How Does A Mirrorless Camera Work?

17 minutes read

A mirrorless camera operates by directing light directly through the lens to an image sensor, without the use of a reflex mirror to redirect the light to an optical viewfinder, as seen in traditional DSLR cameras. This allows for a more compact and lighter body design. The absence of the mirror mechanism also enables faster continuous shooting and quieter operation. Instead of an optical viewfinder, most mirrorless cameras use an electronic viewfinder or the rear LCD screen to compose and preview shots. This electronic viewfinder displays the image captured by the sensor, providing a real-time preview of how the final image will look, including exposure, white balance, and other settings. This real-time preview can be advantageous for photographers as it helps them assess the effect of the exposure and other settings before taking the shot. Additionally, mirrorless cameras often feature advanced autofocus systems, such as phase detection or contrast detection, integrated directly on the sensor, offering quick and precise focusing capabilities. Overall, mirrorless cameras offer the benefits of a smaller form factor and advanced features without compromising the image quality associated with larger, traditional DSLR cameras.

Best Mirrorless Cameras of February 2025

1
Sony a7 III (ILCEM3K/B) Full-frame Mirrorless Interchangeable-Lens Camera with 28-70mm Lens with 3-Inch LCD, Black

Rating is 5 out of 5

Sony a7 III (ILCEM3K/B) Full-frame Mirrorless Interchangeable-Lens Camera with 28-70mm Lens with 3-Inch LCD, Black

  • Advanced 24.2MP BSI Full-frame Image Sensor w/ 1.8X readout speed Advanced 24.2MP Back-Illuminated 35mm Full-frame Image Sensor
  • 15-stop dynamic range, 14-bit uncompressed RAW, ISO 50 to 204,800
  • Up to 10fps Silent or Mechanical Shutter with AE/AF tracking
  • 693 phase-detection / 425 contrast AF points w/ 93% image coverage
2
Canon EOS R8 Mirrorless Camera RF24-50mm F4.5-6.3 is STM Lens Kit, Full-Frame Hybrid Camera, 24.2 Megapixel CMOS Image Sensor, 4K Video, Content Creator Vlogging Camera, Black

Rating is 4.9 out of 5

Canon EOS R8 Mirrorless Camera RF24-50mm F4.5-6.3 is STM Lens Kit, Full-Frame Hybrid Camera, 24.2 Megapixel CMOS Image Sensor, 4K Video, Content Creator Vlogging Camera, Black

  • Step up to full-frame with Canon’s lightest full-frame RF Mount mirrorless camera featuring a 24.2 million pixel CMOS image sensor and DIGIC X Image Processor.
  • An affordable and compact camera with built-in 0.39” 2.36 million dots OLED EVF up to 120 fps refresh rate and 3.0” 1.62 million dots vari-angle LCD touchscreen.
  • Uncropped 4K movie at up to 60 fps that is oversampled from 6K, Full HD High-frame rate movie recording at up to 180 fps2, and Canon Log 3 or HDR PQ. Max movie record time of 2 hours3 and UVC / UAC for webcam and streaming4
3
Sony Alpha A6100 Mirrorless Camera with 16-50mm and 55-210mm Zoom Lenses, ILCE6100Y/B, Black

Rating is 4.8 out of 5

Sony Alpha A6100 Mirrorless Camera with 16-50mm and 55-210mm Zoom Lenses, ILCE6100Y/B, Black

  • World’s fastest AF at 0 02 sec W/ real-time AF & Object tracking
  • Wide 425-phase/425-contrast detection AF points over 84% of sensor
  • 24 2MP APS-C Exmor sensor w/ front end LSI and ISO up to 51 200
  • Up to 11fps continuous shooting at 24 2MP RAW w/ AF/AE tracking
  • Real-time AF Tracking Real-time Eye AF for human and animal
  • Movie recording with mic and 180-degree tiltable 3” touchscreen LCD
  • Display Size: 3"; EXPOSURE COMPENSATION: +/-5.0 EV (1/3 EV, 1/2 EV steps selectable)
4
Nikon Z fc with Wide-Angle Zoom Lens | Retro-inspired compact mirrorless stills/video camera with 16-50mm zoom lens | Nikon USA Model

