Abstract of snow geese from Bosque del Apache NWR.

At Bosque yesterday morning, I shot lots of normal, sharp images of snow geese and then decided to try and slow the shutter down and get abstract.  To do that, I needed a slow shutter speed, and I wanted to the geese to fill the frame.

So there is what I did.

I took my 200-400 mm lens, shot at 400mm, added the built in 1.4x teleconverter, and then stacked a 2x teleconverter to give me a full 1120mm focal length.  It would be tough to get sharp shots with that combination, but for abstract, who cares! And when you add teleconverters, you also increase your maximum aperture (i.e. how small you can close or “stop down” the lens).

So with a slow ISO of 50 and an aperture of f/91 (yes – f/91), I managed to slow the shutter down to 1.6 seconds.

The moving geese did the rest.


Canon 1DX. 112omm.  ISO 50.  f/91 @ 1.6 seconds. +2/3 EV