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Convergent Design Odyssey
...and other Convergent Design products.

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Old October 16th, 2009, 06:14 AM   #1
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Join Date: Oct 2009
Location: London
Posts: 15
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Hi fella's

Ive been messing alot lately with using the Nano to capture lossless, clean element shoots, such as rolling dust,inks and so on. I do alot of digital vfx and i like to use as much 'in-camera' shot stuff at high speeds that i can to supplement vfx shots.

The upcoming overcranking features will certainly benefit - but ive just recently stumbled across a way to capture up to 240 fps that i thought some of you may be interested in.

Actually, its more the camera i hired/tried out - a Sony HDR-XR520V.
This camera has Sonys 'Smooth Slow record' mode - which can shoot up to 240fps on an NTSC model, 200 on PAL.
However, the great thing is that the way this camera (or similar models with such feature) records this data.

In a 3 second burst mode at 240fps - it has an internal buffer that stores this burst - then allowing it to write the frames to tape (if you wanted to use the tape) at 60i/50i full HD.

The HDMI out remains live while shooting in this mode, and so the Nano IS ABLE to record from the cameras internal buffer all of these frames, but at 60i 29.97. Which is excellent.

HOWEVER - the camera’s CMOS resolution is squashing to get those extra FPS - and so even though we can get a full HD signal - the camera has chopped out some resolution, as we’re getting 4 times as many frames per second. I would say a Full 1080 frame probably wont cut it/satisfy you - but put into a 720p edit, the shots look pretty good.
If you get this from the tape (never again thanks to the Nano) - it looks horrible of course.

Though thanks to the clean master 140mbps of the Nano, the images are acceptable.
The only limitations this means is careful consideration for a highspeed shot. Closeups of water impacting someone in the face wont hold up to crispness and expected resolution - but its surprisingly good for exterior, well lit scenes where the subject is fully in frame.

Its also very effective for element shoots where a loss in resolution doesn't impact terrible on what is already a chaotic/noisy image.

If you connect one of these cams to Nano via HDMI - the Nano will display 60i 30 and record this as the camera sends out the 3 second 240 buffer sequentially at the recordable frame rate.

Be interested to see others try this out. Hope this is of interest to some of you guys.
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