On 20 Mar 2006 at 20:53, Jostein wrote:
> Gang, > > Just an observation from prolonged camera exposure to temperatures > around -150C, 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.
That anything would work at -150C is amazing in itself. Butch
