
Originally Posted by
zagnut
One thing I forgot to mention earlier tonight. Earlier this evening, I went to a play that my daughter was in. It was in an auditorium and the lighting changed from scene to scene. I had to use my 55-250IS for photo's. Well, as much as I like that lens for it's outstanding value as a first zoom telephoto, it fell on it's face pretty hard in the dim light. I was shooting at ISO 1600 with shutter speeds anywhere from 1/4 to 1/25 at f/5.6...handheld, with the EV all cranked all the way. I can usually get a few decent keepers between 1/15-1/30. However, the keeper rate tanked at anything lower than 1/15. Even with the ISO and EV cranked, the IS and focus struggled.
My point is, this just goes to show the importance of a semi-fast (f/2.8) or faster lens for these situations. This was the first time I've used my tele in poor lighting conditions like this. Because of this, my planned upgrades have changed and I'll be saving for the Sigma 70-200/2.8 HSM OS and a 1.4x TC.. Sure the Canon 70-200/2.8L MkII is a little better lens, but the cost is prohibitive at about twice as much as the Sigma.
Really wanted to go with the 18-200IS. Since a lot of that range will be covered by the Sigma, I'll be reconsidering the 15-85IS and looking at both the Tamron 17-50/2.8 VC and the Sigma 17-50/2.8 OS, as well as the Sigma 17-70/2.8-4 OS. It will be a while before I save the money for any of these, so I have plenty of time to research the Tammy and Siggy's. I've already done my homework on the 15-85IS and Sig 70-200/2.8 and have been very pleased with all I've read about both of these. After being bitten by the lower light capabilities of a f/2.8 lens (thanks to my Yashinon 28/2.8), it's going to be a tough choice for what to choose for the wide end. I wish there was something like a 15-85/2.8.