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Step 1Mirrorless Camera Guide 2018

Mirrorless Cameras

Mirrorless digital cameras are usually mid-size cameras supporting interchangeable lenses. They are system cameras and each model gives access to a set of compatible lenses. In this guide to mirrorless cameras, you will learn what these cameras are good for, plus how mirrorless systems presently compare. There are much more differences between mirrorless systems than DSLR systems, so it is critical to consider both the camera and system before buying.

Mirrorless Camera Sizes

Origins

A mirrorless camera is an interchangeable lens camera without a reflex mirror, the same way that a car is a horseless carriage. Until the appearance of mirrorless cameras, digital cameras with interchangeable lenses were all DSLRs which are defined by having a single lens and a reflex mirror to reflect light towards an optical viewfinder. Mirrorless cameras still have a single lens but no optical viewfinder. The original term, SLD which stands for Single Lens Digital, was easy to confuse and therefore the more descriptive mirrorless name was broadly adopted.

While compact cameras were always appreciated for their size, the same could not be said about their image quality. Meanwhile, DSLRs that consistently deliver excellent image quality are frequently abandoned because of their bulk. Mirrorless cameras were invented to produce high quality images from a compact camera.

Mirrorless Image Quality

The high image quality traditionally attributed to DSLRS stems from the size of their imaging-sensors. All else being equal, a larger sensor will always deliver better image quality since it gathers more light than a smaller one. Mirrorless cameras now use very similar sensors to DSLRs with many sporting APS-C and Full-Frame sensors, just like a DSLR. There are some smaller Four-Thirds and 1" sensors too and even larger Medium Format sensors.

The diagram shown on the right displays sensor sizes used in current mirrorless cameras. All rectangles are to scale and even coincide with actual sizes on most computer displays. There are actually two very similar variants of APS-C with the one used by Canon being fractionally smaller.

There are now several full-frame mirrorless digital cameras with resolutions ranging from 12 to 42 MP. Most are relatively compact, while some are just as large as a high-end DSLR. All these produce image-quality comparable to modern full-frame DSLRs.

Mirrorless Camera Size

The size of mirrorless cameras varies equally widely. Despite being called relatively compact and many having official measurements similar to compact cameras, mirrorless cameras take on bulk once a lens is mounted. When ready to shoot, most mirrorless cameras are the size of a typical ultra-zoom, only with higher image-quality and a shorter zoom range.

A camera's sensor-size influences its operational-size because larger sensors require larger lenses. As image quality gets closer to that of a DSLR, so does the total size of the camera and lens. However, there is no simple relation between image-quality and total-size. Slightly wide to medium focal-length lenses give the most size advantage to mirrorless digital cameras, while telephoto lenses often even the gap.

Mirrorless vs DSLR

Mirrorless cameras are evolving faster than any other type of digital cameras. Being the youngest type of digital camera increases chances for smaller companies to take the lead, so more manufacturers are trying. The speed of this evolution plus tremendous variations among mirrorless cameras means that there are also plenty of misconceptions.

