Here is how mirrorless cameras works?
While the DSLR uses a mirror mechanism to reflect light into the optical viewfinder or transmit it directly to the camera sensor, the mirrorless camera does not have the mirror mechanism (hence the name), which means that light always passes through the lens on the image sensor.
How to protect your mirrorless camera
Although mirrorless cameras are generally well-built devices, they are still electronic devices that have glass components, among other things.
How to clean the mirrorless camera
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