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1080p24 & 1080p60 on NEX-5N

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Maarten Schwartz
1080p24 & 1080p60 on NEX-5N
on Dec 15, 2011 at 7:36:57 pm

Hi everyone,

My first post here since I've recently started shooting video w/ my Sony NEX-5N.
I don't know everything there is to know about video, so bear with me. Let me know if I'm stating the wrong things!

From what I understand it is preferable to have a shutter speed of 2 x Framerate, e.g. 1/48th for 24fps and 1/125th for 60fps. The camera shoots 1080p60 and 1080p24, both via the AVCHD container. AVCHD does not support 30fps.

On the old(er) NEX-5, the 1080i60 footage was ACTUALLY 1080p30 in a 60i wrapper. When dropped into FCP, it would recognize it as 1080p30. However, the NEX-5N (correctly) shoots 60fps interlaced 1080i. So when I use this footage, it's interlaced.

Some of this can be read in this post on DPReview.com: http://forums.dpreview.com/forums/readflat.asp?forum=1042&thread=40007788&p...

Most important parts from that conversation:

Michael Reichmann of Luminous Landscape has just confirmed to me in an email (I emailed him the question yesterday), that the NEX-7 also does 60I (Interlaced) NOT 30P in a 60I wrapper.
Which is what I'm seeing on the NEX-5N also

One of the few people who got it in that same conversation proposed this solution:

So I have three options I guess:
1. Record in 60i and transcode to 30p on FCPX.
2. Record in 60p and transcode to 30p on FCPX (less loss than #1).
3. Record in 60p and bite the memory bullet.
Assuming I go with #2, I'm still struggling with the shutter speed. Normally for 60p you want the shutter speed to be 1/125. But if I'm shooting in 60p with the intention of transcoding to 30p, notionally I suppose by dropping every other frame, should I be using 1/60 as my shutter speed?


My main worry is not with storage space, but with shutter speed. I'd like to be able to use that as a variable when shooting too, by shooting both 30p and 60p footage at 1/60th and 1/125th, respectively.

Is it correct that, going with his 2nd option, I'm still shooting 1080p60 @ 1/125, not 1/60? Thus, no advantage?

Can the 1080p24 come to the rescue here, allowing me to shoot @ 1/50th? Will the 1080p60 and 1080p24 play nice in FCP?

I realize that fast prime lenses can bail me out of this situation, but shooting low light it'd be nice to shoot at 1/50th, even w/ a 50mm f/1.4 if I don't need 60fps.

Sorry 'bout the long post there! Hope you guys can help me out!

-Schwartz


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