CarlMiller

ASPECT RATIO/CROP GUIDES PLEASE! That's gotta be a super easy feature to implement. 

​Ya, nothing was blocked after all. 

All that is known is 1. One individual has a new firmware on their camera (there are many buying Mark III's at the moment who aren't getting it), and 2. It doesn't allow roll-back. Additionally, since it references TWO unheard of firmware versions (1.3.0 AND 1.3.3), I'm inclined to think this individual might have received a developer test unit somehow. Based on that data, I would've gone with the title "New 5d Mark III Firmware?" instead of your impulsive "Canon blocking Magic Lantern." ​Just a tip if you'd like to be more objective and avoid jumping to conclusions - a prerequisite of being considered "news."  

Don't be a troll, Andrew. What's Canon suppose to do, notify ML and let them know they have a new firmware coming out, and then wait until they have a compatible version?

Yup, I got the same exact problem shooting a music video. I was in S-Log and at 32,000 ISO. I haven't been able to determine any settings that avoid this issue.
 
This is really disappointing/frustrating. I'm going to have to mask and fix each frame. 

This base would be much more useful if Panasonic had thought to include holes and clamps for rails. It will be difficult to rig this camera with a matte box, focus gear, and other accessories. I'm curious to see what solutions people come up with to address this. 

 

Ideally, the brick could have been designed with cables, so that it could be mounted somewhere other than directly underneath the camera.

 

All in all this is an incredibly exciting camera.

I'm pretty sure the two holes at the base of the attachment are so you can screw in 15mm rails.

Clarification. Is the 2.3x crop present in ALL 4k recording (both 3840x2160 and 4096 x 2160) or just in Cinema 4k (4096x2160)?