Hello, first of all, let’s analyze and understand the things you mentioned.

Let’s talk about SLR first. SLR, literally, means a single-lens reflex camera. The lens can be detached and replaced with lenses of different focal lengths and apertures to achieve different effects.

As for Polaroid, the literal meaning is that you can get the photo immediately after taking it, and the photo can be taken out after pressing the shutter. You cannot regret or delete it. In other words, no matter whether you are satisfied with the photo or not, it is yours.

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As for mirrorless cameras, we can understand them as micro SLRs. In fact, mirrorless cameras are a crossover between ordinary card cameras and SLRs. They combine the advantages of interchangeable lenses of SLRs with the advantages of light and compact card cameras, so they are now widely loved.

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As for digital cameras, this category is quite large, including the SLRs and mirrorless cameras you just mentioned, which are all classified as digital cameras. Of course, I can understand here. Maybe you are talking about ordinary small cameras.

We become card machines.

What are the differences between these types of cameras? First of all, among these types of cameras, the one with the best image quality and effect is undoubtedly the SLR, because the CMOS/CCD (you can understand it as the photosensitive element) in the SLR camera

It is much larger than mirrorless cameras and card cameras, and the advantage of having a much larger photosensitive element is that it can accept more light from the outside world, get better results, and bring more ideal picture quality, so this is what the previous Nokia mobile phones had

The reason why 41-megapixel mobile phones are still beaten by Nikon's 12-megapixel D90 is because the photosensitive element of a SLR camera is many times larger than that of an ordinary digital camera, let alone a mobile phone.

Secondly, the photosensitive element of a mirrorless camera is only a little smaller than that of a SLR. I would say that a mirrorless camera is better than a SLR.