I'm really enjoying the 400, it best matches my use needs. I just figured out it was an export setting. The 400 f4.5 is perfect for me and despite what the internet says, the Z7 can capture moving objects . With the 45mp sensor, I prefer to shoot Fx and crop, that way I don't miss a close fly by.I sure like seeing the exif data for some reason, I hunt for it, lol! It seems incomplete when it doesn't show up. Bummer the eagles got their exif data stripped. Nice shots tho! How do you like shooting with the 400? Do you find it too short for birds or by switching into DX on your Z7, is 600 effective FOV sufficient in most scenarios? May I ask why you dont care for the teleconverters? I have the 2x I use with the 70-200 and I'm pleased with the results as long as theres enough light. Do you not like using converters in general or just with the 400?