People often ask about teleconverters. They sound like a great idea. For a 200mm lens, you can use a 1.4x TC to make it 280mm. Or you can use a 1.7x TC and make it 340mm. Or a 2.0x TC and turn it into 400mm! Of course, you also have to lower your f/stop ability by the same factor (an f/2.8 with a 2.0 TC turns into an f/5.6 lens), but it sounds like for a lot less money, you can get yourself a much higher power lens on the cheap. Do these things work? Most people already know that that the higher magnification that you use, the more the image quality deteriorates. But is it still usable? And does the image quality degrade that much for basic usage? In this article we’ll take a look. I have a mix of different lenses and teleconverters collected over the years. A Sigma 150-600mm Contemporary, a Nikkor 200-500mm f/5.6, and an old Nikkor 1000mm reflex lens. For teleconverters, I have the same brands as lenses, Nikon, and Sigma. For the camera, I’m using a Nikon D850.
The Nikkor 200-500mm
The first lens we’ll look at is the Nikkor 200-500mm lens. The TC used was the Nikon AF-S FX TC-14E III. To try this combo out I went to a local bird sanctuary. The wind was blowing, and lens was catching the wind making it difficult to hold the camera still. I used a monopod to try and brace the camera for these photos. The combination of the lens and TC was able to produce sharp images. Figure 1 shows an image taken with this combination.
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