What are the advantages and disadvantages of Nikon D700 and D7000?

D700 is a professional model in Quan Huafu, and D7000 is a semi-professional model.

The D700 is a Quan Huafu with low pixels per inch, good image quality and high sense. D7000 is a half-frame machine, with high pixels per inch, but the picture quality is worse than the actual one. Much better than the card machine.

D700 all-metal fuselage, D7000 semi-metal fuselage.

A single-lens reflex viewfinder camera is also called a SLR camera. Refers to a camera that uses a single lens, through which light shines on the reflector and takes a view through reflection.

The so-called "single lens" means that the photographic exposure light path and the framing light path share a lens, unlike the paraxial camera or the double-reflex camera, the framing light path has an independent lens.

"Reflection" means that a plane mirror in the camera separates the two light paths: when the mirror falls during framing, it reflects the light of the lens to the pentaprism and then to the framing window; When shooting, lift the reflector quickly, and the light can shine on the film or photosensitive element CMOS or CCD.

In this system, the unique design of the mirror and prism enables the photographer to directly observe the image passing through the lens from the viewfinder.

It can be seen from the structural diagram of a single-lens reflex camera that the light reaches the reflector through the lens and is reflected to the focusing screen above to form an image. Through the eyepiece and pentaprism, we can see the scenery outside in the observation window. The light passes through the lens and is reflected by the reflector to the frosted viewfinder.

Through the convex lens and reflected in the pentaprism, the final image appears in the viewfinder. When the shutter is pressed, the mirror moves in the direction indicated by the arrow, and the mirror is lifted to take an image on the CCD, which is consistent with what is seen on the viewfinder screen.

Compared with paraxial cameras, SLR cameras have the advantage that what you see is what you get, and the imaging angle in the viewfinder is the same as the final film. However, compared with paraxial camera, the back focus of SLR camera lens should be able to image at the mirror position and the focal plane of photosensitive element at the same time.

It is necessary to create a false focus before focusing plane imaging, which makes the optical lens structure of SLR camera more complicated and huge, and the imaging effect is not as direct and transparent as that of paraxial camera. At the same time, the volume of the "reflector" should be large.