Some of you know from the photo images in my earlier posts here that I have a good copy of the lens. It has been a delight to use this lens so far. However, when I ran into a mommy bear and its two cubs in my just completed trip to the Rocky Mountain NP turned into a big, first disappointment with the lens. All the years that I had visited the park, this was the first time ever that I saw a bear and not just a bear but with its cubs in tow. I was really excited, but it quickly turned sour upon reviewing the results. Here is a sample photo with exif info:
I always shoot RAW and my 5DIII allows me much confidence shooting in high ISO with great PP results, but this photo and all the rest of bear shots were really challenging in PP. Thinking that perhaps 1/250 sec was too slow (shot everything on my monopod) for the lens even for the stationary cub, I raised the SS to 1/500 sec by bumping the ISO. The results were the same. You can see how much I had to apply noise reduction here.
Here's then another image that I shot the other day. I was really excited to find this lone elk in the pond when it gave me the drama I needed when it started suddenly to charge at the ducks. It was shot from a distance but not enough to rely all that much cropping afterward.
With this photo, ISO had no impact on the IQ since it's low enough. I don't think SS was a factor, either, since, although charging, the speed of the elk was pretty slow.
I want to know whether it's the user error OR the lighting condition played a role, the first in the shadow, wooded area that forced me to shoot in high ISO and the second with too much mid-day light. Two great rare opportunities gone up in smoke. Very disappointing. Your thoughts on the cause? User error (remember, the bear shots were later raised to 1/500 sec on relatively stationary subjects) or the nature of the lens in certain lighting condition?