>>3964313Agreed 100%. Framing at telephoto distances is exponentially more difficult as your field of view narrows. Zoom is your friend.
>>3964209Birding is more about scoping out nesting/roosting sites and waiting patiently, so it can be done effectively with a fixed focal length. Autofocus is only accessible with elite gear for birding, because you're generally working below the light threshold for it to work well. You're usually better off framing up a roost and just tweaking focus while burst shooting when the bird lands or takes off.
>>3964321I had this same conundrum when I played around with MFT, and I tried one of those ultra-cheap telephotos (Telesar 80-250 f/4.5). The image quality was horrible, even with half the frame cut off, but it was useful for exploring composition.
My $0.02? rent a lens if you want to try birding, or rent a long zoom and try telephoto landscapes too. Film era lenses are only sharp on digital sensors in accidental or unusual circumstances. I tried a bunch of old high-end FD-mount optics on a 6D several years ago, and even on that old sensor, they were pretty poor performers.