Rating is 4.7 out of 5

Nikon Z fc with Wide-Angle Zoom Lens | Retro-inspired compact mirrorless stills/video camera with 16-50mm zoom lens | Nikon USA Model

  • Superb image quality: 20.9 MP DX CMOS sensor paired with EXPEED 6 processing engine
  • Vlogger Ready: 4K UHD, Flip out Vari-angle LCD, full time AF with eye detection, built-in stereo microphone, external microphone jack, live stream and web conference compatible
  • Heritage Design: Classic tactile design with analog controls for shutter speed, ISO and exposure compensation
5
Sony Alpha a6400 Mirrorless Camera: Compact APS-C Interchangeable Lens Digital Camera with Real-Time Eye Auto Focus, 4K Video, Flip Screen & 16-50mm Lens - E Mount Compatible - ILCE-6400L/B, Black

Rating is 4.6 out of 5

Sony Alpha a6400 Mirrorless Camera: Compact APS-C Interchangeable Lens Digital Camera with Real-Time Eye Auto Focus, 4K Video, Flip Screen & 16-50mm Lens - E Mount Compatible - ILCE-6400L/B, Black

  • 20.1MP stacked back illuminated 1" Exmor RS CMOS sensor w/ DRAM, large aperture 24-70mm1 F1.8-2.8 ZEISS Vario-Sonnar T lens
  • Enhanced subject capture: wide 425 Phase/ 425 contrast detection points over 84 percent of the sensor
  • Fast and accurate: Up to 11Fps continuous shooting at 24.2 MP raw with crisp, clear natural colors
  • Multiple movie functions: Make time lapse movies or slow/quick motion videos without post processing
6
Sony Alpha ZV-E10 - APS-C Interchangeable Lens Mirrorless Vlog Camera Kit - Black

Rating is 4.5 out of 5

Sony Alpha ZV-E10 - APS-C Interchangeable Lens Mirrorless Vlog Camera Kit - Black

  • Large 24.2MP APS-C Exmor CMOS Sensor and fast BIONZ X processor
  • 4K Movie oversampled from 6k w/ full pixel readout, no pixel binning
  • Product Showcase Setting transitions focus from face to object
7
Canon EOS R50 Mirrorless Camera RF-S18-45mm F4.5-6.3 is STM Lens Kit, 24.2 Megapixel CMOS (APS-C) Sensor, 4K Video, Hybrid Camera, Photo and Video, Vlogging, Content Creator, RF Mount, Black

Rating is 4.4 out of 5

Canon EOS R50 Mirrorless Camera RF-S18-45mm F4.5-6.3 is STM Lens Kit, 24.2 Megapixel CMOS (APS-C) Sensor, 4K Video, Hybrid Camera, Photo and Video, Vlogging, Content Creator, RF Mount, Black

  • High Image Quality: Canon EOS R50 4K digital camera features a 24.2 Megapixel CMOS (APS-C) sensor and DIGIC X processor for stunning image clarity and level of detail
  • High-Speed Continuous Shooting: Capture fast action with up to 12 fps with Electronic First Curtain shutter and up tp 15 fps with Electronic Shutter for a superior vlogging camera
  • Advanced Auto Focus: Dual Pixel CMOS AF II covers up to 100% x 100% area with 651 AF zones; features auto subject detection and tracking of people, animals, and vehicles using deep learning technology — perfect 4K camera for video recording
  • Exceptional Low-Light Performance: Advanced A+ Assist offers an expanded array of auto-compatible scenes for greater expressive capability in auto mode and enables great imagery even in difficult settings such as night and backlit scenarios.
  • Superior Viewing Experience: 2.36-million-dot EVF with Clear View LCD II vari-angle touchscreen on this digital camera for easy composition and shooting from virtually any angle
8
Panasonic Lumix G7 4K Digital Mirrorless Camera Bundle with Lumix G Vario 14-42mm and 45-150mm Lenses, 16MP, 3-Inch Touch LCD, DMC-G7WK (USA Black)

