This is great BUT you need to learn this tool. My experience with these teleconverters was with the Nikon D7500 and the Sigma 150-600c telephoto lens. A lot of people will scold teleconverters, and I myself first bought the TC-1401 and didn't like it. I didn't understand some basics of photography and COVID gave me a better understanding as I was on a break from work. I had poor results at first until I tried again a month later on a bright sunny day. Then I spent time learning how to use it and more importantly WHEN to use it. After getting to know the device, I also bought the TC-2001. I use both, but only when appropriate. In my opinion, both work well if you're shooting the sun, moon, and wildlife on bright, sunny days. It's usually only 3 times when I use them. Of course, other bright and sunny times that are not in the wild, such as spotting, can also apply. I did have some success on hazy, overcast days, but only after getting to know the triangle well enough to compensate (aperture, shutter speed, ISO). I had a motionless eagle once, and it was for so long that I got a little bored on that foggy day when I probably took 100 photos of it doing nothing, so I said "what the hell" and pulled my TC-2001 because I had nothing to lose. I played around with the triangle until I was able to get great close-up shots even on cloudy days. I probably took 800 horrible shots until I found a triangle combo that worked. For wildlife, they are good as long as the wildlife is silent. For fast-moving subjects like a bird in flight, as long as my skill level doesn't allow me to focus quickly. I should note that I have an injured index finger which makes focusing with my left hand while holding my body painful unless I'm moving very slowly. I'm sure some less disabled people can handle it, especially if the bird isn't flying towards or away from you. IF you use a tripod this might work, I don't know, I rarely have a tripod handy wherever I go. FOCUS: TC-1401: The TC-1401 allows me to autofocus over the entire range. TC-2001: With the TC-2001 you lose autofocus about halfway through the lens (about 300 feet) and after that it still tries to focus but won't lock. You can zoom in with auto focus and then switch to manual focus. TC-2001: At 150, 180, 200, 250 and 300 (lens on the side of the lens) the autofocus worked quite well. I couldn't do 400 and above. force it to focus other than manual. He danced sharply, then blurred again, unable to focus. However, with manual focus, I can shoot in bright light. F-STOPS: TC-1401: (changes listed only) 150 mm = F7.1-F32200 mm = F7.6-F36300 mm = F8-F36400 mm = F8.5-F40600 mm = F9-F42TC-2001: (only listed changes) 150mm = F10-F45200mm = F11-F51400mm = F12-F57600mm = F13-F57 STACKING: Either I'm bad at puzzles or you can't put 1.4 and 2.0 together. Like anything else, you must inspect the instrument before disposing of it. I use both teleconverters with a D7500 crop sensor, which gives me the equivalent of 1800mm. I am satisfied with both teleconverters. If it is cloudy on the birding day, they will stay in the suitcase/bag. I mainly shoot handheld (usually at a very fast shutter speed of 1500+ when shooting handheld from the farthest distance). I only use a tripod for moon/sun shots, and even then not always with a tripod. A Facebook group is dedicated to the Sigma 150-600c, in which photos are regularly posted with and without the two teleconverters.
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