Hi all, Been lurking here for a while, nice to post for a change.
This morning, I've been out in the back garden taking some test shots with a new Sigma 15-30 f/3.5-4.5 EX fitted to my Z-1, and I've come across some interesting AF behaviour that I've not noticed before. Testing at 15mm, I noticed that the AF wasn't focusing precisely on the subject - it was focusing a few feet in front. I played for a few minutes, with the camera on a tripod pointing towards the house about 12 feet away, and concluded that the position of focus varied with the aperture set. Wide open, the focus was accurate. As I stopped down, the point of focus moved towards the camera. Presumably, the camera was making a judgement on where to focus in order to maximise depth of field whilst keeping the subject sharp. I got the same result regardless of whether I changed the aperture via the ring or the body. The Z-1 is set to use the standard program line, not the DOF variant. I've not noticed this before and haven't seen it discussed - can anybody shed any light? Graham -- [EMAIL PROTECTED] - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
