Hi,
Herb Chong wrote:
the February Popular Photography "Your Best Shot" column reproduces a USAF photo of a pilot ejecting from his F-16 as the plane was coming straight at the photographer. the camera locked onto the front of the airplane as it flew directly toward and then crashed to a stop about 100 feet from the photographer. it allowed him to take an in-focus image as it moved. the article captions says that the camera was a Nikon D1X, not noted for its AF speed, on a 300/2.8. figure the aircraft was travelling a couple of hundred miles an hour. http://www.rapp.org/archives/2004/01/thunderbird_crash/
Not a very good example at all. The photographer was almost certainly expecting the plane to be there (though maybe not doing _that_) and there is also a luck factor involved. There is also the good old English word "bollocks" to consider.
In any case, I suspect Jens is saying that "locking on" in (autofocus) photography is not the same as "locking on" using guided weaponry. In other words, the weaponry will stay "locked on" to its target unless drastic countermeasures are undertaken. Cameras will change focus if the photographer breathes.
mike
Herb....
----- Original Message ----- From: "Jens Bladt" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Wednesday, January 12, 2005 2:19 AM
Subject: RE: *istD AF performance (was Re: Sigma 2.8 Zoom lens comments)
Cameras cannot lock on to anything. Like an electronic weapon system in an F18-Hornet. I wish it could. It can only focus on a subject/distance. Then perhaps refocus on annother subject/distance.
