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thank you for all the help and information...man it is so hard to decide..but am I understanding that the off brands do not work as well in low light as a nikon would? I really need a great lens for the ceremony and reception. but I think it would be much easier to hold a lens than use a mono pod or tripod....does it take alot of practice to hold the 70-200 by hand? maybe I should try out the 24-70 before I purchase the 70-200.....I really want great bokeh as well though!
I hand held my 70-200 2.8 for over 3 hours shooting a football game, the first day I had it. It gets a little heavy after a while but it is VERY doable.
Photo from that game:
*Sigma 70-200 2.8, non OS, handheld. Nikon D40. (exif data: 70mm, f2.8, 1/200th, iso 1600)
As long as there is enough light to keep your shutter speed greater than the focal length of the lens (ex. - at 200mm (add in 1.5x crop factor =300mm) you need at least 1/300th of a second to avoid blur from hand holding)
If its dimmer you need a monopod, dimmer yet and you need a tripod.
Canon 24-70mm f2.8 followed by
Sigma 120-300mm f2.8 which is huge:
What is your favorite lens?