Nikon 500mm f/4 AFS I vs 300mm f/4 AFS + TC-17E II

Click for Full Size

The set up:

• 100% crops
• See file name on pic for f-stop and lens
  
• Nikon D90
  
• ISO 400
• Minimum shutter speed 1/400
• Maximum shutter speed 1/2000
• Exposure Delay Mode ON (similar to mirror lock up)
• Remote shutter release
• 21ft from target
• Gitzo tripod
• Induro BHD2 ballhead, full lock down
• 1000 watts of light

I did everything I could think of to make a fair test. The ISO is at 400 because I really wanted fast shutter speeds. Even though I had everything locked down on a tripod, with a remote and exposure delay mode on, I figured it would be better to bring the ISO up a tad, and get really fast shutter speeds.