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Nick Hope

Member Since 12 Sep 2004
Offline Last Active Aug 26 2016 04:49 PM
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Posts I've Made

In Topic: Tozeuma juvenile? What species?

25 August 2016 - 07:35 PM

Tozeuma lanceolatum I think. The spot on the tail fits, and the spots on the side are sometimes very feint.

In Topic: Slow motion from Mediterranean

17 August 2016 - 05:34 PM

And what do you point the camera at when you manually white balance? Any colour correction filter?


In Topic: Slow motion from Mediterranean

15 August 2016 - 08:27 PM

Ha, I used to use that music track lots when I was making liveaboard DVDs. It's a cracker. Used to switch to a manta or something big when the grand strings cut in.

 

Good job. Love that big ray. What white balance mode are you using?


In Topic: ND Filter

15 August 2016 - 08:16 PM

The "norm" for video is to shoot with the shutter open for half the duration of each frame. That means 1/120 if you're shooting 60 fps. 1/100 if you're shooting 50 fps. 1/60 if you're shooting 30 fps. 1/48 (or 1/50 if that's all that's available) if you're shooting 24 fps etc.. This is alternatively known as 180 degrees, as it dates back to rotary shutters on film cameras and projectors. A faster shutter speed is possible but with movement you will get a stuttery effect, a bit like a cartoon flipbook, because less motion-blur is captured. Having said that I've published loads of video with a faster shutter than 180 degrees. With a static shot it doesn't matter. I've even used 360 degrees (1/30 at 30p) in dark situations, rather than increase the ISO. Fast shutter speeds can be good for doing slow motion in post-production, where the motion interpolators like sharp frames to work with.
 
Not sure how strobe sync is relevant to video.

In Topic: Raja Ampat on Sony AX100 4k Camcorder

29 July 2016 - 06:29 PM

BTW, just got the AX100 housing back from Gates. Guess what was broken? The 3D printed ND filter switch, along with one other similar piece whose function I can't recall.


Gates have 3D printed parts in their housings now? Really?