Jump to content
Mathew Collins

Photosites, K and MP

Recommended Posts

Alexa65 sensor in opengate mode has 6560 x 3100 photo sites=20336000

Alexa65's sensor is 6.5K

 

Canon 5DMarkIII's full HD video is 1920 x 1080 = 2073600

Canon 5DMarkIII's 5 sensor is 22.30 MP

 

How does MPs and photo site calculation matches?

 

by

Mathew Collins.

Share this post


Link to post
Share on other sites

There is the photosite count of the sensor and there is the pixel resolution of the recording, and they don't always match.

 

A Canon DSLR can't really record a raw image off of the sensor at 24 fps for any reasonable length of time so the image has to be reduced somehow to a smaller video format for recording.

 

Ideally any camera would be downsampling from the full sensor but often DSLR's do tricks like pixel binning and line skipping (thus creating artifacts and losing resolution) -- or simply cropping -- or a combination of these things -- to make it easier to get down to a smaller size. It varies by camera so do some homework.

 

ARRI only offers uncompressed 6.5K raw recording for the Alexa 65 so the files are huge.

 

The Canon 5D MkIII sensor is 5760 x 3840 -- you could build a camera that recorded 5760 x 3840, either raw, compressed raw (as a Red camera would), or in an RGB compressed format like ProRes, but it would have to have a processor large enough to handle that data and a cooling system that could keep the sensor from overheating while taking pictures 24 times a second or higher. DSLR's generally don't have those features.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



  • Ritter Battery



    Rig Wheels Passport



    Media Blackout - Custom Cables and AKS



    Abel Cine



    CineLab



    Serious Gear



    Paralinx LLC



    Wooden Camera



    Metropolis Post



    Broadcast Solutions Inc



    Gamma Ray Digital Inc



    New Pro Video - New and Used Equipment



    Glidecam



    Visual Products



    Tai Audio


×
×
  • Create New...