Yak
Well-known member
Did you ever try and pull focus on a large sensor while "run and gunning" at f/2.0?
AG-DVX200 4K Large-Sensor Handheld Camcorder
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Did you ever try and pull focus on a large sensor while "run and gunning" at f/2.0?
Jaime Valles
Veteran
Do people understand that "pulling focus" means keeping subject CONSTANTLY in focus, not letting it go soft for a sec as subject gets closer/farther away from cam, then adjusting 'til sharp again? Not so easy on the fly.
Also, what do people think a good run n' gun stop WOULD be for this cam? 5.6? 8? Do we think the required ISO boost to stay at those stops in darker environments will still be clean enough to use?
Also, what do people think a good run n' gun stop WOULD be for this cam? 5.6? 8? Do we think the required ISO boost to stay at those stops in darker environments will still be clean enough to use?
philiplipetz
Veteran
this is the problem I had with the C100 and A7s. About 25% of my shots were ruined by subjects moving out of focus. I first worked as a still news photographer in the days of manual focus so I can react quickly. However, that is not enough when you are framing as you focus. Too much going on. In a doc you never know what shot will be the essential one. Missed too many of them. Need a doc cam with sensor in sweet spot between large DOF and good low light. Preferably with subject tracking. Big hopes for DVX200. Would not use f2.0 even if it were there, except for static tripod work.
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Thomas Smet
Veteran
You do realize lenses are harder to make the larger the sensor is? This is why it is much easier to build a fast zoom lens for a 1/3" sensor. This camera has a 4/3" size sensor and making a super zoom at a constant aperture speed would be extremely difficult due to the laws of physics.
Besides most traditional video cameras didn't even have a constant aperture lens. A lot of even high end cameras would have a range of f1.8 to f2.8 across the zoom range. Thats 1 and 1/3 of a stop difference. The DVX200 lens isn't really any different. It starts at f2.8 and goes to f4.5 which also happens to be 1 and 1/3 of a stop. While on the wide end f2.8 isn't as bright as f1.8 on some traditional video cameras you also have to factor in how much larger the sensor is on the DVX200.
Bassman2003
Veteran
I would like to see Panasonic allow assigning ISO to the third wheel on this camera. So you could pick an f-stop and adjust ISO for exposure. A very video-centric use of ISO for this dedicated video camera.
Jaime Valles
Veteran
That's impossible, even for a computer!Just like shooting womp rats in my T16 back home
It's definitely not easy, and if the subject is walking towards the camera it's almost impossible with a shallow DoF. When I'm doing unscripted, unpredictable work (concerts, documentaries, etc.) I try to position myself to avoid as much subject movement as possible. Then clever editing covers up any bad focus.
Semi-off topic but IMO, this is where the enthusiast/low end pro camcorders will settle -~ 1" and MFT, a reasonable compromise between the price and the performance. The ILC's will settle on the APS-C size and only the high end pro will go to FF and MF, in both video and stills.
fastfinger
Well-known member
The high end/pro camera, obviously, don't have auto-focus but Canon is using their Dual Pixel technology on C300 MK II (s35) and I don't see why it couldn't be used on the FF sensors. Panasonic is using their Depth From Defocus (really, the worst name ever) tech on GH4, G7 and so on and, as I understand it, DFD needs more processing power than on GH4 to nail it more accurately in 4K. A7s has AF on a FF sensor but it's not stellar. On the other hand, A6000 has it on the APS-C in 1080p and Sony claims that it's the world's fastest. All these various approaches are theoretically only marginally dependent on a sensor size.
The on-sensor stabilization works on the shifting-pixel concept. The same idea also provides image resolution greater than its nominal. As an example, Olympus EM5 MK II has a 40 MPX resolution off a 16 MPX sensor. Currently, the processing power of the low end cameras is not sufficient to give a multiple pixel image in real time, making it impossible to capture moving images, but it should be on the next generation of cameras.
Barry_Green
Moderator
It might affect autofocus... don't know whether it would affect stabilization.
It might be better than on the GH4; faster frame rates lead to less rolling shutter. The DVX200 is designed to support 4k/60p, so it's possible that it might be running at 48fps internally when shooting 24p, to get the faster frame rate and reduce the rolling shutter effect. We won't know for sure until we see one in action.
philiplipetz
Veteran
Mike Harvey
Veteran
Noel Evans just posted in the AF100 section that he has a pre-production version and is working on a video right now...
http://www.dvxuser.com/V6/showthrea...w-what&p=1986560028&viewfull=1#post1986560028
http://www.dvxuser.com/V6/showthrea...w-what&p=1986560028&viewfull=1#post1986560028
ugafan
Looking for a woman
alright noel, it's been 4 days. on the 5th day the rioting begins.
philiplipetz
Veteran
Holden early look results: http://www.redsharknews.com/production/item/2735-first-impressions-of-the-panasonic-dvx200
