Scott_online wrote in post #19570655
I'm curious about the EXIF. 100-400 @ 1320mm, f22 ? That must be quite a stack of teleconverters.
Yessir (would've worked even better, but the weather started going south) 
2x + 2x + 100-400, giving me effective working range of 400-1600mm, but at the cost of f/18-f/22.
Additionally, also at longer ranges, can really see the atmospheric distortions coming into play by the humidity in the air. 
Was a fun experimentation and "poor man's" super-duper telephoto zoom. Incredibly, the AF still worked, more sluggish understandably, but worked.
For next time, I think I'll use the 2x + 1.4x + 100-400 combo. That will bring down the aperture by a stop, still provide me with 280-1140 mm effective range, and probably allow autofocus to work a hair better, hopefully.