Fuji X-Trans CMOS Sensor

Top 10 Mirrorless Camera Facts

  • 1Image quality from the best mirrorless cameras is comparable to that of a DSLR using a sensor of the same size. The latest Micro Four-Thirds cameras even produce output which is very close for common print sizes until moderately high ISOs when compared with typical APS-C DSLRs.
  • 2A lens influences the image quality of a mirrorless camera just as it does for a DSLR. To get the best out of a mirrorless, a sufficiently sharp lens must be used. Typical kit zoom lenses sold along with cameras are generally built for compactness and low-cost rather than quality.
  • 3In good light, mirrorless cameras are capable of focusing as quickly as mid-range DSLRs. Autofocus performance drops in low-light, as it does for a DSLR. The Contrast-Detect AF used by most mirrorless cameras is as accurate and sensitive as possible. In fact, mirrorless digital cameras cannot front-focus or back-focus since AF is measured directly on-sensor.
  • 4Shooting speed of mirrorless cameras exceeds that of the fastest DSLRs. Continuous shooting up to 60 FPS or 18 FPS with continuous autofocus are available at full-resolution and so are fast shutter-speeds exceeding 1/8000s, which no DSLR can do.
  • 5Mirrorless cameras are quieter than DSLRs because they do not have a reflex mirror to move between shots. Some use an electronic shutter which makes them nearly silent. This is really advantageous for shooting in quiet environments.
  • 6The preview on a mirrorless camera is electronic, just like a fixed-lens digital camera or Live-View on a DSLR. The preview varies considerably in terms of sharpness and accuracy between models. The best offer a sharp Exposure-Priority display and EVF. When resolution is too low, it is hard to confirm focus. When the update rate is slow, following action is difficult.
  • 7Mirrorless cameras are power-hungry because their sensor must constantly feed the digital preview. Plus, mirrorless cameras are often fitted with smaller batteries. As a result, their average battery-life is 350 shots-per-charge, compared to 1036 for DSLRs.*Based on current models as of November 2017.
  • 8Mirrorless cameras are strong in terms of video features. It is possible to shoot video with the camera at eye-level and continuously autofocus while recording, either by on-sensor Phase-Detection or highly optimized Contrast-Detect processors and lenses.
  • 9Plenty of mirrorless cameras are now aimed at professional photographers. Those provide high-end features and controls, including dual or even triple control-dials. A number are now weatherproof and freezeproof and there is a reasonable number of compatible weatherproof lenses. At the extreme end of the spectrum though, there is a waterproof mirrorless while no such DSLR exists.
  • 10Lenses mount closer to the sensor on mostExcept for Sony SLT and Pentax K mirrorless models. mirrorless cameras compared to DSLRs. This makes them more adaptable to use legacy lenses, although features such as autofocus are often lost.
Sony Alpha SLT-A99V

SLT - Mirrorless with Pellicle Mirror

Sony makes cameras the size and shape of DSLRs which use the same sensors and lenses. They call these SLT cameras for Single Lens Translucent. They use a semi-transparent mirror to reflect around 30% of light to focus and metering sensors. Contrarily to an SLR, an SLT has an EVF. This viewfinder can preview exposure, color, white-balance and focus, up to its maximum resolution.

Features

All current mirrorless models provide a number of advanced features, although their accessibility greatly differs. Particularly, all of them include: full manual-controls, manual focusing, custom white-balance, continuous drive and full 1080p HD video capture. Most models also sport a hot-shoe. They all offer a wide range of shutter-speeds, at least matching those of entry-level DSLRs, but most often exceeding them.

Panasonic Lumix DMC-G5 Top
Manual Controls: Both fully-manual (M) and semi-automatic modes (T and V).Manual Controls: Both fully-manual (M) and semi-automatic modes (T and V). Custom White-Balance: Specifies exactly what should be white to the camera.Custom White-Balance: Specifies exactly what should be white to the camera. Continuous DriveContinuous Drive Action Photography: Shutter speeds of 1/1500 or more.Action Photography: Shutter speeds of 1/1500 or more. Night Photography: Reaches shutter-speeds longer than 4 seconds.Night Photography: Reaches shutter-speeds longer than 4 seconds. HD Video: 1280x720 resolution or more.HD Video: 1280x720 resolution or more. Hotshoe: Allows external flash units to be attached.Hotshoe: Allows external flash units to be attached.

The high-speed CMOS sensor and continuous Live-View allows mirrorless cameras to provide features usually unavailable to DSLRs. This includes sweeping panorama capture and shooting of images in multiple aspect-ratios which only a handful of DSLRs can do.

Manual focusing has traditionally been difficult with anything other than an optical reflex viewfinder. However, the majority of mirrorless cameras offer a Manual Focus Assist function which magnifies part of the image to make manual focusing easier. A few add something called Focus-Peaking which highlights edges of in-focus areas, something which is impossible to do with an OVF.

As with all interchangeable lens cameras, the aperture range and minimum focus distance of mirrorless ones is determined by the lens being used. Most lenses support screw-on filters to modify incoming light.

Flash, either built-in or add-on, is limited by a sync-speed just like it is on DSLRs because all-but-one mirrorless cameras use a focal-plane shutter and electronic shutters are still relatively slow. Expect sync-speeds between 1/60 and 1/250s.

Mirrorless cameras have taken video capabilities to the next level. Some can capture Ultra-HD 4K video and record it directly to a memory-card. The leading models can provide clean 4K or 1080p HD output, including embedded timecode. Ultra-high-speed and slow-motion video recording is also quite common with frame-rates from 2 to 1200 FPS.

Next

Proceed to Step 2 to learn about Mirrorless Camera Systems from each manufacturer. There we compare what each brand has to offer considering cameras and lenses as a system.

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