Nikon FX and DX lenses refer to the format of the image sensor where the lenses are intended to operate. Nikon produces DSLR units on two types of sensor models (FX and DX) – also called full frame and APS-C (or, limit sensor).
Brief explanation of the Full Frame (FX) and APS-C (DX) cameras
The full frame sensor is the larger of the two. This is the size of the 35 mm – 36 mm x 24 mm film frame.
The Nikon DX (or APS-C) sensor is less than 24 mm x 16 mm, which is also slightly higher than the Canon APS-C. The display field (how much of a scene you can see through the viewfinder) is smaller when you use the same lens in an APS-C camera than in the full-frame camera.
For example, a Nikon AF-S 50mm f / 1.8G FX lens in a field view corresponds to a 75mm lens when used on a Nikon DX (or APS-C) camera as well as on the Nikon line D7100. It is often referred to as the “growth factor”.
Thus, the Nikon DX camera has a harvest factor of 1.5x.
The Nikon DX cameras have camera lines D300S and lower. At the time of publication, the Nikon DSLR has four numbers (for example, D7100, D5300, D3200), all cameras in DX format. The Nikon D300S is the only camera in current DX mode with less than four digits in the model number.
Lens FX vs DX
Unlike the Canon system, the Nikon FX and DX lenses can be used with FX or DX cameras. However, the general rule is that DX lenses are designed to be used in Nikon DX camera formats like D7100.
On the other hand, FX-format lenses are generally acceptable for Nikon FX or DX formats. The time you want to consider as a DX lens in an FX lens for a DX camera format is when you consider the wide angle option. Due to the cultural factors mentioned above, the wide angle of the DX lenses is generally cheaper than the corresponding wide angle lenses due to the construction.
A zoom lens of 18-55mm f / 3.5-5.6G works around SEK example 250, while Nikon 16-35mm f / 4G ED VR FX-format costs about 1250 dollars.
The lens kits for DX cameras are usually lenses such as 18-55mm and 18-105mm lenses. Nikon FX standard lens kits are considered as 24-120 mm and 24-70 mm lenses.
Advanced users prefer to spend more money on a better quality FX lens that can be used in a DX camera format because of the overall quality of the objective lens. However, there is a discussion for another day.
DX culture mode with FX-format camera
As mentioned above, DX lenses can be used on Nikon FX cameras such as D4S and D810. This is possible thanks to the intelligent introduction of Nikon by a function called “DX Crop Mode”.
It is important to avoid the DX Crop Mode of heavy sticker that we would otherwise encounter when we use a DX lens on an FX camera by simply recording the images with a small portion in the center of the sensors. Of course, this results in an image with reduced resolution. However, when you consider that the D810 has a 36 MP FX sensor, the DX Crop mode still provides a final image with a resolution of 15.3MP. Not a bad balance.