Seth Richter
December 17th, 2003, 11:26 AM
I was wonder how to extend the focal length without paying for it royally. I know there is a wide angle adapter, which would change the length, but, not by much.. Anyone have any ideas?
View Full Version : gl2 "shallow focus" Seth Richter December 17th, 2003, 11:26 AM I was wonder how to extend the focal length without paying for it royally. I know there is a wide angle adapter, which would change the length, but, not by much.. Anyone have any ideas? Ken Tanaka December 17th, 2003, 11:41 AM Your question is confusing. It's titled "shallow focus", which is a depth-of-field matter. But then you ask about changing the "focal length", which is often a matter concerning a lens' telephoto properties. Then you ask about a wide-angle adapter. Can you clarify what you want to accomplish? Do you want to get a wider field of view or do you want to see birds' eyebrows from 1000 yards? Seth Richter December 17th, 2003, 11:44 AM Sorry I meant "Shallow DOF" Ken Tanaka December 17th, 2003, 11:54 AM OK. Please do a Search on DOF, as this has been discussed literally hundreds of times. We have a very large body of typing on the subject. Jeff Donald has also written an extensive article here (http://www.dvinfo.net/articles/optics/dofskinny.php) on the subject. Bottom line: With 1/4' ccds you're very limited. Back-up, zoom-in, open your iris as wide as possible. That's the story. Has nothing to do with adapters. Seth Richter December 17th, 2003, 12:02 PM Thanks, I have been trying to research it, but, after a few hours of trying to find any telephoto-type lenses that were cheep for the gl2, I decided to try and cut the middle man. |