The reasons are as follows:
1, the bottom of the price
In the similar performance of the entry-level SLR and micro-single between the micro-single body cost is lower, and thus the body price is usually lower than the same grade entry-level SLR.
2, small size
Benefiting from the elimination of the reflector assembly, the volume of the microsingle body is much smaller than that of a DSLR body with similar performance in the same grade. But in terms of sensor performance, the micro-single and SLR the same.
3, good performance
Micro-single compact, lightweight, beautiful appearance, basic manual functions. High-end micro-single can meet the requirements of quasi-professional photography. 2013 new micro-single, such as Olympus E-P5, Panasonic GX7, etc., with ISO100 and 1/8000 shutter speed, the performance is gradually close to the SLR.
4, rich modeling
Micro-single modeling, style diversity. Sony micro-single to modern modeling as a feature, Olympus and Fuji micro-single is characterized by retro camera appearance, Panasonic is still launching SLR modeling micro-single camera. All types of styling meet the needs of different people.
5, lens selection space
Micro-single lens selection space, due to the micro-single flange distance becomes smaller, through the adapter ring can make a large number of old lenses to regain new life.
Lens price of high-end micro-single lens is generally cheaper than high-end SLR lenses.
Expanded:
Microsimplexes are suitable for home use, travel and quasi-professional photography, there is now a trend to gradually replace the entry SLR.
Micro-single technology principle:
"Micro-single" cameras use the same specifications as the SLR camera sensor, the removal of the SLR camera optical viewfinder components, no prisms and mirrors structure, greatly reducing the lens mount to the photographic element of the distance, so you can get a smaller than the SLR The body also ensures that the imaging quality is the same as that of a DSLR.
Expanded source: Baidu Encyclopedia - Micro SLR