Welcome to our community

Be a part of something great, join today!

Log in
  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

depth of field of various scarlet editions

B

bob wilson

Active member
Joined
Apr 26, 2009
Messages
37
Reaction score
0
Points
0
So, is the DOF going to be shallower (more out of focus) on the FF scarlet than the 2/3" scarlet?

How will the DOF compare between scarlets and the epics? I'm assuming DOF will only depend on the sensor size?

Is the EPIC 617 going to have such a shallow DOF (so much out of focus) that it will make it difficult to use?

Will a FF scarlet have the same DOF as a 35mm SLR camera?

Would a 35mm SLR lens be useable on a scarlet FF camera?

So many questions so little time! :)
 
Without getting into details, in real-world terms the answer is yes. The FF scarlet will have a shallower dof then the 2/3 version by quite a lot.

I'll let someone with a better understanding of the subject explain why, for fear of getting something wrong. My understanding is the FF scarlet will deliver a dof equal to that of a 35mm film camera if the same lens is used at the same distance from the subject.
 
bob wilson said:
So, is the DOF going to be shallower (more out of focus) on the FF scarlet than the 2/3" scarlet?

How will the DOF compare between scarlets and the epics? I'm assuming DOF will only depend on the sensor size?
Click to expand...

We discuss this regularly on this site, I'm surprised you haven't read one of the hundred or so threads on this topic.

The sensor size affects the field of view of a lens - assuming the lens projects an image that fills the larger sensor, that same focal length will produce a more telephoto image on a smaller sensor because the projected image is being cropped more. So to compensate, people use a shorter focal length on a smaller sensor to achieve the same view as a longer focal length on a larger sensor. A very rough rule of thumb is that the magnification factor used when determining what focal lengths give an equivalent view is about equal to the effective difference in depth of field in stops.

In other words, the magnification difference between 2/3" and Super-35 is 2.5X, and that's about the difference in depth of field in terms of f-stop once you match view. So practically speaking, you'd use a 20mm lens on a 2/3" camera to get the same view as a 50mm on a Super-35 camera, and you'd need to stop down the 50mm lens by 2.5-stops to get the same depth of field as the 20mm lens on the 2/3" camera (or you'd need to open-up the 20mm lens on the 2/3" camera by 2.5-stops to match depth of field of the 50mm lens on the Super-35 camera.)

Between a 2/3" sensor (9.58mm wide) and a FF35 sensor (36mm wide), there's a 3.75X difference assuming you are just interested in matching horizontal view. So you'd have to use a 75mm lens on a FF35 camera to match the view of a 20mm lens on a 2/3" camera. And because of that difference in the focal lengths used, you'd have a practical difference in depth of field of 3.75-stops.

Now whether those differences are too much to deal with, if the depth of field of the 2/3" camera is "too deep" or that of the FF35 camera as being "too shallow", that just depends on the situation and what f-stop you are shooting at.

Is the EPIC 617 going to have such a shallow DOF (so much out of focus) that it will make it difficult to use?
Click to expand...

Depends on what stop you are shooting at and how difficult the focusing is for that set-up. A wide-angle shot in daytime, not really a problem... a telephoto close-up of a moving actor shot wide-open at night, well, I'd hire a really good focus puller if I were you.

It's the same challenges that an IMAX shooter faces.

Will a FF scarlet have the same DOF as a 35mm SLR camera?
Click to expand...

If the 35mm camera has a FF35 sensor, yes, assuming that the FF35 Scarlet is actually using and recording all of the FF35 sensor information.

Would a 35mm SLR lens be useable on a scarlet FF camera?
Click to expand...

Probably, though I don't know about all the auto lens functions.
 
Cheers guys - actually, I do and have understood the DOF theory for some time, but the source of my confusion was the Red.com website blurb for the Red One:"You get the same breathtaking Depth of Field and selective focus as found in film cameras using equivalent 35mm P/L mount lenses."

- this contradicts the specs here: http://www.red.com/epic_scarlet/ which indicate that the Red One's sensor size is smaller than FF. Hence if only FF has the same DOF as a FF 35mm camera, then how can the Red One (with its smaller sensor) have the "same DOF as found in film cameras"?

Doesn't make sense.. surely if Red One has a sensor smaller than FF then it isn't going to give FF DOF
 
bob wilson said:
Cheers guys - actually, I do and have understood the DOF theory for some time, but the source of my confusion was the Red.com website blurb for the Red One:"You get the same breathtaking Depth of Field and selective focus as found in film cameras using equivalent 35mm P/L mount lenses."

- this contradicts the specs here: http://www.red.com/epic_scarlet/ which indicate that the Red One's sensor size is smaller than FF. Hence if only FF has the same DOF as a FF 35mm camera, then how can the Red One (with its smaller sensor) have the "same DOF as found in film cameras"?

Doesn't make sense.. surely if Red One has a sensor smaller than FF then it isn't going to give FF DOF
Click to expand...
They are comparing the RED ONE's sensor to a 35mm movie camera not stills.

Have a look here:
http://www.reduser.net/forum/showthread.php?t=23770

Also, don't get confused FOV (field of view) and DOF (depth of field).
 
You must log in or register to reply here.
Back
Top