SxS still has its place

GuyB

GuyB

Well-known member
I know its stating the obvious, but full speed overcranking has its uses. I have just finished putting together a short dance portfolio for a young ballet dancer and took some slow mo of him doing some of his faster moves for a nice little intro piece. Being in PAL land I used 720 25p @60fps to get maximum slo mo effect.

Now KxS might have worked but it is pushing reliability of recording and I didn't want to ask him to repeat a move because of a media error (especially in front of the teacher).

They loved the result anyway, next time I have to remember to turn the shutter on though, I can see a strange multiple exposure effect in frames but it looks absolutely fine in playback.

The sodium vapour lamps caused a bit of strobing though, so I coverted to an old film look and the flicker actually added to the old film effect, looks pretty nice in the end.

PS: The other reason SxS has its place was because I left my SD card holder at home but still had my SxS cards in the camera case! phew...
 
That's right :)

Hey Guy, one question, why not shoot in 720/60p (to get sound) then slowing down to 25p in post? Is there any other drawback other than not being able to properly review the clip (as it would be after post) after recording?

Another thing, this is obvious but never hurts to check... shooting 720/60p is also considered overcranking, right? What was exactly the cause of failure when overcranking? Has anyone tried XxS with 720/60p?

Leave you one clip: http://exposureroom.com/members/IGV.aspx/assets/c8e44d1478114ece8f9666bd08078118/
 
Shooting at 60p is different to shooting overcranked to 60p not just in the fact that playback speed is natively different. When overcranking to 60p, you are shooting at higher than 35Mbps, based on 25p you are shooting at 60/25 x 35 = 84Mbps. Basically, what happens is for every 25 frames the camera records 35Mb, and there are 2.4 sets of 25frames each second when OC to 60fps.

In the end the compression is much less using overcranking than shooting 60p and slowing down in post.

I didn't need the audio, it was always going to have audio dubbed over it anyway.

Edit: And they loved watching it play back in slo mo in the LCD then and there too.
 
Oh ok, I get it now. 0,583Mb per frame vs. 1,458Mb sounds like a big difference, can this really be noted? Tomorrow I'll run some tests.

So this means I can record HQ 720/60P with XxS? Yahoo :D ! I hope those tests don't make me think it isn't worth it.

Thanks for the answer!
 
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When played at 60p I bet you won't really notice the difference in quality by the lower data rate per frame but if you have decent motion in what you are capturing (sort of the reason for slow mo isn't it?), if you slow mo the standard HQ 60p to 25p I am pretty confident you will see the difference in compression.
 
Re shutter - Just got my first gig on the EX1, ended up being a corporate gig.. great for testing the camera.

One thing i discovered and find very weird is when shooting progressive (i shot 720 25p) you NEED to have shutter on.. or else it defaults too 1/25... a bit dumb in my opinion.. Turn it on, throw it too 180 degrees.. and you'll be good to go, no matter what frame you've overcranked too, 180 is a sweet spot.
 
I see a lot of people using the degree setting as opposed to the shutter speed setting......whats the advantage??
 
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