precise R1 sensor pixel size needed... Mr Nattress ?

[Daniel Crooks]

hi people

I'm hoping to find a definitive number for the exact pixel size of the R1 in mm.
I've done quite a bit of searching but there are confusing numbers out there...
according to the RED ONE specs the R1 has a pixel size of 0.005419922mm
according to jlf.com it is 0.005400391mm
but according to another post it is 29microns square which gives 0.005385165mm

I don't need the actual photosite ? size just the distance between each pixel centre, so something very close to one of the above numbers , I just need to know which one to believe !
I realise this is kind of ridiculous but it's for some rather arcane trig i'm working on and the numbers are being amplified to a point where those decimal places really start counting...

thanks../daniel

[Jeff Kilgroe]

Well, I'm at a loss as to what calculations you could be doing that would require such a level of precision... Short of designing your own alternative OLPF or sensor mask. But you don't need the photosite well size, just the gross pixel dimensions. That said, I'm going with the first number you specified -- 0.005419922mm. And don't worry about the 29 microns square, someone was just rounding it off.

Anyway, got me curious... What is it that you could be doing?

[Ralph B.]

Respectfully, I don't work for RED, and I'm certainly not trying to stifle discussion, but your question seems to be something that is intrinsically part of the math that makes up the RED images. You should probably talk to RED directly, since it seem dangerously close if not over the line of IP.

[David Rasberry]

Reminds me of the math professor who gave a physics student and and engineering student a thought experiment to solve:
" Imagine you both are at one end of a long hall and there is a beautiful woman at the other end. You each take turns walking toward the woman, but you can only go half of the remaining distance each turn. The one who gets there first gets to have sex with her. Who wins?"
The students both begin madly crunching the numbers on their calculators. Finally the physics student throws his hands up in exasperation; " Impossible, you never get there!"
The engineer says, "Yeah, but I can get close enough."

[Graeme Nattress]

I've always done the math with 5.4 microns

Graeme

[Daniel Crooks]

yeah that's what I've been using, but It's very reassuring to know that's what you use Graeme !

and for those that were interested. I'm working on a script to control a moco head.
The idea is that I can plug in the focal length and capture resolution and the script will do the rest (single pixel FOV !)
you'd be surprised how much of an effect those decimal places have, especially with long lenses.

../daniel