12K Sensor dimensions

The place for questions about shooting with Blackmagic Cameras.
  • Author
  • Message
Offline

GranderFunk

  • Posts: 3
  • Joined: Fri Oct 16, 2020 8:04 pm
  • Real Name: Tom Funk

12K Sensor dimensions

PostWed Sep 28, 2022 2:49 am

I'm trying to calibrate the nodal offset of a camera tracker for virtual production using the Aximmetry camera calibrator. To get accurate results, I need to know the exact sensor size (well, the sensor size with regards to the displayed pixels, of course).

I'm shooting 8K 16:9. According to the specs on the BM12K, the sensor is 27.03mm x 14.25mm. I'm assuming that's at what would be 8K DCI full frame - which is 8192x4320 pixels. 8K 16:9 is then 7680x4320. So I'm assuming that the sides are being cropped and the full 14.25 height of the sensor is still being used. So my calculation is simply: (7680/8192)*27.03 for sensor width = 25.34mm.

My question is - are my assumptions correct about how the sensor is being used in 8K 16:9?

I ask because my calibration numbers (for the nodal offset) are way off - and I'm trying to figure out what the source of error might be.

Unfortunately VFX Camera Database (vfxcamdb .com) doesn't include the 12K...
Offline
User avatar

dondidnod

  • Posts: 633
  • Joined: Sun Nov 25, 2018 7:52 am
  • Location: Castro Valley, CA
  • Real Name: Donald Keller

Re: 12K Sensor dimensions

PostWed Sep 28, 2022 7:08 pm

Yes, you are correct, according to this site:

Format: 12K, 8K, 4K 16x9
Resolution: 11520x6480
Dimensions: 25.344mm (H) x14.256mm (V) x 29.078mm (diagonal)

LENS COVERAGE AND CAMERA COMPARISON TOOL

https://cvp.com/tools/cameralens

BTW, due to the recent devaluation of the pound, this British site is selling the URSA Mini Pro 12K for $5,829 USD, not $6,385 if bought in the U.S.
Offline

GranderFunk

  • Posts: 3
  • Joined: Fri Oct 16, 2020 8:04 pm
  • Real Name: Tom Funk

Re: 12K Sensor dimensions

PostWed Sep 28, 2022 10:57 pm

Great, thanks! I was looking for a site like this that included the 12K.
Offline

Zweistein

  • Posts: 206
  • Joined: Tue Oct 15, 2019 5:19 pm
  • Location: Germany
  • Real Name: Jannik Tesch

Re: 12K Sensor dimensions

PostFri Sep 30, 2022 8:52 pm

Here you got the data visual as well and can compare it: https://sensorsizes.com
Cinematographerwww.janniktesch.comwww.sensorsizes.com
UMP 4.6K G1 6.9.4 – PCC4K OLPF 8.1 – Resolve Studio 18.6.5 – macOS 14.4 – MacBook Pro 2023, M2 Pro, 14"
EIZO CG247XUltraStudio Monitor 3G 12.5 – Micro Panel

Return to Cinematography

Who is online

Users browsing this forum: No registered users and 79 guests