michgirl wrote in post #16540193
I am surprised to hear you say this - I am almost 60 years old, female with Rheumatoid Arthritis and only hand hold this lens. I am very pleased with the results, extremely pleased. This is a lens that loves lots of light. Normally when I am shooting birds, I use Bryan Peterson's "Rule of 16" - set the aperture to 16, and have SS speed and ISO the same.
Well, you're still a youngster, no wonder you hand-hold it ...
I'm not so sure it's 'shake' so much as distance - on the 100-400, I shoot with the long-end usually, so that's a factor in sharp/soft criteria ... maybe, my tech self can't answer that. On the short end, it's very sharp.
I do notice tho, the 70-200 seems sharper at 200 than the 400 is at 400?? But, have only had this 70-200 a week ... and am still playing with it. The 1.4x on the 70-200 sure works well tho. Then again, at the 200 and 400 ends, that's stretching the equipment too. I'd guess, not positive, that most zoom lenses work better in the middle ranges than at both ends. Seems true anyway.