Category: catadioptric
A catadioptric lens uses mirrors instead of refracting lenses. I use a Sigma 600mm lens. My favorite description of catadioptric lenses is 'a great lens that takes terrible photos.' I try my best to counter that description, but it's pretty true. The light bounces around inside the lens causing a loss of contrast, but it's a fun lens to use.3
Early Bird Special
Recognize this lens? The effect of a long telephoto like this is a lot of fun. Especially when your circle of confusion has a hole in it! Extra credit if you have any idea what I just said...1
Great Blue Heron Fishing
Fighting against the oncoming twilight and a 600mm f/8 lens, I managed to capture a Great Blue Heron catch a fish on Lake of the Isles.4
Blue Crow at a Distance
Remember the 500mm Mirror Lens I had back in May? In spite of the horrid bokeh, I couldn't stop thinking about it. I broke down and found another one on ebay. After months of researching mirror lenses I settled in on the Sigma 600mm. This one is bigger, and on a DSLR it has an effective power of 18x. What led me to this one was the thought that what mattered was the size of the objective lens (the exposed glass on the front of the lens) which on the Sigma 600mm is 95mm. Anyhow, the stupid doughnut machine is back. It's so much fun to use, it's like the best binoculars that takes pictures and doesn't weigh a ton. The trick is to find things with plain backgrounds.5
Grasshopper
What can you do with a 500mm lens? I found this guy standing on the foot path around Purgatory Creek in Eden Prairie and just had to take his picture. I hope he's as happy with it as I am.10
Paddling While Distracted
Can you hear me now? Ploop, uh oh. People are the truly most fascinating subjects.2
Yellow-rumped Warbler, Dendroica coronata
I just love these guys, they are so cheerful and cute. My friend Karen pointed out that warblers hop around a lot and it's true. They can be very frustrating with a long lens (focused, theres that branch... now where did he go?). One of the fun things about photographing all the birds with a big lens is that you realize the amazing diversity of birds. They were all sparrows, crows and robins to me before I started shooting. I never noticed these guys before. I still don't recognized them with the naked eye, the lens let's me identify them — though I am getting to know their chirp.2
Barn Swallow, Hirundo rustica
This little buckarooo was gathering mud along the path on Lake of the isles to build a nest. Low morning sun is great for photographing birds, the low sun allows for capturing the iridescent quality of their feathers.8




