C200: Focus soft in Slo-mo

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cwr89

New member
Hey all,
I'm shooting 1080 @120 onto SD card
I'm using a Tamron 24-70 G1 series VIDC lens. (which supports face detection)

I haven't had the camera a very long time, so I'm shooting some studio tabletop stuff. as soon as I jump it over to slow motion I feel like I cannot grab a focus.
Is there something that I'm not doing correctly or settings I need to look into to get focused at 1080-120? I couldn't convince the boss to drop additional money on CFast so I don't have any way of testing higher bitrates.

Its just odd to me that at 4k my image is tack-sharp and then goes way soft in 1080-120. it only happens in slow. Its still sharp at 24/30 in 1080.

any suggestions would be appreciated!
 
This is kinda how the 120fps works on the C200 unfortunately. It's using the full sensor but doing some sort of line skipping to get down to 1080 and you end up with an image that is visibly less sharp than the 4K image. The CFast won't make a difference - the slow motion mode is an MP4 / XF-AVC affair only and therefore, only uses the SD cards.

The compromise might be to shoot 4K 60p and slow it down on your timeline to your project's frame rate. I've done that and gotten great results.
 
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I don't have a C200, but I might suggest that the actual 1080p 120 is soft and it isn't an issue with focus. To test, stop down so that everything is in focus, and then record a chart at 4K and at 120 fps. It will give you a sense of how soft the 120 fps actually is.
 
Dustin Svehlak said:
This is kinda how the 120fps works on the C200 unfortunately. It's using the full sensor but doing some sort of line skipping to get down to 1080 and you end up with an image that is visibly less sharp than the 4K image. The CFast won't make a difference - the slow motion mode is an MP4 / XF-AVC affair only and therefore, only uses the SD cards.

The compromise might be to shoot 4K 60p and slow it down on your timeline to your project's frame rate. I've done that and gotten great results.
Click to expand...

This is what I thought, seeing that the camera doesn't crop for 1080. Good to know that slow-mo only uses the SD cards as well. I'll be relying on shooting 4k 60 now I guess... Which is fine, less menu fighting while I'm out shooting, esp any ENG stuff.


cpreston said:
I don't have a C200, but I might suggest that the actual 1080p 120 is soft and it isn't an issue with focus. To test, stop down so that everything is in focus, and then record a chart at 4K and at 120 fps. It will give you a sense of how soft the 120 fps actually is.
Click to expand...

This is basically what made me think the 1080 was soft in camera. I shot at f/9 (being in a studio with some nice overhead 2Ks) 4K-23.98 crisply in focus, then switched over to 1080-120 without changing stops, focal length, setup. and watched the image quality fall apart. I'll probably grab a few shots at different (wider) stops and see how the results look. I was just worried that my lens was bad. I had a lot of work in finding a cost effective 24-70/2.8 that actually let the face detection work. The G1 series does but the G2 does not on that specific Tamron.

Thanks for the info though this is a big help, as google searches and forum searches provided nothing that covered this specifically.
 
cwr89 said:
Thanks for the info though this is a big help, as google searches and forum searches provided nothing that covered this specifically.
Click to expand...

You won't find much written about Canon's 120p because most people consider it useless for anything where image quality is important. It is just dismissed out of hand.
 
I agree, just use 4K 60p and optical flow or Twixtor. Surprisingly the 120p from my cheap Fuji XT-3 is MUCH better and sharper, it's actually usable.
 
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