radman 0 Posted January 19, 2008 Hi all I got the Chinese Dome PTZ board talking to the Geovision software ok but what is the correct way to set up a zoom lens with a Panasonic WV-CP484E, I can get the lens to focus ok but I have to set up the ABF manualy is this correct? if I go auto ABF there is no way I can focus the lens! is there a correct procedure? Thanks, John. Share this post Link to post Share on other sites
CameraGimp 0 Posted January 20, 2008 It is quite late with me and I've just logged in between the pub and bed so I may be off with this one...but Are you looking for a procedure on how to set back focus on a camera fitted with a zoom lens? If so try this Set the lens focus to infinity and fully open the iris by covering the lens with a suitable neutral density (ND) filter. Zoom out to the widest field of vision and view a distant object. Adjust the back focus until the object is in focus. Next, zoom fully in and adjust the lenses focus until the object is again focused. Repeat these steps until the full zoom range may be viewed with the minimum loss of focus. The last sentence seems a bit vague but then I'm slightly drunk! Share this post Link to post Share on other sites
radman 0 Posted January 20, 2008 It is quite late with me and I've just logged in between the pub and bed so I may be off with this one...but Are you looking for a procedure on how to set back focus on a camera fitted with a zoom lens? If so try this Set the lens focus to infinity and fully open the iris by covering the lens with a suitable neutral density (ND) filter. Zoom out to the widest field of vision and view a distant object. Adjust the back focus until the object is in focus. Next, zoom fully in and adjust the lenses focus until the object is again focused. Repeat these steps until the full zoom range may be viewed with the minimum loss of focus. The last sentence seems a bit vague but then I'm slightly drunk! Well Drunk or not I will give it a try thanks for the help, if in the sober light of day you can read your post and add anthing it will be appreciated John. Share this post Link to post Share on other sites
survtech 0 Posted January 20, 2008 If you don't have a neutral density filter, a piece of # 5 welding glass will work. The key is to adjust the back focus with the iris fully open. Share this post Link to post Share on other sites
radman 0 Posted January 20, 2008 Hi welding glass I have so that is good to open the iris fully do I turn the level pot to high? thanks, John. Share this post Link to post Share on other sites
rory 0 Posted January 20, 2008 thats really if it is to be used for day night apps or as you have, a Zoom lens. If you have none of those focus it under low light like in early evening (or in a room where you can control the lighting), whatever you do, never focus it in full sunlight. If it has IR then the BW mode must be focused in the pitch dark with the IR on. Ive never used either the ND filter nor welders glass and always was able get a great 24/7 focus. Ofcourse your Chinese PTZ may be tricky. Share this post Link to post Share on other sites
radman 0 Posted January 20, 2008 I will try all methods to see what works best but do I need to turn the lens sens to max? The Chinese PTZ board seems to work fine Rory I have a few spare switching functions! 4 relay and an Iris one must be able to do something with one of those?? Thanks, John. Share this post Link to post Share on other sites
survtech 0 Posted January 21, 2008 If you have an auto-iris lens, you should not have to adjust any controls. Just use the welding glass and the iris will fully open automatically. Share this post Link to post Share on other sites
radman 0 Posted January 21, 2008 Got a good result thanks to all for the help, John. Share this post Link to post Share on other sites
