I dropped by Critter lake armed with only my 1D3 with the 100-400 lens and a 1.4x TC on a monopod -- in other words, abot 560mm.

The light was getting low this afternoon. I started out at say ISO 1600 but ended up at ISO 3200, meaning that there was noise in the images, but my main concern was just getting good shots. However, it was a battle because with that combo I had to use a narrow aperture and my shutter speeds were very slow! Oh well, I squeezed out a few!

At the end as I was heading back to the car a train went by and I used the same gear to catch some panning shots which was fun!