It only applies to cameras that have a mirror in front of a sensor that reflects an image into an optical viewfinder. Therefore, devices that may visually resemble SLR but have no mirror are not SLRs. So often ultrasounds (due to larger dimensions and designs) fall into the category they do not even fall into.
The SLR delivers significantly better photo quality and recording capabilities versus compact. Due to sensor size, interchangeable lenses and excellent ergonomics, this is almost the only choice for photographers, but to take full advantage of them, it is often necessary to take manual control over many settings. A large number of SLRs at the factory settings have a fairly neutral photo (compared to compactors). If you think the photos will be perfect directly from the camera, you’re loose. The SLR assumes that you already know or intend to learn more advanced recording techniques and that you are not afraid to run Photoshop.
In our opinion, there is no bad SLR today. Even with the cheapest model and lens kit, a skilled photographer will make top-of-the-range photographs. One of the most common mistakes made by beginners is buying an expensive D-SLR body that uses a cheap kit lens. If you do not need a specific function that is delivered by a more expensive SLR, the best option is to buy the cheapest body in combination with a better lens. As a general advice, we recommend purchasing some premium lenses such as 35 or 50 mm f / 1.8 (900 – 1.900 kn depending on the system) or faster zoom, such as Tamron’s 17-55 f / 2.8.
Since 2009, there is another concept of photographic equipment on the market that at first glance resembles the SLR. It is about the Olympus Micro 4/3 system, which although using the interchangeable lens is not an SLR. Unofficially, such appliances are called the EVIL (Electronic Viewfinder Interchangeable Lens), but for obvious reasons, no manufacturer does not want this abbreviation officially unloaded with his model. Currently there are three Olympus and two Panasonic micro 4/3 models (mutually compatible), one Samsung model, and Sony’s announcement. Up until now, we’ve tested all the Olympus models in the newsroom and concluded that the quality of the photos are paired with the SLRs without any problems because they use equally large sensors and accompanying the software of the same characteristics.