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Still Lenses Narrower DOF than Cine Lenses on same Stop

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Giancarlo Bianchi

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Can anyone confirm this information?

I just was told by an DOP than 35mm still lenses (nikon) has shallower Deep of field than Cine Lenses on the Same stop.

For me it is good news, not so much for my focus puller!!! :angry:

Good Day!
 
Giancarlo Bianchi said:
Can anyone confirm this information?

I just was told by an DOP than 35mm still lenses (nikon) has shallower Deep of field than Cine Lenses on the Same stop.

For me it is good news, not so much for my focus puller!!! :angry:

Good Day!
Click to expand...

Hi,

Sorry to destroy your DOP's credibility but that is just BS. Any lens of the same focal length at the same f stop will have identical DOF.

Stephen
 
Do not believe magicians ! or fortune tellers... Try yourself and see ...
 
On RED it makes no difference. Where you get narrower / thinner / shallower DOF from a "stills" lens is when the lens covers the full frame 35 format *AND* you are shooting in that format.

DOF is determined by aperture -- as in larger aperture equals shallower DOF. How the viewer / photographer perceive the DOF depends on focal length and field of view.

A FF35 stills lens @ 100mm f2.8 is going to give you the same angle of view and amount of DOF as a S35mm lens @ 100mm f2.8 when mounted on a S35 camera.

Edit> Others were faster...
 
Erik Widding said:
If he is referring f-stops (i.e. nikon marking) vs. t-stops (i.e. cine marking),
he actually has it backwards.:head_explode:
Click to expand...

Hi Eric,

The difference on a modern prime is going to be very small indeed.

Stephen
 
That`s just what I tought!

He told be trough a quick cellphone call while I was walking down the street. He also mention the fact that Still Camera sensors are wider than the red, so that`s why they give shallower depth of field.
I think maybe he`s got confused when you take stills with a full frame sensor.
 
Kenneth Elkington said:
He's probably a bit confused by the usage of the same lenses for APS-C and full frame sensors, in which there would be a change in DOF.
Click to expand...

They'd have the same Depth of Field but different Field of View, just like cropping a print...

...or have I had too much Cab Sav?
 
Liam Hall said:
They'd have the same Depth of Field but different Field of View, just like cropping a print...

...or have I had too much Cab Sav?
Click to expand...

Same FOV and same DOF provided they are on the same camera. (Obviously PL lenses don't cover the sensor of full frame still camera)
 
So is f/2.8 on a full-frame EF lens the exact same diameter as f/2.8 on an APS-C EF-S lens? I never really stopped to think about that. Obviously, the FF35 lens has a much larger image circle.
 
Yes Tom, diameter would be the same. F-stop is a ratio that represents the aperture size in relation to focal length. So a 100mm lens at F=2.8 would have the same diameter of aperture regardless of whether its image circle covers FF35, S35, APS-C, etc.. Or in other words a 100mm FF35 lens and a 100mm APS-C lens would both have the same diameter of aperture iris when set to F2.8.

Thus the reasoning behind using T-Stops, especially for motion picture work. T-Stops represent the actual light transmission or "speed" of the lens as determined by its transmission efficiency (% of transmitted light) in relation to its F number.
 
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