same f-stop, frame size and different depth of field?

[YOSUKE]

First of all, I'm sorry my poor english. so it is quiet difficult for me how to express..

Anyway...


For example.. in the case of still film camera..

Bigger film format have more shallow depth of fileld ..is it right?
Because we can get same screen frame size with more long focal lens?


And digital camera which is cropped body and with 35mm focal lens..
and then it shows same frame size which 35mm film camera's 50mm focal lens can give ..but diffrent depth of field.. so
we have more deep depth of field when we shoot with small film format or image sensor?

Because of cropping?

If that is right..

For example.. if I want get a 50mm lens frame size(35mm format) with s8mm or 16mm film..so at that time more wide lens gives that frame size in the case of 8 or 16 mm format..

so at that time I would come to get same frame size and more deep depth of field ?

So if we saw same screen frame size shot taken by 8, 16, 35mm film...
that shot show diffrent bokeh and depth of field?



Sorry for my terrible english...

[super8man]

Yes, you are correct. For the same APPARENT field of view, smaller format cameras have greater depth of field than larger format cameras.

That's what made super 8 a big hit over 16 - there was a natural INCREASE in the depth of field which made focusing easier for untrained folks.

And yes, if you shoot a LARGE format camera, depth of field is very small especially when shot with larger apertures (small f numbers)...makes you a better photographer since it is less forgiving.

Video cameras are a different deal wrt to depth of field. I'll let others discuss why they have incredible depth of field compared to film cameras. That's why even super 8 can make tight shots with blurry backgrounds when video cameras stilll keep way too much in focus.

Hope this helps.

[YOSUKE]

Thanks very much for your information..

And how about..S16 and HD CINE camera?

S16 shows more shallow depth of field than any HD format camera?

I like film's shallow depth of fileld and beatiful bokeh.

So I wander that S8 shows shallow depth of field than hdv camcorder camera..

and S16 shows shallow depth of field than HD cine camera.


:o

[AKIO]

here isn't help to you?
http://www.mediachance.com/dvdlab/dof/index.htm

[S8 Booster]

you may play withe these dof calculators to simulate various dofs by vary the parameters.
Depth of Field calculator

[johnnhud]

here isn't help to you?
http://www.mediachance.com/dvdlab/dof/index.htm

Wow! This was an amazing article! If I weren't such a lousy handy man I'd make it myself! Maybe I can get a friend to help!

[BigBeaner]

That guy makes it sound like you can't do rack focuses or selective focus on video/ENG cameras which is untrue, you can do just the same rack focus just by using a telephoto, low F-stop and changing the shutter speed and a ND filter if needed. I use a similar camera as to what he uses and have had just as shallow DOF without that device although have the image softened is a good idea.

[drsanchez]

Video cameras are a different deal wrt to depth of field.

I don't think they are. DOF in a video camera depends on sensor size (and focal length and aperture) in exactly the same way as a film camera depends on negative size.

[Evan Kubota]

I'll let others discuss why they have incredible depth of field compared to film cameras.

If the sensor is smaller, it will have greater depth of field. Otherwise, no. I think super 8 probably has similar, if not more, depth of field than my GL2.

As drsanchez pointed out, the physics remain the same.

And the depth of field doesn't involve focal length per se, but also subject distance; moving the subject distance to achieve identical framing at theoretical 10mm and 100mm would give nearly identical depth of field. This seems counterintuitive at first but the numbers bear it out.