What we call 'T-stop' is a measure of how much light is actually allowed to pass through the lens. The f-ratio does not take into account how much of the light passing through the lens is lost due to reflection and/or absorbtion. This is very useful for calculating/predicting the effect of a specific aperture setting on depth of field. The f-number is an expression of the ratio between the diameter of the entrance pupil and the focal length. One could post process the raw data collected by either camera and get a final result very, very close to the what you got with the other camera above.Īnother possible source of the difference is that even though both lenses are set at f/4, one may have a higher transmissivity than the other. In the case of your Canon 400D, the differences between using the "Standard" (slightly oversaturated and slightly too contrasty) Picture style with 'Auto Lighting Optimizer' turned on compared to using the "Neutral" Picture Style with 'ALO' turned off will almost certainly result in greater differences than those seen in your example images comparing your result with the 400D vs. Depending on the contents of a scene and the nature of the light illuminating it, just changing the color temperature/WB of the same raw file can affect the resulting brightness of an image. The way each camera calculates automatic white balance, automatic contrast adjustment, saturation, etc. target aperture values and shutter times. To a usually much lesser extent, so can actual vs.
#Fuji devo dark noise iso
Actual vs, rated ISO settings can vary significantly from one model to the next.
Each sensor has its own sensitivity curves.
The different ways each camera is capturing and processing the light to which it is exposed.Clouds moving across the sky, for instance, can significantly influence both the brightness and the color of sunlight coming through a window. The light coming in your window could be variable if the atmospheric conditions at your location are changing between the two shots.There are at least two likely sources that are contributing to the variation you see.
#Fuji devo dark noise manual
If it matters enough to you to do such testing, an EF-FX adapter will allow you to use Canon lenses on the FujiFilm body. You'll have to focus manually and use a hack to set the aperture. STM lenses and some USM lenses won't be able to focus. You could also use manual lenses with adapters for both EF and FX mounts. Options include Nikon F, Pentax K, and M42.ĭifferences in lighting. You took the test shot after noticing the ISO difference between the cameras. It's unlikely that lighting just happened to decrease every time you used the FujiFilm camera, but not the Canon camera.Īuto Lighting Optimizer (ALO). ALO works by reducing image contrast. A similar effect can be achieved on a FujiFilm X-Series camera by adjusting highlights and shadows settings. Your Canon test image does not look like an ALO-adjusted image. It does look like exposure was increased. I don't have the Canon body anymore, so cannot test using the brighter lens on Canon vs the darker one on FujiFilm. But I'd expect a 1.3-stop difference. To determine the specific contributions of various factors to the results you're seeing, you'll have to further test your equipment. Lenses can transmit different amounts of light, despite using the same aperture setting. Here are two images taken with different lenses using the same camera body and settings. Again, there is about a 2/3-stop difference. Here are some test images taken on Canon and FujiFilm bodies with the same lens and exposure settings. I estimate about a 2/3-stop difference. The difference you are seeing is likely caused by a combination of effects from using different bodies and lenses. To compare lenses, use the same camera body. To compare camera bodies, use the same lens.Ĭanon and FujiFilm cameras do produce images with slightly different exposures at the same settings. According to the Wikipedia article on Film Speed, camera manufacturers can choose from "five different techniques for determining the exposure index rating at each sensitivity setting". FujiFilm is reported to use the SOS method. Canon apparently uses the REI method.
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