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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Focus issues during shooting!

Joshua Hoareau

Joshua Hoareau

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Melbourne, AU
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www.cinestudios.com.au
Hey all. So today I was shooting a short film on my Epic. While doing the focus pulls during our test runs everything was fine, but when we hit record for some reason the focus pulls began to fail and the focus remained stationary. After several tests we found it to only happen while recording. Without recording the lens would pull fine. Was using a Canon 24-70mm L-series. Any ideas on what the problem was?
 
What type of pulls were you doing? Touch track, or rack?
 
Auto focus with software focus or manual?

Is your lens seated firmly? Canon mount? Is the lock ring tight?
 
Sorry should have put more details. Rack focus. Manual focus. Len's was connected firmly. Took it off several times to check. Canon mount. Lock was tight. And worked fine when I wasn't recording. Only once I hit record it began to screw up :S
 
Which firmware version?

"...Rack Focus. Manual focus." - were you using the firmware's rack mode?
 
Were you pressing record with the side handle? I've had this happen to me when not pressing the record button all the way down the camera will re-focus
 
You've probably tried this but try and disable auto focus in the camera. If that doesn't work you could try not seating the lens all the way and see what happens. The theory there is that if it is the cam the lens won't be touching the lens contacts.
 
I don't have a side handle. I was using the ON switch on the right hand side of camera. Yeah I tried that. Removed the lens several times, turned auto focus on and off, went through a few focus settings, but it kept happening. It's just weird that it only happened when I hit record.
 
If you are still able to reproduce the problem, please reproduce it, save a log and send it in.
 
Open a support ticket for this issue and someone should get back to you with info on where to send it.

Joshua Hoareau said:
So I did a shoot today and it did it again. I saved the log file, but not sure how to access it to post it up here. Any suggestion on how I do that?
Click to expand...
 
As an alternative, did you try using the button on the front of the camera/SSD module for stop/start?
 
I wonder if there is a voltage thing happening when record is triggered and more power used in the buffering and write process, just enough to misinform and set off the focus controller if voltage sensing is what makes it work? I imagine the log will tell the truths which need to be known versus my wild theorising.
 
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