If this question bothers you as well, then you're certainly looking for a camera that can suit to your needs.
In 2008, when Panasonic launched the world's first mirrorless camera, the Lumix G1, nothing has been the same since then. Even though mirrorless cameras also allows you to change lenses like the DSLRs but they lack a complex internal mirror system. When compared to established DSLRs, the lenses of the mirrorless cameras aren't that powerful. Be it enthusiasts or pros, however have taken a bit of convincing on the merits of mirrorless cameras. With no mirror, there is no optical viewfinder and the camera depends on electronic viewfinders raising questions over the image quality, features.
Size and Weight:
DSLRs > Mirrorless
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While DSLRs can be big, bulky with a big telephoto lens, Mirrorless cameras are generally smaller and lighter and therefore easier to shoot.
But the smaller size doesn't always play out as because for full frame, APS-C sized sensors mirrorless cameras, you get a slim body but a fat and heavy lens on the front. Though some models now come with a retractable power zoom lens, but once you change the inbuilt lens, all the charm is gone.
But in case of few high-end mirrorless cameras, they are growing in size as they are feature-rich and manufacturers respond to feedback from photographers who want larger grips, but there are several entry-level DSLRs are facing difficulty to compete with smaller footprint of similarly priced CSCs.
DSLRs = Mirrorless (vast options, entirely depends on your needs)
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In case of DSLRs, Canon and Nikon have massive lenses for every purpose, but Mirrorless cameras of Olympus, Panasonic and Fujifilm have good and continuously evolving ranges. Though Sony haven't had any innovative ones, but is sure quick to innovate.
For a photographer looking for a variety of lenses, then a Canon, Nikon DSLR is the best choice. Both of them have a huge range of optics and an extensive range of lenses - all at an affordable range. And of course, there's always an excellent third party supporter providing the best of lenses like Sigma and Tamron.
While Canon and Nikon have had more than decades to invent and improvise their lenses, the first lens mount launching in 1959. But mirrorless camera had only happened in 10 years ago. Thanks to brands like Olympus, Panasonic the same Micro Four Thirds lens mount and have been the longest and the most comprehensive offering a huge range of optics - from ultra wide-angle zooms to fast prime telephoto lenses.
DSLRs < Mirrorless Cameras
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Many DSLRs have photographers would still prefer an 'optical' view for its clarity, natural look and lag-free viewing, and others prefer to see a digital rendition of the scene as the camera would capture it.
The DSLRs are the cheapest and come with an optical viewfinders since it is an integral part of the DSLR design, ignoring the fact that there are a few entry-level DSLRs that doesn't have any viewfinders.
Mirrorless cameras on the other hands, are expensive with viewfinders and are electronic in nature than optical ones. The electronics viewfinders have issues that can range from having pixelation and lag in the camera image. But like everything else, the advantage of electronic viewfinders is that a lot of information can be displayed on the screen like live image histograms, digital image simulation, low-light image capturing.
It is to note that there are some high-end mirrorless cameras that offer high magnification, large resolution viewfinder making it a stand-alone product in the market.
DSLRs << Mirrorless
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DSLRs have been known to be a clear winner in terms of auto-focus, but tEven though mirrorless cameras also allows you to change lenses like the DSLRs but they lack a complex internal mirror systemhey're good in tracking fast subjects but loose points in Live Video. On the other hand, Mirrorless cameras are good when used with LCD screens, having excellent overall Auto-Focus performance even when using EVF.
DSLRs like Nikon D850 is one of the flagship in DSLR cameras that allow a sophisticated system in the working of the camera - but all of this happen when the mirror is down. But when you start using the same DSLR in a live view mode, the mirror needs to be flipped ip and the regular Auto-Focus is no longer in the light path. With a switch to slower contrast Auto-Focus using the image being captured by the sensor. However, in the recent DSLRs like Canon EOS 800D, 80D, 5D Mark IV - having the Canon signature Dual Pixel CMOS AF using phase-detection pixels built into the sensor.
Mirrorless are the clear winner in this aspect they have to use sensor-based autofocus everytime and most of them rely on contrast based Auto-Focus and are faster than DSLRs. Advanced mirrorless cameras have 'hybrid' Auto-Focus systems that merge autofocus with phase-detection pixels on the sensor with the likes of the Fujifilm X-T2. Panasonic Lumix G9 are really overwhelming with their speed, accuracy and their subject-lock technique that makes it a flagship killer feature of all mirrorless cameras.
DSLRs << Mirrorless
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Just like AutoFocus, even the best DSLRs can't match up to the speeds of Mirrorless cameras since these cameras add to a high-speed shooting. If you require a fast continuous shooting mode to record some coolest action shots then mirrorless cameras will do the trick with their mirrorless system that have mostly stable parts and providing 4K video recording and requires serious processing power and helps continuous shooting as well.
Canon's top selling DSLR, EOS-1D X Mark II can shoot at 14 fps but the mirrorless Panasonic Lumix G9 can shoot at a pathbreaking speed of 20fps. But, not everything comes easy. While choosing the correct mirrorless camera, you need to keep safe from cameras that boast of a large fps (up to 60fps) and would have to use an electronic shutter to achieve the same and the focus would be fixed from the first shot. Also be realistic in the type of burst shooting speeds that you need, be it at 60fps that would need filling up of the card quickly while spending a lot of time skimming through a huge number of images to find that 'great' shot. Overall, it can be said that though DSLRs have had a legacy of cameras that have produced some extraordinary images, but the breakthrough innovation of mirrorless cameras have opened up a whole new demographic in photography.