Rating is 4.3 out of 5

Panasonic Lumix G7 4K Digital Mirrorless Camera Bundle with Lumix G Vario 14-42mm and 45-150mm Lenses, 16MP, 3-Inch Touch LCD, DMC-G7WK (USA Black)

  • Photo and video capability 16 Megapixel micro Four Thirds sensor confidently captures sharp images with a high Dynamic Range (HDR)
  • 4K capture 4K Ultra HD video recording (3840 x 2160) Plus 4K PHOTO pause and save frame that extracts individual high-resolution photos from 4K Ultra HD video
  • High-resolution viewfinder and LCD display high-resolution (2 360k-dot) OLED live view Finder and rear touch-enabled 3-inch tilt/swivel LCD display (1 040-dot) are clear even in bright sunlight


What are the common brands of mirrorless cameras?

Mirrorless cameras have gained popularity due to their compact size and advanced features. Some of the most common and reputable brands in the mirrorless camera market include:

  1. Sony: Known for their Alpha series, such as the A7 and A6000 lines, Sony is a pioneer in the mirrorless market, offering a wide range of models catering to both professionals and enthusiasts.
  2. Canon: Canon's EOS R series is their flagship line in the mirrorless segment, featuring a range of cameras for different skill levels and needs.
  3. Nikon: Nikon offers the Z series, which has been well-received for its high-quality imaging and robust design, aimed at both professional and amateur photographers.
  4. Fujifilm: Renowned for its retro design and excellent image quality, Fujifilm's X series, such as the X-T and X-Pro models, are popular among enthusiasts and professionals alike.
  5. Panasonic: Known for the Lumix G series, Panasonic provides cameras that are especially popular among videographers, due to their video features and performance.
  6. Olympus: With its OM-D series, Olympus is known for producing mirrorless cameras that are lightweight and packed with features, appealing to travel and outdoor photographers.
  7. Leica: Although more niche and premium, Leica offers high-quality mirrorless cameras like the SL series, known for their exceptional build quality and image performance.


These brands offer a wide range of models, each with their own unique features, catering to various levels of expertise and specific photographic needs.


What accessories are essential for mirrorless cameras?

When utilizing mirrorless cameras, various accessories can enhance your photography experience and improve the quality of your images. Here are some essential accessories to consider:

  1. Lenses: Additional lenses are crucial, as they allow you to adapt to different shooting conditions. Common choices include wide-angle lenses, prime lenses for portraits, and telephoto lenses for capturing distant subjects.
  2. Extra Batteries: Mirrorless cameras tend to consume more power due to their electronic viewfinders and displays. Carry extra batteries to ensure you don't run out of power during a shoot.
  3. Memory Cards: High-capacity and high-speed memory cards are essential for storing large files quickly, especially if you're shooting in high-resolution formats or capturing video.
  4. Tripod: A sturdy tripod is vital for long exposure photography, landscape shots, and situations where stability is needed to reduce motion blur.
  5. Camera Bag: A well-designed camera bag helps protect your camera and accessories while making it easier to transport them.
  6. External Flash: This can be useful for low-light conditions and for providing fill light to improve your photos' overall quality.
  7. Filters: Polarizing, ND (neutral density), and UV filters can help enhance image quality in different shooting situations.
  8. Lens Cleaning Kit: Keep your lenses and camera sensor clean for optimal performance and image clarity.
  9. Remote Shutter Release: This is useful for preventing camera shake during long exposures or when taking group photos.
  10. Screen Protector: Protecting your camera's LCD screen from scratches can help maintain its resale value and ensure it's easy to view.
  11. External Microphone: If you're recording video, an external microphone can significantly improve audio quality compared to the camera’s built-in option.
  12. Camera Strap: A comfortable and durable strap can prevent drops and make carrying the camera less tiring over long periods.


