chrismarriott66 wrote in post #14760821
I'm sure the answer is out there somewhere, but seeing as you guys are currently on topic I may as well ask again...
What is the IQ difference between the 100-400 and the 70-200 + 2x extender (assuming the Canon mk3 TC)? Because if the TC option has acceptable IQ, then it's a lot cheaper than having two lenses!
Sadly, there's no, solid, answer for that question. How much of an effect the TC has on image quality depends entirely on your gear and how the tolerances therein stack up.
I found that, with MY gear, the 70-200 + TC was completely craptastic compared to the 100-400; whereas, others here have gotten terrific results out of it.