In-camera,programmable, tweakable DOF?

[jaadgy akanni]

At whatever exposure, whatever shutter setting, would it be feasible to change DOF to your liking? We're stuck with a fixed lens, if breathing compensation is possible, how about the ability to make the lens change the focus distance behind and/or in front of the subject without messing with exposure or shutter settings? I'm thinking, something like superimposing a preset bokeh behind (or in front) of the subject. That way, when I'm shooting a wide angle shot, and I decide I wanna make it a little more normal or telephoto, I set it that way. Of course, we're dealing with raw here, so you'd still have the option of leaving it that way or tweak DOF before you export it to your NLE or a hard drive. D'you think I have to much time on mee hands?

[shaocaholica]

Do you mean exposure lock like on DSLRs? You lock the exposure and when you close the iris down, the camera automatically increases the shutter duration? Is that a common feature on video cameras? RED one?

But you want to do this during a single shot? Would be kind of a cool effect.

[kmikami]

You're talking about adding a lens blur as a post effect? Why do that in camera? Just do it in After Effects. How would the camera know what to blur unless it records a depth map of some sort?

[shaocaholica]

You're talking about adding a lens blur as a post effect? Why do that in camera? Just do it in After Effects. How would the camera know what to blur unless it records a depth map of some sort?

I think he's talking about changing the aperture and focus during a shot in order to move the in focus zone while having the camera automatically control the shutter speed to maintain consistent exposure.

[jmalmsten]

Or "aperture priority" as it's called in most cameras... in some other cameras you can set what functions to be on auto and what to be on manual, where one would set it up as "shutter=auto" and "aperture=manual". Seems like an ordinary thing to put in the camera...

DOF on the other hand is NOT something that you are able to change once the image is sampled from the sensor... since it has little to nothing to do with the sensor at all. (except sensor size-that is, but that's hardly variable in scarlets case). It's something that your lens is producing and the sensor is sampling. RAW opens up many possibilities but post-DOF-control is not one of them. And if that weren't true, then there wouldn't be hardly any complaints about scarlet having a fixed lens except the added control some lenses would give...

[shaocaholica]

Or "aperture priority" as it's called in most cameras... in some other cameras you can set what functions to be on auto and what to be on manual, where one would set it up as "shutter=auto" and "aperture=manual". Seems like an ordinary thing to put in the camera...

Except how many cameras let you smoothly adjust the aperture while the camera is rolling and also shift the shutter speed to compensate for your changing of the aperture?

[davide]

Except how many cameras let you smoothly adjust the aperture while the camera is rolling and also shift the shutter speed to compensate for your changing of the aperture?

Changing shutter speed mid shot would also cause some stuttering in the image and will make for changes in the amount of motion blur. Opening or closing up a stop will require the shutter speed to be doubled or cut in half. People may notice if the camera suddenly shifts from a 1/48 shutter to a 1/24 shutter.

I think kmikami is right though. He does seem to be asking for a setting that could add a blurred background either behind or in front of the image. Since he's asking for this to be done without the lens aperture having to change I'd assume that he wants this to be a digital effect rather than something done by the lens. The fact that he goes on to say that since the camera outputs a rawfile so one could always get rid of the blurred effect later supports the idea that he is asking for an incamera digital-blur function.

davide

[jaadgy akanni]

Changing shutter speed mid shot would also cause some stuttering in the image and will make for changes in the amount of motion blur. Opening or closing up a stop will require the shutter speed to be doubled or cut in half. People may notice if the camera suddenly shifts from a 1/48 shutter to a 1/24 shutter.

I think kmikami is right though. He does seem to be asking for a setting that could add a blurred background either behind or in front of the image. Since he's asking for this to be done without the lens aperture having to change I'd assume that he wants this to be a digital effect rather than something done by the lens. The fact that he goes on to say that since the camera outputs a rawfile so one could always get rid of the blurred effect later supports the idea that he is asking for an incamera digital-blur function.

davide


That's exactly what I'm suggesting. What gave me this idea is that there's should be a way in which the sensor could gauge and measure the varying grades of focus behind (and in front?)of the subject, so that blur, or rather, a bokeh effect could be applied starting at a certain point or degree of focus, without messing with exposure or shutter speed . It would be like an in-camera designing of your own DOF. Maybe I'm not wording right???

[shaocaholica]

That's exactly what I'm suggesting. What gave me this idea is that there's should be a way in which the sensor be could gauge and measure the varying grades of focus behind (and in front?) the subject so that blur, or rather, a bokeh effect could be applied starting at a certain point or degree of focus, without messing with exposure or shutter speed . It would be like an incamera designing of your own DOF. Maybe I'm not wording right???

Don't hold your breath on this. The technology exists for this for still photos but its not commercial yet and probably not a high enough resolution for serious use compared to whats out there right now.

[davide]

You can do that with Magic Bullet looks. It doesn't look the same as optical blur though, which is rather hard to mimic. It's a processor intensive task, so it may be a better option to simply do in post.

davide