Originally posted by reeftool Yes, if you're looking to do a lot of wildlife, the DA 300/4 would do better just because you will need the f/4. Wildlife tend to be more active in early morning and late in the day, near the sunrise and sunset. Lower light will require the faster lens although the high ISO capability of the newer sensors will get you better results with a lens like the 55-300. It's not impossible. There are a lot of very fine bird and wildlife shots posted through the forum with the 55-300. I do my wildlife shooting these days with a manual focus 300/4. It actually works out better because much of the time, I would end up having to manually focus anyhow because of branches, high grass and other stuff that would make the AF go crazy.
Another advantage the DA 300/4 and 60-250 have is noise. They are silent. Critters can hear a screw drive lens (and shutters) from a long way off. I took a photo of several white tail deer in a field with a Sigma 70-300 on my K10D several years ago. It was really a landscape shot with deer rather than a wildlife shot and I was at least 1/4 mile away. They lifted their heads up the second the lens focused and looked right at me. I only got one chance because they took off.
Once on a guided tour I was asked to turn off my camera. I was trying to get images of birds landing on people's hands for a bit of bird seed, but the screw drive was frightening the birds and ruining everyone's pictures. It can happen.
Despite the weight, I am seriously considering 2.8 glass for wildlife, I'd love to have a 300 2.8, but even the old ones are way too expensive, so I'm considering the DA* 200 2.8 for use with the 1.4 and 1.7 converters which I already own. I've taken large wildlife images with my DA-18-135, so I'm really not concerned about the lack of reach...but I want wildlife shots with atmoshere, mist rising off the rivers in the morning, sunset light in the evening... those are typically low light situations, and I've had problems with ƒ4 in the past. It affects the shutter speed, but also the function of the Auto Focus. Whether I go heavy and get the Tamron 70-200 or wait for the new Pentax 70-200, or go for the DA*200 2.8, I'm not seeing a way around this. These opportunities come around too rarely to miss one because of an ƒ4 lens.
A buddy took a great moose shot a number of years ago with a Canon 70-200 2.8 and a full frame. I should be able to get that image with a 50-135 on APS-c, have the same shutter speed and more DoF. So maybe the 200 2.8 is overkill. For some reason, I find it more appealing. With the 1.4 TC it's 280 and ƒ4. Not much different than 300ƒ4.