The full-frame digital SLR is a digital single-lens reflex camera. It is equipped with an image sensor the same size as a standard 35mm camera film frame. The usage of the same image sensor size as a traditional 35mm camera helps make FX-format more compatible with most cameras.
DX-format used sensors of slightly different sizes. They are all just about 23 mm in width with a sensor height of about 15. However, the horizontal and vertical pixels can differ significantly. FX allows for a wide-angle lens intended for a full-frame 35mm camera to preserve their same wide angle of view. The pixel size is positively affected by applying the FX-format.
For a given quantity of pixels, the larger sensors allow for larger pixels or photosites, which provide vigorous range and lower noise at higher levels. However, production costs for FX-format can surpass twenty times the cost for the APS-C sensor. DX-format produces a narrower angle of view. Though good for telephoto and macro photography, this effect is a disadvantage for wide-angle photography because a wide-angle lens becomes a standard lens for DX-format.