Cold weather performance of DA 16-45/4

[Jostein]

Gang,

Just an observation from prolonged camera exposure to temperatures 
around -15°C, in windy conditions. The clutch focus mechanism becomes 
too tight, so that the AF motor in the *istD hardly manage to drive 
it. Just to check that it was not the batteries acting up, I changed 
to FA*400/5.6 and Sigma EX 70-200/2.8. The AF responded swiftly and 
without problems with both lenses. Considering that I've never had to 
touch up the focus manually while working with AF, the clutch-focus 
mechanism is suddenly a feature I wish I didn't have.

Jostein