weiming Posted May 21, 2006 Share Posted May 21, 2006 Hi, according to the SR3 pdf manual: 'with the new pitch adjustment you can adjust the camera to optimise the running noise level when different types of film stock are used.' what does adjusting the pitch physically change, that reduces the running noise level? does using different film stocks in the SR3 create diferent noises/ noise levels? Anybody have any idea? thanks:) weiming. Link to comment Share on other sites More sharing options...
Premium Member Adam Frisch FSF Posted May 21, 2006 Premium Member Share Posted May 21, 2006 Basically how far in the pulldown claw grabs the sprocket. Link to comment Share on other sites More sharing options...
Annie Wengenroth Posted May 21, 2006 Share Posted May 21, 2006 Actually, it's the angle (the pitch!) of the claw, not necessarily the depth. Because some stock might have a slight difference in the size or positioning of its perfs, you can adjust the pitch to compensate for this and reduce any noise that might occur as a result of the edge of the perf hitting the claw at an odd angle. </geek> I hope that helps. :-D Link to comment Share on other sites More sharing options...
Daniel Stigler Posted May 21, 2006 Share Posted May 21, 2006 does using different film stocks in the SR3 create diferent noises/ noise levels? Black&White stock is thinner than color stock, because it has less layers and that causes the camera to run a little noisier. Link to comment Share on other sites More sharing options...
Premium Member Stephen Williams Posted May 21, 2006 Premium Member Share Posted May 21, 2006 Hi, according to the SR3 pdf manual: 'with the new pitch adjustment you can adjust the camera to optimise the running noise level when different types of film stock are used.' what does adjusting the pitch physically change, that reduces the running noise level? does using different film stocks in the SR3 create diferent noises/ noise levels? Anybody have any idea? thanks:) weiming. Hi, FWIW the size of the perfs change as the cutter wears! Perfs cut at the start will be fractionally oversize and when the cutter is worn the perfs will be slightly undersize. The width of film also changes as I discovered in 1983 when some film kept jamming in the advance sprocket of an animation camera I owned. I had run about 250 400' rolls of stock with that camera. As the cutters wore the film got too wide! Stephen Link to comment Share on other sites More sharing options...
Premium Member Chris Keth Posted May 22, 2006 Premium Member Share Posted May 22, 2006 Actually, it's the angle (the pitch!) of the claw, not necessarily the depth. Because some stock might have a slight difference in the size or positioning of its perfs, you can adjust the pitch to compensate for this and reduce any noise that might occur as a result of the edge of the perf hitting the claw at an odd angle. </geek> I hope that helps. :-D Ding ding ding, we have a winner! There are a bunch of things that can cause raw stock to change size very slightly. Temperature, humidity, when in the run your roll was cut all affect the size and spacing of the perfs. The pitch adjustment is to help the camera run the quietest it can possibly run by adjusting for these minute changes in raw stock. Link to comment Share on other sites More sharing options...
weiming Posted May 28, 2006 Author Share Posted May 28, 2006 okok i understand clearly now. Thanks all for replying. hmm, but something just occured to me. won't that mean that u have to roll the camera with film stock inside before u could adjust the pitch? in the process u could lose about 5-10secs of film, depending on how long u take to adjust... guess it's supposed to be done sparingly. Link to comment Share on other sites More sharing options...
Premium Member Stephen Williams Posted May 28, 2006 Premium Member Share Posted May 28, 2006 okok i understand clearly now. Thanks all for replying. hmm, but something just occured to me. won't that mean that u have to roll the camera with film stock inside before u could adjust the pitch? in the process u could lose about 5-10secs of film, depending on how long u take to adjust... guess it's supposed to be done sparingly. Hi, You do have to run the camera to adjust for the pitch! Stephen Link to comment Share on other sites More sharing options...
Premium Member Brad Grimmett Posted May 28, 2006 Premium Member Share Posted May 28, 2006 hmm, but something just occured to me. won't that mean that u have to roll the camera with film stock inside before u could adjust the pitch? in the process u could lose about 5-10secs of film, depending on how long u take to adjust... guess it's supposed to be done sparingly. You can do it in prep with a dummy roll, but when you're on set and you adjust it you're going to have to waste a little film. Link to comment Share on other sites More sharing options...
Premium Member Laurent Andrieux Posted May 30, 2006 Premium Member Share Posted May 30, 2006 Note that when someone has perf related problems, one should check that they were properly manufactured... Sometimes, they are not just in a line and not at the good edge distance. If you take a 2' length of film, fold it in 2 as to superpose the 2 1' lengths and check the perfs are perfectly at the same position... THat happened to me with Fuji stock. It causes a bad registration pin test. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now