Good day,
I want to ask for help with choosing the telephoto lens for mainly planespotting and airshows. Now, I have 3 Canon lenses - 10-18 STM, 24-70 f/4L and 70-200 f/4L, the body is 70D. I shoot mainly planes and airshows, but it will be used at other fields(landscape, etc.). I really like the 70-200 f/4L, but I find out, that it's a bit short sometimes, mainly on airshows on smaller planes. The second problem is a missing IS.
So I started looking for something to upgrade the 70-200. I narrowed it to three candidates - Canon 70-300L, Sigma 150-600 Sport and 100-400 L II. I don't know, which to choose, the 100-400 is obviously best, but I would probably have to sell a kidney to buy it. I'm not a pro and I think lens this expensive is pointless now. Sigma 150-600 Sport looks good, but I'm affraid because of the image quality and how would the AF of 70D handle it (I had Tamron 70-300 and it was pretty hit and miss). The most I lean for 70-300L, which is light enough, will offer good IQ and I would have all my body parts, because its not that expansive. I'm affraid, that it would be short. But around the airports, there is a lot of heathaze, so I dont know, if longer lens would be a win. I would love to have the best IQ.
Thank you very much for some help and if you have other suggestions, I'm open for them.













So I'm affraid, that C version, or Tamron wont meet my expectations. 
