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About DOF in RED ONE

R

Redefinition

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Hello David,
as far i know one of the best features in RED ONE is having the same depth of field we get on 35mm film cameras,
but some DP´s have told me that in RED ONE DOF is less than in 35mm

please solve me this doubt

Thanks
Karim
 
Hi,

With Digital cameras you have to be more accurate with focus than on film. Being slightly off is very much more obvious than with film.

Stephen
 
Stephen Williams said:
Hi,

With Digital cameras you have to be more accurate with focus than on film. Being slightly off is very much more obvious than with film.

Stephen
Click to expand...
funny.. checking you being so condescend-ing recognizing red as having superior resolution than any other 35 film camera..

your fanboy yours sincerely
 
Benni Diez said:
Depends on how much of the chip you use, which depends on the mode you shoot in. Full 4,5k would pretty much be like 35mm in terms of width, and thus DoF. M.I.right?
Click to expand...

No.

DOF depends on CoC, which for RED One can be assumed to be as small as 7 microns. Thus, DOF on Red One will be smaller than that on 35mm film, which generally assumes as much as 30 microns CoC.

Knowing CoC, aperture, focal length and subject distance you can calculate DOF, easy :whistling:
 
Pawel, could you please post the formula (With the microns variable)?
 
Eisenstein said:
Pawel, could you please post the formula (With the microns variable)?
Click to expand...

Hi,

Basically you have to test and use what works for you. Same issue with other 35mm sensor cameras and High end 2/3" chip cameras using very sharp lenses like DigiDrimes. I have been caught out using a Viper due to there being far less DOF than I was expecting.

I also believe moving grain helps you get away with more error.

Stephen
 
Stephen Williams said:
Hi,

With Digital cameras you have to be more accurate with focus than on film. Being slightly off is very much more obvious than with film.

Stephen
Click to expand...

That doesn't make sense. Perhaps the silicone is physically shallower in depth than a slide of 35mm film, thus decreasing the maximum permissible COC
 
Film emulsion has thickness. I believe Kodak stock is something like 22 layers deep. As light travels through the layers it diffuses and disburses. This is part of the reason that it can be difficult to get identical registration of different colors as they are different frequencies and on different emulsion layers. We regularly set the depth of certain lenses a little negative or "deep" by a few microns to "dig into" the emulsion a bit.

An electronic sensor has an imaging surface. It is an absolute singular depth (that is unless you count the distance from lens to center of sensor as shorter than lens to corer of sensor, but that's another discussion).

The effect of this is a shallower depth of field (or to be technically more accurate, a less-forgiving depth of field) but not a higher resolution image.
 
Film emulsion depth vs. sensor surface considerations aside, there's also the FOV. RED One 4K is a cropped area of the S35mm frame. It's actually just a fuzz larger than academy 35mm, but about 10% smaller than S35. Cropping into the imaging plane has an effect on the perceived DOF, the same way shooting 2/3" or 16mm has deeper perceived DOF than 35mm and even more so with 1/3" sensors, etc..
 
well, after few commercial projects shooting,
the Red Cam definitely less DOF then any of 35mm film cameras

Cheers
 
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