Ursa vs GH4 Slow motion

So I recently updated the firmware on my Blackmagic Ursa that now allows 150fps in 1080p

Screen Shot 2015-04-10 at 13.40.39

Since the update…a few people have responded, mentioning that they don’t think it looks as slow as 150fps

and that the GH4’s 96fps looks slower.

Tests below:

<p>

I have the Ursa and GH4 here so lets give it a test!

First off…..the 150fps looks slower then the GH4 96fps, as it should.

Besides that, the Ursa footage obviously looks more filmic, skin tones look great and not milky/blocky how they do on the GH4.

Both cameras being 1080p while using super slow motion…side by side you’d think the Ursa was 4K or 2K

As it just looks better and resolves more detail.

Gh4 is still awesome though

But do bare this in mind with the Ursa….you will lose more light then using slow motion on the GH4, plus it crops in.

non crop

crop

In the beginning of the video, light is matched evenly and looks fine.

The end of the video I shot with minimal light, even though the Ursa still looks better then the GH4.

The GH4 had much more light hitting the sensor…I could have even let more light in but would have over exposed the skin.

link if video does show up – https://vimeo.com/124925119

For now…my little work around to get more light in the Ursa sensor while shooting 150fps in doors, is to change the shutter to 360˚ rather the 180˚ and lower. The motion blur isn’t that bad and works fine for most things. If your shooting outside, then you can easily shoot 180˚ etc

Most people who often shoot slow motion usually have to light and know this

Bit more info:

 25fps @ 180deg = 1/50th sec

50fps @ 180deg = 1/100th sec (1 stop loss from 25fps exposure)
100fps @ 180deg = 1/200th sec (2 stop loss from 25fps exposure)
200fps @ 180deg = 1/400th sec (3 stop loss from 25fps exposure)
400fps @ 180deg = 1/800th sec (4 stop loss from 25fps exposure)

Who knows if the new Usra sensor will handle this better…

Don’t forget that the new Usra mini with new 4.6K Sensor will have 15 stops Dynamic Range.

Did I mention dual sensor, Global and Rolling shutter as an in camera option! 🙂

Screen Shot 2015-04-14 at 13.43.55

Not sure why a lot of companies keep missing this out, saying Usra Mini will shoot just up to 60fps, if you want more fps get the 1st edition Ursa….true!

But they keep forgetting the the Ursa mini 4.6K with 15 stops can also do 160fps in 1080p then 60fps global 4.6K, see below:

Screen Shot 2015-04-14 at 13.44.00

The original Ursa can do 120fps in 4.6K resolution with 15 stops.

I hope this clears a few things up regarding the Ursa, new Ursa mini and the slow motion questions.

I can’t wait to get hold of the new sensor and Ursa Mini!

Screen Shot 2015-04-14 at 13.44.29

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One Comment on “Ursa vs GH4 Slow motion

  1. One thing I noticed is they very sneakily changed the frame rates from 120fps at 4.6K to 100fps, and cropped mode was changed from 160fps to 120fps.

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