I lay flat on my stomach for an hour watching this guy catch his lunch during a workshop/getaway in and around Hoedspruit, Limpopo, South Africa. Used a Sigma 100-300mm f/4 APO EX DG APO HSM full-frame non-stabilised lens on the D90 (Sadly it is discontinued by Sigma as they have replaced it with a 120-300mm f/2.8 and I’m counting pennies ;p ) This gives me the effective range of 150-450mm on the DX small-frame sensor of the D90 (remember the D90 has exactly the same sensor as the D300s). Distance to subject about 180 cm / 70.9″ right at the cusp of closest focus. A “kit” 70-300mm f/4.5-5.6 would also work as long as it’s the DG (full frame) that has that extra reach, and not the DC 18-250mm version. I shot a lot of my early work with 70-300mm f/slows and they are very versatile. A 55-200mm VR or any equivalent new 70-300mm VR DX/OS DC lens will work, but you have to get closer and often these subjects have a personal space of a few meters.
Note the low POV. Critical in getting more powerful images. I wished more people would do that with their online pet images on social media!
The lizard polished off at least half a dozen insects and larvae in one hour. They are so fast that by the time he’s scampered to catch the fallen insect he’s half swallowed it already before you get a shot. You have to be spot on with focus and constantly alert. Shutter priority is the way to go and once you have mastered that go aperture priority but keep an eye on the shutter speed. At least double the speed of the maximum focal length of your lens to get a sharp unblurred image. In my case that would be 1/1000th (300mm full frame lens x 1.5x crop factor = 450mm x 2 = 900). A bean bag is handy as this big lens weighs 1480 g / 52.2 oz, and gets harder to hold as time goes by, however the POV is then slightly higher and perhaps not as powerful a shot.
ETA 2012/01/19: ID just in! Thanks to to Trevor from Hardaker.co.za Common Flat Lizard (Platysaurus intermedius) Possibly male.
Watching him snack bugs reminded me of The Crunchy Frog sketch by Monty Python: