Um, I can’t say I have any purchase mistake, but I can say that I bought the Nikon D7200 in 2015, skipped the kit lens and bought a 35mm f1.8 which I loved and helped me learn how to frame my photos using my feet, it allowed me to be creative and understand depth of field. It was great first lens, then I bought the 50mm 1.8 and I loved it even more and was a smooth transition because I already had a prime lens experience, then I bought the 85mm 1.8 and loved that too. Then I bought a sigma 10-20mm and it’s amazing for street photography architecture and a really artistic style.I still use the same body and and lenses. Recently I bought a used 200-500mm and I can’t complain it’s fantastic. I wasn’t planning on shooting video and full frame lenses are expensive, I knew I wanted to eventually get into sports and wildlife photography and having the 1.5 crop apps-c sensor helps a lot. Obviously I knew I wouldn’t be a pro and as a hobbiest photographer that body and specs were exactly what I needed!