Shallow depth of field f stop8/17/2023 It is valid if you are interested in how f/2.8 looks on different formats. why not compare dof of various sensor sizes at the same f2.8 for available light on the subject at the same distance from subject and vary the focal length to give equivalent field of view? Why is that not a valid way to compare. If you don't care about keeping such things the same, sure, go ahead and compare that way.īut if you need f2.8 for the available lighting. If you change the subject distance to make DOF the same, then field of view and perspective will no longer be the same. If you compare two different formats using the same f/2.8 at the same distance and the same field of view, DOF will no longer be the same. Why not compare dof of various sensor sizes at the same f2.8 for available light on the subject at the same distance from subject and vary the focal length to give equivalent field of view? Why is that not a valid way to compare. You can use a larger sensor camera at the same shutter speed to get those same results by using the equivalent focal length, a smaller aperture, and a higher ISO.Įither photo will come out essentially the same. If you 'need' f/2.8 for the lighting, that presumes you 'need' it in order to get the DOF you 'need' at a particular shutter speed you 'need' and an ISO that will deliver decent noise results. Short of engineering a sensor with higher efficiency, the only way to improve IQ under these constraints is to do what iPhone does - image stacking.īut if you need f2.8 for the available lighting. In all cases the sensor will receive about the same total amount of light and the IQ will be about the same. If you require a certain depth of field, on different formats the shots will have to be done using equivalent focal lengths, equivalent ISOs and equivalent f-stops. A small sensor does not offer any depth of field advantage. It appears that way because iPhone takes a bunch of images and stacks them. It may not even make for a good shot, regardless of what camera you use. If the table is so long that people at the back will appear very small, they do not need to be critically in focus compared to people closer to the camera. ![]() While I prefer crop cameras to full frame, your scenario actually requires using the best lens and lens placement for the job. At 2.8 only the first row of people is in focus, at f11 your iso is unacceptable and it appears that your iPhone takes better photos as there's no depth of field.īasically a situation where people are at different distance from the camera and all need to be in focus while the light conditions do not allow you to freely change your aperture.ĭoes any of you who own a full frame camera carry another pro camera with smaller sensor just to tackle situations like that? And then you need to take a photo lets say of a board room with long table and people around it in low light(forget the flash). Most of us want the best equipment and lenses with widest apertures.
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