skydiveoc 0 #1 July 25, 2005 PC 109 did it...PC 1000 doing it too. On opening, usually harder ones, focus goes way out then back in. Any clues? Quote Share this post Link to post Share on other sites
ltdiver 3 #2 July 25, 2005 1) You have it on auto focus or 2) The Floating Iris problem ltdiver Don't tell me the sky's the limit when there are footprints on the moon Quote Share this post Link to post Share on other sites
quade 4 #3 July 25, 2005 Quote1) You have it on auto focus or 2) The Floating Iris problem ltdiver Expanding on that a bit... Auto-focus is generally not a great idea since the camera can have a tendency to "hunt" for the right focus. In focus sometimes, looking for focus the others. A bit better, especially for video, is simply to manually set focus to infinity and leave it there. If you have a wide angle lens then setting focus this way is almost never going to be an issue with video. The other issue Lori mentioned was, in my opinion, misnamed. There are two types of lens mounting in most modern consumer cameras; a mechanical mounting and a magnetic mounting. The mechanical mounting has the lens in basically a screw type of device, the position of which determines the focus of the image. This is the most basic arrangement and is common in most types of cameras including still cameras. The magnetic mounting has the lens attached to a small magnet. It "floats" inside a tube which is also a small electromagnet. To focus the lens the camera creates an electomagnetic field which positions the lens within the tube. All one need do to determine which type your camera has is to turn it off and rock the camera from front to back. If the lens is magnetic, you'll feel and sometimes even hear the lens sliding inside the tube since there is no magnetic field to hold it in place. During opening shock the mechanically mounted lenses hold focus quite well, however, the magnetically mounted ones tend to not hold focus at all since they were never designed to take that much G-force and the magnetic field is actually quite weak.quade - The World's Most Boring Skydiver Quote Share this post Link to post Share on other sites
DaGimp 0 #4 July 25, 2005 Quotemanually set focus to infinity Even this can not be entirely true in all instances Paul.....i agree...manually set your focus.....but with some lenses, like mine....royal lens .5...infinity makes the image look out of focus.......i would say play with the focus until you find the sharpest image."Professor of Pimpology"~~~Bolas Quote Share this post Link to post Share on other sites
quade 4 #5 July 26, 2005 OK, ya got me there, but those small single-piece wide angle lenses like the Royal are not really "normal" wide angle lenses either. They're special instances.quade - The World's Most Boring Skydiver Quote Share this post Link to post Share on other sites
ltdiver 3 #6 July 26, 2005 QuoteThe other issue Lori mentioned was, in my opinion, misnamed. I completely agree. However, when I called it something else in another thread (months ago) all the others seemed to latch onto the "Floating Iris" name. So, I called it what most others seem to identify with. Oh well. QuoteExpanding on that a bit... And I thought that men were short winded and women liked to expound upon the message..... j/k ltdiver Don't tell me the sky's the limit when there are footprints on the moon Quote Share this post Link to post Share on other sites
skydiveoc 0 #7 July 26, 2005 Thanks for the replies guys, tis the magnetic iris since i have quite a bit of experience with the camera and know how to set the focus etc, but it is only a symptom with a pc 109 and 1000. I also edit for the dz so I see lots of camera images in front of me. Quote Share this post Link to post Share on other sites
