Why Sony Full-Frame Mirrorless DSLR Camera
Sony A7 III Overview
A full-frame digital single-lens reflex camera (DSLR) is one with an image sensor format that is the same of a 35 mm size format (36 mm × 24 mm) film. Historically, 35 mm was considered a small film format compared with medium format, large format and even larger.
The full-frame DSLR is also similar to the full-frame mirrorless interchangeable-lens cameras. Many digital cameras, both compact and SLR models, use a smaller frame than 35 mm frame as it is easier and cheaper to manufacture image sensors which has a smaller size. The earliest digital SLR models, like the SONY F4 or Kodak DCS 100, also used a smaller sensor.
Use of 35mm film-camera lenses
The image shows the difference in the size of the sensors between an APS-C format DSLR (left) and a full-frame DSLR (right) .
full-frame DSLRs offer a number of advantages compared to their crop-sensor images. The advantage is wide-angle lenses which are designed for 35mm retain the same wide angle view of image. On crop-sensor DSLRs, wide-angle lenses have smaller angles of View.
Two photographs with the same lens and ISO, but a different sensor size: upon zooming in (insets), one notices there is less noise in the bottom picture (full-frame sensor) than in the top one (smaller sensor).
Full Frame vs. Crop Frame Sensor – The Field of View and Focal Length
The most common difference between full frame and crop sensor is their field of view. In fact the term “crop” says just exactly that. This means that if a full frame DSLR like a Nikon D800 and a crop-sensor DSLR like a Nikon D5600 take the same photo from the same distance, with the same lens and point of view, the D5600 will capture a tighter field of view than the D800.
An Example of a full frame and a crop frame image
Focal length measurements on lenses are based on the 35mm standard. The amount of difference in the field of view or focal length with a crop sensor is measured by its “Multiplier.”
For an example, a Nikon APS-C sensor has a 1.5x multiplier.Where, When a Nikon 50mm f/1.4 lens is attached to that Nikon DSLR, the focal length is multiplied by 1.5x and effectively acts like a 75mm lens on a full frame DSLR which is the change.
Advantages And Disadvantages Of Full Frame And Crop Sensors
There are several advantages and disadvantages to each sensor size. We are going to avoid the technical details and just give you the most practical and general information.
Advantages of a Full Frame sensor – Generally, a full frame sensor can provide a broader dynamic range with better low light or high ISO performance yielding a very higher quality image than a crop sensor. Full frame sensors are also preferred when it comes to architectural photography due to having a wider angle which is useful with tilt or shift lenses.
A full frame DSLR will have a shallower depth of field than a crop sensor DSLR, which can be a beneficial asset. When shooting at the same EFFECTIVE focal length, using the same aperture settings and shooting from the exact same angle/distance to the subject, the full frame camera will have a shallower depth of field (bokeh effect) than the crop sensor camera.
This is because the larger the sensor, the longer the focal length of the lens needs to be to capture the same field of view. For an example, on a Canon 5D Mark III using a Canon 50mm f 1.4 lens gives the same focal length or field of view as using a 31mm lens on a Canon 7D. since it has a 1.6 crop multiplier which is equal to a 50mm. Now a 31mm lens doesn’t exist, but you get the idea. The larger the sensor, the longer the focal length required to create the same field of view, hence a shallower depth of field is created due to the additional focal length.
Advantages of a Crop-Sensor – While a crop sensor DSLR doesn’t provide the same level of image quality as a full frame DSLR, it does offers major advantages when it comes to cost. It can also be very effective for telephoto photography. For example, this can be very useful when shooting sports, wildlife, and other types of journalism photos. Just imagine that on a Canon crop frame body such as a Canon 7D, your Canon 70-200mm f 2.8 lens can also be effective as a 112-320mm lens!
Let me clarify that this is a benefit, it doesn’t mean that you SHOULD use a crop sensor DSLR when shooting these types of photography. This is going to depend on your personal use, budget, and so on. For those on a budget, the additional focal length and low cost of the DSLR are great advantages. But, for a professional, you will get the best overall quality by having a full frame DSLR along with a longer telephoto lens.