Before IS was invented, I was younger, had a steadier stance and used my tripod. Now I'm in my mid-60s, much less steady, still use my tripod and all my zooms have IS. Life is good.
About 2 months ago, I went to a dimly lit koto concert with my 17-55/2.8 IS and 135/2.0. SInce I wanted to move around, I "sat" along the back row. The 17-55 was too short, so I used the 135mm, ISO 1600 and 1/30-1/60.
I used every trick I could think of to steady myself: Leaning against the back wall, sitting on the stairs forming a "tripod" with my body and two arms leaning on my knees. I got less than half of the shots in focus.
Surely focus has nothing to do with holding the camera steady?



. And that medium format stuff was NOT cheap.
