Great lens - super combination...
Congratulations on your new 70-200mm f/4L IS lens. The lens is spectacular and the combination of this lens and the 17-55mm f/2.8 IS lens is (IMO) the absolute best two lens combination out there for general and travel photography.
I use my 70-200mm f/4L IS 3-4x more often than I was ever able to use the non-IS f/L model. The IS capability is great! I can shoot down to 1/60 second with 100% sharp imagery and at 1/30 second with a very respectable percentage of keepers. This is at 200mm hand held.
BTW, the 70-200mm f/4L IS lens does a great job using a 1.4x TC as a 280mm f/5.6 lens with IS.
I use these two lenses on a pair of bodies (30D AND 40D) and I effectively have a focal range from 17-200mm (280mm with the TC) with optimum image quality and top-notch A/F speed. I don't miss the 55mm to 70mm gap at all.
I used to carry a 3-lens combination (12-24mm Tokina, 24-70L and the 70-200mm f/4L IS) however, the 17-55mm takes the place of both the 12-24mm and the 24-70L in many instances. When I need wider, I can usually shoot a pano. I can get decent single string panos hand held. (see image)
The 17-55mm f/2.8 IS lens lets me shoot as slow as 1/10 second hand held with a goodly perentage of keepers at 55mm. This lens is a great low light glass.
YOU HAVE A GREAT COMBINATION - BEST OF LUCK WITH THEM!
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