Thirded. I can tell you from experience that this combination works. This is my go-to wedding setup: 17-55, 85/1.8 and two 550EXs. If you need more reach then get a 70-200/2.8 IS to complement the 17-55.bholliman said:neuroanatomist said:In your place, I think I would go with the Canon 17-55mm f/2.8 IS. Personally, I think it is the best general purpose zoom lens for a crop body. It also works very well combined with a fast telephoto prime, such as the 85/1.8, which makes a very nice portrait lens on a crop body.
ecka said:You still need a fast enough shutter speed to get a nice and sharp photograph. My advice would be EF 85/1.8 USM, which is a fast focusing, sharp at 1.8, very affordable and overall decent lens for what you want it to do.
Random Orbits said:In your case, I think a flash would be more helpful. You can then use your current lenses and drag the shutter. The flash will help freeze the subject while the longer exposure time will allow the background to be exposed properly.
I agree with these 3 suggestions. If this were me, I would start with a 17-55 2.8 and then add a 85 1.8 if I needed more reach. Adding a good speedlite or two is always a good idea as well and can be used to expand your creative possibilities beyond what you can do with just fast lenses and natural light.
If shake and trembling is an issue, consider using a monopod.
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