Unwanted video crop

[rafael_macia]

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I know I must have done something wrong, but exactly what  .... is a mystery.

 

I lined up a shot I wanted to shoot a video of. The camera was tripod mounted.

 

First, I pressed the LV button which presented a frame for the 16x9 (3840x2160),  video I wanted to shoot.

As far as I can remember, the 23 second clip was shot without any problems. The picture remained on the monitor, as I composed it.

What I got was a cropped in view of my composition?

 

I didn't compose for the cropped in view ...... 

I haven't the faintest idea how/or why the video ended up cropped.

 

Would appreciate any insight. 

 

thanks

 

Rafael

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[scott kirkpatrick]

The SL takes its 4K video signals from the "Super 35" area in the middle of the chip.  This is slightly smaller than APS-C, leading to a multiplication factor of about 1.6.  If you want to shoot still images to anticipate the coverage that your lens will provide, set the framing to APS-C (as would happen with a TL lens mounted).  Why do this?  Well, that chip area is a standard in digital cinema, Leica makes some very high quality lenses that cover it, and in the SL, it results in exactly the 8 MPixels that are required, so no down-conversion is required.  Sony's A9, on the other hand does use the full frame area for its "6K" video signals, which are down-converted to 4K on output.  This is claimed to offer more bits of color signal and some Moire resistance.  But it is interesting to note that FullFrame, APS-C and even the latest M43 cameras now all take their 4K video signals from the chip area.

[rafael_macia]

The SL takes its 4K video signals from the "Super 35" area in the middle of the chip.  This is slightly smaller than APS-C, leading to a multiplication factor of about 1.6.  If you want to shoot still images to anticipate the coverage that your lens will provide, set the framing to APS-C (as would happen with a TL lens mounted).  Why do this?  Well, that chip area is a standard in digital cinema, Leica makes some very high quality lenses that cover it, and in the SL, it results in exactly the 8 MPixels that are required, so no down-conversion is required.  Sony's A9, on the other hand does use the full frame area for its "6K" video signals, which are down-converted to 4K on output.  This is claimed to offer more bits of color signal and some Moire resistance.  But it is interesting to note that FullFrame, APS-C and even the latest M43 cameras now all take their 4K video signals from the chip area.

 

Scott,

Thanks. I kind of lost you, but in a way begin to understand. I think I may have took a Full frame still. Than somehow  .... from the same point of view..... took a 4K video without framing the shot.

Something like that ..

[ramarren]

APS-C format presents a useful but not entirely accurate means to judge the video crop. These examples just made with 15mm lens fitted to the SL: 

 

Test - 15mm on FF

 

Test - 15mm on APS-C

 

Test - 15mm on 4K Video capture:  https://flic.kr/p/Tiob7d (15 second)

 

I don't see a big discrepancy between what I see in the viewfinder and what my video capture looks like in video mode, but APS-C is a 1.5x crop factor vs the video capture at about 1.6x. 

[ramarren]

Follow up: 

 

The difference puzzled me, but I figured it out. 

 

My sample above are with 3:2 on the two stills, but the video is 16:9.

So I switched the crop on the APS-C to 16:9 ... Now the framing is identical. 

 

Glad I figured that out. It wasn't making sense to me that they'd be so different.