Three ballerinas lost in a studio, the fourth missing (school holidays I guess). On the other hand, we're having the first springtime-like day here. No pressure, no stress. At work : the Df + 24-70/2.8 (the old one), which is a must-have under such circumstances, given its fast AF. I wish the range were reaching 105 to 120, but f/2.8 is too useful to be ignored (either when speed is needed, or for the sheer pleasure of subject isolation). Better be limited to 70 and crop every now and then. Here I used the 2.8-5.6 range.
On the downside, the AF zone of the Df is really ridiculously small for such circumstances. Ballerinas often dance in pairs (a.k.a. duets) , and that's the trouble.
By the way I tested the Sigma 204-105/4 VR yesterday : excellent, on fixed subjets at least. More about that in another thread.