Should I utilize a teleconverter?
There are advantages and disadvantages to utilizing a teleconverter, so you have to choose if utilizing one is a good fit for the sort of photography you're wanting to do.
Benefits incorporate their cost effectiveness and small physical size; disadvantages include lost light or lens speed and conceivable decreass in sharpness. A 300mm lens and 2x teleconverter will not be as sharp as a fixed 600mm lens. Additionally, all NIKKOR lenses may not be compatible with every teleconverter. At the bottom is a table of teleconverter/NIKKOR lens compatibility.
Teleconverters are advantageous when you need to increase the apparent telephoto reach of a particular NIKKOR lens, particularly when contrasted with the physical size of some of the of the longer super-telephoto NIKKORs. Likewise, when you utilize a teleconverter, you don't lose the lenses close focusing distance, which is an additional advantage.
Since teleconverter similarity is reliant upon lens utilization, the lenses that are compatible with a teleconverter are all FX lenses (those intended for use with the big FX format picture sensor or SLR film cameras.
AF NIKKOR lenses (those that do not feature a built-in focus motor) are not incompatible with current AF-S teleconverters but rather may function with older manual models. (AF-S lenses are those containing a built-in focus motor.) Some of the more up to date NIKKOR lenses can likewise be utilized with older manual focus teleconverters although limited compatibility. Functional limitations include having to physically focus the lens, shoot in manual mode only, and require an exposure meter because of the camera's on-board meter being rendered inactive. Vignetting or other unmistakable picture defects may likewise happen.
Must I utilize a f/2.8 or faster lens with a teleconverter?
The response to that depends upon the Nikon DSLR body you're shooting with. Up until the D4 was introduced, on the off chance that you utilized a teleconverter with a NIKKOR lens, you'd lose autofocus abilities at apertures smaller than f/5.6, or be required to utilize a slower shutter speed or increase the ISO as a fast aperture wasn't conceivable. Because of these limitations, sports and wildlife photographers wouldn't have the ability to use teleconverters in numerous instances that required faster shutter speeds.
More up to date Nikon cameras, which include the D4/D4S, D600/D610, Df, D800/D800E, D810, D750, D7100 and D7200 permit you to utilize slower lenses with the teleconverters with the capacity to use autofocus usefulness when stopped down to f/8..
Teleconverters for Nikon DSLR Cameras