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1

If it happens when you switch it on, it's almost certainly not cooling - none of the activity you mention will have happened, and the camera components will be cooler than they would be during extended operation. If it only happens when you switch it on, the idea of a sensor cleaning system becomes likely. If it also happens while composing a shot (and ...


1

I have similar noises in my Canon EOS RP. Firstly, when I turn the device off or change a lens, there's a ~2 second fan-like noise. It's the ultrasonic sensor cleaning apparatus. It's entirely possible your camera uses the sensor cleaner when turned on and not when turned off. I like more the cleaning cycle when turned off because you won't be needing the ...


0

English language is particularly confusing regarding optical assemblies, especially in the context of photography... "Lens" indeed refers to the whole group of lenses (interchangeable or not) attached to the camera ... in microscopy and astronomy, this would be more formally called an "objective" (describing the sum of glass parts that AREN'T part of the ...


3

The camera lens is a converging lens. Light rays from the vista being imaged traverse the lens. Their path is altered by the density of lens material and by the shape of the lens. This action is called refraction (to bend back). To mitigate lens defects (aberrations), the modern camera lens is constructed using several lens elements, some convex, some ...


10

Just a guess, but I don't believe that ND filters are so widely used as you assume. A very large share of the users of a specific camera will never need an ND filter and therefore not be interested in paying whatever extra it will cost to include the filter in the camera. To make sense, an embedded ND filter would also have to be variable, otherwise it ...


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