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    Home»Camera Tech»DSLR vs Mirrorless cameras.
    Camera Tech

    DSLR vs Mirrorless cameras.

    ShawnBy ShawnFebruary 5, 2023Updated:February 5, 2023No Comments7 Mins Read
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    Mirrorless cameras have stormed the market, but are they the professional’s choice for photography? Read on to find out!

    The main difference between a DSLR interchangeable lens camera and a mirrorless interchangeable camera is that DSLR’s have a mirror inside them and mirrorless cameras don’t. In a DSLR the mirror reflects the image from the lens into a prism that flips it around so it looks correct when looking through the optical viewfinder.

    The biggest drawback of DSLR’s is that the mirror has to move out of the way each time the shutter button is pressed. And since the mirror has to be moved using a flipping motion there needs to be space inside the camera for the mirror to move around. This space is commonly referred to as the “mirror box”. The addition of the space increases the back-focus distance of the lens used on a DSLR. This is why if you have used a DSLR lens on a mirrorless camera the adapter adds like an inch of space between the actual camera mount and the lens mount.

    In a DSLR the mirror is also integral to the function of the phase detection autofocus system. Behind the main mirror there is another smaller mirror which sends light to the autofocus sensor. In any DSLR with autofocus the main mirror is actually semi transparent, sort of like a mirrored window pane as opposed to a true mirror like what you would have in your bathroom. The light that is allowed through the main mirror is used for autofocusing and metering in a DSLR.

    Below is an image showing the inside of a DSLR camera:

    Inside of DSLR camera.

    In a mirrorless camera there is no mirror at all so autofocus is handled differently. With a mirrorless camera the lens image is always hitting the primary imaging sensor. Since there is no secondary sensor for AF and metering, all those functions are handled by the primary sensor in a mirrorless camera.

    Below is an image showing the inside of a mirrorless camera.

    Inside of mirrorless camera. Red arrow indicates back focus distance.

    In DSLRs that have AF the type of AF is known as phase detection AF. This type of AF allows the camera to easily tell if the subject is in front of or behind the current focal plane of the lens. On the other hand many mirrorless cameras use what is known as contrast detection AF. This type of AF analyzes the image from the sensor and looks at higher contrast areas to determine whether the image is in focus. The big drawback of contrast detection is that strictly speaking, a contrast detection AF system does not know if the subject is in front of or behind the current plane of focus. This results in a phenomenon known as “pulsing” which is a rapid back and forth movement of the focal plane. Pulsing can be visually confusing to the photographer and it can be distracting if it occurs while taking a video.

    Some mirrorless camera systems such as Canon RF use a specially designed image sensor to achieve phase detection. This image sensor is called a Dual Pixel AF sensor.

    In addition to Dual Pixel modern mirrorless cameras also use machine learning algorithms to help the camera get focus more easily.

    The arrangement of using a mirror has one major benefit aside from allowing the photographer to see the true optical image formed by the lens. The mirror allows the sensor to be turned off all of the time unless the the camera is actually taking a picture. Keeping the main imaging sensor off saves battery power and lowers heat production inside the camera, and it allows the sensor to perform at a slightly higher level. If DSLR’s had the same quality sensors in them as mirrorless cameras there would be a distinct advantage in noise, battery life, and overall image quality for the DSLR.

    On the other hand, a mirrorless camera has some major advantages with its setup. The first is that the mirrorless camera has lower mechanical complexity which means there is a little less that can go wrong with it over time. Another big advantage is that since there is no mirror to move, the AF systems can run constantly which improves the accuracy of subject tracking.

    Mirrorless lenses can also be designed with less back-focus distance which makes some kinds of more complicated designs easier to achieve on mirrorless systems than on a DSLR system.

    Physically, a mirrorless camera body is usually smaller and lighter, largely owing to the removal of the mirrors, prism, and optical light path that exists in a DSLR. If you are a professional who has multiple cameras these differences add up, especially when trying to fit lots of gear inside a carry on bag or hard case.

    Depending on your preferences as a photographer you might prefer one style of camera over the other. Many photographers still prefer the optical viewfinder in a DSLR because it offers the purest and most truthful view through the lens when you’re framing up a shot. Those photographers usually dislike electronic viewfinders for one or more reasons, the #1 being that they find looking through the electronic viewfinder fatiguing. This is due to to the artificiality of EVF’s and how they work. Even though I personally don’t dislike EVF’s when I use them, whenever I use a 1 series Canon camera with an optical viewfinder it’s sort of like a breath of fresh air. There’s just so much more to see when actual photons from the scene hit your retina, there’s something to that which is very hard to match with an LCD.

    Despite that I still prefer mirrorless cameras because I like not having to look through the viewfinder all the time. Being able to use the rear LCD screen is a great aspect of using a mirrorless camera. It makes taking pictures at odd angles super easy and fun to do. If you work with people it makes getting different kinds of shots a little faster and less distracting to your subject as well.

    While it may seem that DSLR’s and mirrorless cameras are totally different from one another, they aren’t. They’re much more similar than different as a lot of the technology used in mirrorless camera comes from or exists in DSLR cameras now. This includes things like Dual Pixel sensors. Many of the latest DSLR’s can essentially function in a mirrorless mode where the mirror is locked up and the camera then basically works how a mirrorless camera does.

    One nice thing about Canon and Nikon DSLR cameras is that they use the same lenses as a film camera. This means that you can have the same investment in gear and still shoot both a film camera and a digital camera. While film is tough sell in 2022 its a fun thing to mess around with, especially if you do your own development of the photos. Film embodies the artists way of thinking about photography and the personal touch of involving yourself in every step of making the image.

    The main differences end up being how the photographer sees through the lens. With a mirrorless camera you never get to see through the lens which is something important to a person with an artistic mindset. And that is someone who sees details that other’s don’t see. DSLR’s let the photographer immerse themselves in the world they’re taking pictures of where as Mirrorless camera’s force you to watch the world through a screen.

    The pictures each create are virtually identical, it’s the experience of the photographer that is different. Because of that I think Mirrorless cameras are better than DSLR’s. Even though that DSLR mirror view is amazingly true to life, the advantages of mirrorless cameras are too numerous to be ignored.

    Final conclusion; mirrorless cameras win the battle between mirrorless and DSLR’s.

    Shawn
    • Website

    Shawn is the Editor and Co-Founder of Learn Photography Skills. In addition to Learn Photography Skills you can find Shawn's work at: www.kenesseystudios.com

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