Today marked one year with my 600mm f/4. Not that I was keeping track, but by freak coincidence I noticed that the same trip I made a year ago was the last shoot I had at that place using my 100-400. I was there today in search of Bald Eagles, Whooping Cranes, and then later...Scub Jays. I found none of these today, but had plenty of other subjects to make it a fine trip. Anyway, today marks one year since that beast arrived. I guess I'm now qualified to express an opinion on it. It has become my primary lens (on the 1DsMII). The positives? razor sharp, fast, and built like a tank. When coupled with the Wimberley II gimball head on a 5 series Gitzo tripod, it can handle most any type of shot quite easily. The negatives? Cost and weight. That's it. You'll notice I didn't mention the minimum focusing distance as a negative. It isn't. You NEED that 16 feet (Canon says 18, but I've measured it multiple times at just over 16) to get any DOF at 600mm. I've shot mine many times with a 25mm tube on it, and that works great provided you're shooting a VERY small aperture (better be at f/11 or better in most cases when shooting at less than 16 feet). IMO, anyone with the means to purchase this lens should also have a second body that they will mount with a smaller lens. My 40d does that job quite nicely. If you have the means, and are a serious nature photographer with a pro body, then I recommend this lens highly. You will not be disappointed. Note that I do NOT recommend this lens for the prosumer grade cameras. I find the 1.6 crop factor to be too much on the 600, and it becomes fairly difficult to manage. You'll lose a lot of shots trying to find things in the viewfinder. The 500mm f/4 is a better choice IMO for the prosumer bodies.
I have also created a couple ways to deal with the weight of the lens quite well. After several tial-and error sessions with various carts, I designed my own for boardwalk type trails. It is a triangular cart with 8" pneumatic ball bearing wheels. The rig mounts at-the-ready to it. It is perfect. It's quiet, and literally glides along with just one hand! For non-boardwalk trails, I use the LowePro Street and Field belt and harness system instead of a vest. I use the Manfrotto monopod belt holster on this belt to support one leg of the tripod and distribute the carrying weight. It works perfectly. What I do is just shorten one of the tripod legs and stick it in that holster. the weight is then evenly distributed on my hips and shoulders. It also creates a fairly steady shooting platform by simply setting the front legs on the ground, and I act as the third leg with the short leg still in the holster.
Anyway, here are a few images from today with the 600mm f/4 and 1DsMII. I know Loupey realizes how hard it is to get an Eastern Meadowlark to pose like this, so I wanted to include a few of this fellow for him to enjoy:
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