A couple more shots from the 08 Petite Le Mans that are 1/500, f5.6, 100mm. On a 1.6 fov camera, 100mm will equal 160mm. Even with IS, if you shoot 400mm at much less than 1/250, your keeper rate will decrease. I was shooting at a higher ISO to keep shutter speed a little higher for a sharper image.I was close enough that much more than 150mm would have been way too muchI was shooting in Av mode and setting aperture and ISO to get shutter speed. At the beginning of the year (08) I had the 28-135 kit lens and was told by a "PRO" that I should increase ISO for faster shutter speed to increase sharpness, because the Canon EOS cameras signal to noise ratio is very high. This is true. You can shoot at ISO 800 and see very little noise. I increased sharpness and shutter speedat ISO 500. Later Iwent to a 5D full frame,and I nowshoot center focal point in Center-weighted Average Metering in AI-Servo. For bikes and spoke blur you pretty much need 1/250 or less (ISO 100-125).I now shoot some sharp (1/1600 to 1/8000) and adjust ISO down to 125 for blur on others. I still like Av mode so I can control my background blur (constant F stop) you don't get with Tv mode.Also on the 30D I use +5/3 steps exposure compensation because my images were too dark. Yours may be different. I was maybe 30 ft. away and the first image had a little Straighten tool (kind of like crop), and the second image just some standard blacks,fill light, sharpening, contrast in RAW, then conversion to sRGB and Unsharp mask (80%) in P.S. Elements 7, (much easier to use than CS versions).


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