Whether to Use a Teleconverter in Wildlife Photography

JF929 wrote:

I totally agree that different equipment combination yields different results. But in principle, a 1.4TC reduces resolution by 1.4x, a 2.0TC reduces resolution by 2x, even in an ideal optics. In reality, the resolution is even more. When the optic resolution dips below sensor resolution, there will be no gain in image resolution by using a sensor with more pixel/mm. That is what I found in full frame/crop frame comparison.