petersant Posted August 13, 2021 Share Posted August 13, 2021 Hi All, I'm about to start a S16mm production shooting on Arri SR2 and done steady tests for each mag (x2). both have come back from the lab. The tests were shot double exposed, offsetting the steady test chart slightly between. Both tests have a slight weave where the steady test chart grid is stable in the frame, however, the entire frame and its contents are weaving slightly. My question is how do you differentiate between camera weave and telecine weave? Any help greatly appreciated. Link to comment Share on other sites More sharing options...
Premium Member Dom Jaeger Posted August 13, 2021 Premium Member Share Posted August 13, 2021 When you view a double exposure steady test, the only thing you want to look at is whether the two grids from each exposure are locked together. If there is any camera unsteadiness, the grids will move relative to each other. Don’t pay any attention to whether the entire frame is moving, only look at the two grids and whether there is any movement between them. If the grids seem locked together, the camera registration is steady and you’re good to go. 2 Link to comment Share on other sites More sharing options...
petersant Posted August 13, 2021 Author Share Posted August 13, 2021 Thanks Dom Link to comment Share on other sites More sharing options...
Premium Member Dimitrios Koukas Posted August 13, 2021 Premium Member Share Posted August 13, 2021 It has been a long time since I did this... But you re saying that you have slightly offset the grid in second exposure run? Or it is my bad English maybe. Link to comment Share on other sites More sharing options...
Premium Member David Sekanina Posted August 13, 2021 Premium Member Share Posted August 13, 2021 Instead of a grid, you could shoot a fine dot pattern once, rewind, rotate it slightly a shoot it a second time. the result will be a moire pattern, and the moire will move if the camera is not steady, and can be distinguished better from the scanner's gate weave. I have never tested this though - but will give it a try one of these days. Link to comment Share on other sites More sharing options...
Robino Jones Posted August 13, 2021 Share Posted August 13, 2021 Ask for an overscan so you can see the film perforations, if the perfs move with the grid then it's the telecine / scanner and if they are super steady then it's your camera. 1 Link to comment Share on other sites More sharing options...
Robino Jones Posted August 13, 2021 Share Posted August 13, 2021 Here's a hand processed reg test I did with my CP16 with old expired plus-X film. pass: cp16 1 Link to comment Share on other sites More sharing options...
petersant Posted August 14, 2021 Author Share Posted August 14, 2021 10 hours ago, Robino Jones said: Ask for an overscan so you can see the film perforations, if the perfs move with the grid then it's the telecine / scanner and if they are super steady then it's your camera. Perfect. Makes sense. Thanks Robino Link to comment Share on other sites More sharing options...
Site Sponsor Robert Houllahan Posted August 16, 2021 Site Sponsor Share Posted August 16, 2021 I always do an overscan for registration tests and on the Scan Station or Xena which have machine vision optical perf registration so the scan will be rock solid locked to the perfs. Best practice IMO. Link to comment Share on other sites More sharing options...
Carl Looper Posted October 7, 2021 Share Posted October 7, 2021 In terms of weave, 16mm film is edge aligned in the camera. Not perf aligned. So any scanners that align 16mm film, using the perfs for registration, will exhibit weave, due to a certain amount of weave in the film stock perfs (relative to the edge of the film). Carl 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