Mirrorless is the name registered by Sony in China, which means miniature single-lens mirrorless electronic viewfinder camera. The more famous ones include Sony's NEX series, Panasonic GF series, etc. SingleLensTranslucent refers to a single-lens electronic viewfinder camera. Its appearance is almost the same as that of a SLR, but it uses semi-lens technology to replace the reflector of the SLR to improve video shooting and continuous shooting capabilities. The current model is represented by the Sony A77 . The biggest difference between a mirrorless SLR and a SLR is that there is no reflector, and the viewfinder system and focusing system on the top of the camera are different; while the biggest difference between a SLR and a SLR is that the reflector is replaced by a semi-lens, and the focus system is moved from the bottom to the top of the camera. , real-time viewfinding is realized through the electronic viewfinder (EVF), and what you see is what you get for photography effects.

Before Sony launched the "mono-camera", "mono-camera" (single lens electronic viewfinder camera) was the official name of Panasonic and Olympus, and was used to refer to all mirrorless, electronic viewfinder cameras. Viewfinder (EVF), a digital camera with interchangeable lenses. Later, Sony launched the NEX series, named "mirror single camera", and also launched a "single electronic camera", which caused confusion in this concept. Sony defines a "single electronic camera" as a camera with full manual operation, fixed translucent mirror technology, and electronic viewfinder. Among them, fixed semi-lens technology has a great impact on imaging and is controversial. It is only used exclusively by Sony.

"The most fashionable among professional cameras, the most professional among fashionable cameras" has become the subtext that distinguishes "mirror single" cameras from SLR cameras and card-type digital cameras.

"Mirrorless" cameras use sensors with the same specifications as SLR cameras. They cancel the optical viewfinder components on SLR cameras. There is no prism and mirror structure, which greatly reduces the distance from the lens mount to the sensor. Therefore, a smaller body than a SLR can be obtained, and the imaging quality is also guaranteed to be the same as that of a SLR.