken with the APS-C Ricoh GR The Convention Wisdom is Wrong ![]()
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