new article - HVX Framerates explained

Antoine_Fabi said:
Guys,

there is a lot of work in this article !

thanks !
very appreciated !
Click to expand...

Yes there is!

Eveyone should keep these files around. When your looking for a certain
look you can reference these files based on your timeline.

Nice work guys!

Steve
 
yes it can be a little confusing.. both if you never have used a varicam, or never have used a varicam.
 
Thanks, guys. This is a great tease for the upcoming book. I'm definately on the waiting list now.

And great juggling! :thumbsup:
 
I think phd alluded to the link being wrong for the:

"Click on this file to see what 60 frames per second looks like when shot at all three timebases:"

You get the All-Rates-60PN.wmv file.

Great article though. Definitely a good reference.
 
is there a waiting list for Barry's book? I hope he prints enuf copies in the first run... it wud be invaluble for anyone even considering a HVX
 
you can bet Barry's book is gonna have all sorts of awesome info in the book just like this.

And it should come with the cameras, but probally not for a few months, seeing the book has to be done first.
 
Jarred Land said:
you can bet Barry's book is gonna have all sorts of awesome info in the book just like this.

And it should come with the cameras, but probally not for a few months, seeing the book has to be done first.
Click to expand...



. . . and then it has to ship from Japan. :laugh:
 
FatDaddy said:
Barry/Jarred -
Could you save framerates in the user presets on the side of the camera? I could see using the overcranking for slow-mo on some broll and would like to pop in and out of it without digging through menus.
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Yes, the frame rate gets saved in the scene file, so you can swap between scene files. However, you have to stop recording between frame rate changes, just like on the DVX.
 
Few questions:

1) Does the variable framerates on the HVX have a similar exposure effect with over/undercranking like using a film camera? IF SO, does that mean 115 different exposure compensations needed?

2) IF SO, would you see the exposure compensation on the LCD required in real-time so you can adjust the aperature accordingly to correct it for 'proper' exposure or would you have to calculate the exposure compensation ahead of time before actually pressing the 'record' button?

Since this is digital image capturing, I would assume you wouldn't have any light loss from overcranking and vise-versa with undercranking. Afterall...it isn't a mechanical process like a film-camera.

I know that the shutter will affect the exposure so when combining the different shutter speeds with the variety of timebase and acquisition rates, should we be compensating for light loss or gain before or after pressing the record button?

Thanks for the great article BTW!

Norm
 
Norm_Li said:
Few questions:

1) Does the variable framerates on the HVX have a similar exposure effect with over/undercranking like using a film camera? IF SO, does that mean 115 different exposure compensations needed?
Click to expand...
It does and it doesn't, depending on how you want to expose. You can choose a fixed shutter speed (thus needing no exposure compensation) or you can choose to use the shutter speed in a film-style shutter angle. Your choice. When using the shutter angle it works exactly like a film camera.

2) IF SO, would you see the exposure compensation on the LCD required in real-time so you can adjust the aperature accordingly to correct it for 'proper' exposure or would you have to calculate the exposure compensation ahead of time before actually pressing the 'record' button?
Click to expand...
When using the shutter angle method, you do see the effects of the exposure on the LCD and can compensate at that time.


Since this is digital image capturing, I would assume you wouldn't have any light loss from overcranking and vise-versa with undercranking. Afterall...it isn't a mechanical process like a film-camera.
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Right, which is why you can do it both ways. It will simulate the film camera way if you want, but it doesn't HAVE to. However, if you want the motion to look like film-camera motion, you'd want to use the shutter angle method.

I know that the shutter will affect the exposure so when combining the different shutter speeds with the variety of timebase and acquisition rates, should we be compensating for light loss or gain before or after pressing the record button?
Click to expand...
Before, of course. Compensating after recording would just result in the pre-compensation footage having the wrong exposure.
 
Barry or Jarred
Hi,
im new to DVCPro HD and i will buy the DVX200 and i need to know wich system is beeter for this PC or MAC?
Thanks,
MMR.
 
MMR said:
Barry or Jarred
Hi,
im new to DVCPro HD and i will buy the DVX200 and i need to know wich system is beeter for this PC or MAC?
Thanks,
MMR.
Click to expand...
We really needn't any flame wars to brew. :grin:

They'll both work, as long as you have the proper NLE and hardware. As always though, you get more bang for your buck with PC, IMO. Probably less headaches with Mac.
 
Barry_Green said:
You can choose a fixed shutter speed (thus needing no exposure compensation) or you can choose to use the shutter speed in a film-style shutter angle. Your choice. When using the shutter angle it works exactly like a film camera.
Click to expand...
I guess I'm not following you here... say you're shooting something in 24pN mode at 24fps. Now you switch the framerate to 48fps. In a film camera, you'd have to open the iris up one stop to compensate because only half the light is passing through the gate during each exposure. The Varicam has the ability to maintain constant exposure while switching framerates by automatically adjusting the iris for you so that no matter what framerate you shoot, you get constant exposure across the board. The question is, does the HVX offer this ability? (You may have answered it in a different way, but I'm not understanding it from this post).
 
I have a question about the juggling clips. Did you record the juggler 40 different times (once for each framerate example) and then stitch mutiple clips together on one screen in post, or did you record the juggler once in 60p and manipulate the images after the fact to show an "example" of the speed differences that are attainable with the HVX?
 
Haakon said:
I guess I'm not following you here... say you're shooting something in 24pN mode at 24fps. Now you switch the framerate to 48fps. In a film camera, you'd have to open the iris up one stop to compensate because only half the light is passing through the gate during each exposure.
Click to expand...
Yes, the HVX can be set to work exactly like that.
The Varicam has the ability to maintain constant exposure while switching framerates by automatically adjusting the iris for you so that no matter what framerate you shoot, you get constant exposure across the board. The question is, does the HVX offer this ability?
Click to expand...
The HVX doesn't work like that, no. I mean, if you're on auto-iris then yes, but that's not really what you want.

You can choose to govern the shutter in one of two ways: film-style, or video-style. In film-style the shutter speed is tied to the frame rate, and going to 48fps would result in half the exposure of 24fps. You would have to compensate for that -- or let the "auto-iris" autoexposure system do it for you, which is not what you're asking.

The other way to govern the shutter is video-style, where you set a fixed shutter speed (say, 1/48). Then it will expose the 24fps at 1/48, and the 48fps at 1/48. The result will be consistent exposure, but the motion blur won't be film-style.
 
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