Epic Film Back dimensions (s)

[spooker]

I've been doing a lot of searching and haven't been able to find any reliable information so please forgive me if this info is already "out there".

I'm trying to do a 3D camera track in Nuke / PFTrack and need to know the dimensions in mm of the different resolutions as the capture area and aspect are different for each size.

An example would be 5k full sensor is 27.7 x 14.46mm. But what is it when it's 4kHD in mm? Or 3k, or 2k?

I thought there would be on a spec sheet or in the manual but haven't found anything. Any help would be greatly appreciated.

 

[John Marchant]

0.0054 x number of pixels gives size in mm

ie.

Full frame 5120 x 2700 = 27.648 x 14.58 mm
4k HD 3840x2160 = 20.736 x 11.664 mm

etc etc

 

[spooker]

you are a life saver. thank you for the fast response.

 

[Rick van den Berg]

probably a huge bump, was googling for this, and led me here. I'm also a bit into matchmoving now and i was just wondering why 0.0054? is this also for other camera's?

 

[Phil Holland]

probably a huge bump, was googling for this, and led me here. I'm also a bit into matchmoving now and i was just wondering why 0.0054? is this also for other camera's?

Heh. 3 year + bump is indeed a big one.

Each camera sensor has it's own unique pixel size, unless they share the same pixel size/pitch of some other sensor (and in some cases the same design).

In the RED world you have:
- Mysterium-X with a pixel pitch of 5.4 microns.
- Dragon with a pixel pitch of 5 microns.

It's no free lunch on the pixel size and design front. New sensor technology and image processing technology can have big benefits towards the typical mindset of "larger pixels see better (cleaner image) in low light", which is generally true, but not always the case as modern sensor design techniques can provide certain gains. We'll likely see smaller and smaller pixel pitches. Down to about 3.2/3.4 microns. Smaller than 4-5 microns is actually very hard to do for a high end digital cinema camera and the image quality standards they need to uphold.

 

[Michael Tiemann]

Smaller than 4-5 microns is actually very hard to do for a high end digital cinema camera and the image quality standards they need to uphold.

Because diffraction starts to negatively affect everything after about f8. Larger pixel pitch means one can use f11 and beyond without serious degradation. Smaller pixel pitch starts to make f8 and below questionable.

 

[Phil Holland]

Because diffraction starts to negatively affect everything after about f8. Larger pixel pitch means one can use f11 and beyond without serious degradation. Smaller pixel pitch starts to make f8 and below questionable.

It's actually not just about diffraction either. Moire, aliasing, and pixel generated artifacts are very difficult to deal with after a certain point. At least currently. I'm actually hoping that RED sticks to this 5 micron pixel pitch for some time with the Dragon sensor and develop "the future" based on that size. But who knows. Maybe there's another leap in there that makes sense.

 

[Rick van den Berg]

Heh. 3 year + bump is indeed a big one.

Each camera sensor has it's own unique pixel size, unless they share the same pixel size/pitch of some other sensor (and in some cases the same design).

In the RED world you have:
- Mysterium-X with a pixel pitch of 5.4 microns.
- Dragon with a pixel pitch of 5 microns.

It's no free lunch on the pixel size and design front. New sensor technology and image processing technology can have big benefits towards the typical mindset of "larger pixels see better (cleaner image) in low light", which is generally true, but not always the case as modern sensor design techniques can provide certain gains. We'll likely see smaller and smaller pixel pitches. Down to about 3.2/3.4 microns. Smaller than 4-5 microns is actually very hard to do for a high end digital cinema camera and the image quality standards they need to uphold.

clears it up, thanks!