These accessories can significantly enhance your mirrorless camera setup, catering to both amateur enthusiasts and professional photographers.


How do I adjust the ISO on a mirrorless camera?

Adjusting the ISO on a mirrorless camera can vary slightly depending on the brand and model of your camera, but the process is generally straightforward. Here’s a general guide to help you:

  1. Turn on Your Camera: Make sure your camera is powered on and set to a mode that allows manual control of settings. Modes like Aperture Priority (A/Av), Shutter Priority (S/Tv), or Manual (M) usually allow ISO adjustments.
  2. Find the ISO Button: Many mirrorless cameras have a dedicated ISO button on the body, often labeled "ISO". Pressing this button will typically bring up the ISO settings on your screen or viewfinder.
  3. Use the Camera Menu: If there isn’t a dedicated ISO button, you can always adjust the ISO through the camera's menu. Press the "Menu" button on your camera, then navigate to the shooting settings where you’ll find the ISO settings.
  4. Use Dials or Touchscreen: On some models, once the ISO menu is activated, you can use the camera's dials to scroll through and select your desired ISO setting. If your camera has a touchscreen, you might be able to tap directly on the screen to change the ISO.
  5. Auto ISO: Many cameras offer an Auto ISO feature, which allows the camera to automatically select an appropriate ISO based on the lighting conditions. This can be useful in rapidly changing light or for beginners.
  6. Confirm Your Selection: Once you’ve selected the desired ISO setting, make sure to confirm it. This might involve pressing an "OK" button or simply exiting the menu, depending on your camera.
  7. Check Results: After making your adjustment, take a few test shots to ensure you’re satisfied with the exposure and noise levels.


If you're unsure about specifics due to different models, refer to your camera's manual for detailed instructions. As always, understanding how ISO affects exposure and noise will help you make better decisions when adjusting it.


What are the advantages of mirrorless cameras?

Mirrorless cameras have become increasingly popular due to several advantages they offer over traditional DSLR cameras. Here are some of the key benefits:

  1. Compact and Lightweight: Without the reflex mirror and optical viewfinder, mirrorless cameras are generally smaller and lighter than DSLRs, making them more portable and easier to handle, especially for travel or prolonged use.
  2. Faster Shooting Speed: The lack of a mirror allows for quieter and faster continuous shooting. Mirrorless cameras can achieve higher frame rates, making them ideal for capturing fast-moving subjects.
  3. Electronic Viewfinder (EVF): Mirrorless cameras use electronic viewfinders (or LCD screens) that provide a real-time preview of the image, including exposure, white balance, and depth of field. This real-time feedback can be beneficial, especially for beginners.
  4. Live View and WYSIWYG: The "What You See Is What You Get" nature of the electronic viewfinder or screen means you can see exactly how the final image will look, allowing for adjustments before taking the shot.
  5. Advanced Autofocus: Many mirrorless cameras offer advanced autofocus capabilities, including faster and more accurate eye and face detection and a larger focus area covering almost the entire frame.
  6. Video Performance: Mirrorless cameras often excel in video recording, offering high-resolution video (4K and beyond), with advanced video features and superior autofocus performance during video capture.
  7. Versatile Lens Compatibility: With the use of adapters, mirrorless cameras can often use lenses from several different platforms, including legacy lenses designed for SLRs and DSLRs.
  8. Increased Innovation: Because mirrorless technology is relatively newer, manufacturers are consistently innovating, leading to rapid improvements in sensor technology, autofocus, and other features.
  9. Silent Shooting: Mirrorless cameras can often shoot silently (without the noise of a mirror flipping), which is advantageous in sound-sensitive environments, like weddings or wildlife photography.
  10. Better Stabilization: Many mirrorless cameras come equipped with in-body image stabilization (IBIS), which helps to keep shots steady even with lenses that do not have built-in stabilization.


While mirrorless cameras offer these advantages, they also have some downsides, such as shorter battery life compared to DSLRs and, depending on the model, a potentially higher cost. However, the gap is continually narrowing as technology advances.

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