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600mm f/4 VR with 2x TC III Nikon
Still confused about DoF I see. Play around with that table and maybe you'll eventually catch on. Re: sharpness, even Ken Rockwell says that the modern dslr will start to show diffraction effects at apertures smaller than f8 and recommends stopping down no more than 1-2 stops smaller than the... -
600mm f/4 VR with 2x TC III Nikon
Are you confused? Smaller apertures aka larger f numbers INCREASE DoF. Unless you have something close in the foreground, say withing 20m, you want to be sharp in the shot, most landscape shots are at infinity focus anyway so F4 on that lens will be plenty sharp for an 20" print. -
600mm f/4 VR with 2x TC III Nikon
And Ansel Adams said waaay back in 1937, "Any good modern lens is corrected for maximum definition at the larger stops. Using a small stop only increases depth..." Hmmm, I guess we have a cunundrum?? If you want to shoot a 2009 vintage US$2000+ f2.8 lens at f8, knock yourself out. But I bet... -
600mm f/4 VR with 2x TC III Nikon
Why did you choose to shoot this at f10? I would think the 400mm/f2.8 + 2xTC would give optimal sharpness if you stop down from f5.6 to perhaps f6.3. Certainly not more than F8! You would have shot a faster shutter speed (1/1200sec?) that might improve your results. Moreover, an f10 aperture...