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Slow motion hypotrich

 
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 17874
Location: Richland, Washington State, USA

PostPosted: Wed Dec 27, 2006 9:40 pm    Post subject: Slow motion hypotrich Reply with quote

I played around with some slow-motion video this afternoon, using the "Fast Frame Rate" capture mode of my Canon SD700 IS. That's 320x240 pixels at 60 frames per second.

Here's a single frame from a short video of an unusually cooperative hypotrich, showing what I take to be the undulating membrane and three anterior cirri.



The video, slowed down to 7.5 frames per second (1/8 speed) can be found here (2.6MB, DivX format avi).

I question whether 60 frames per second is actually fast enough to resolve the motion of these cilia. I find it very odd that the wave seems to be moving clockwise, while debris in the water is obviously being swept rapidly down the left side -- counter-clockwise. I suspect temporal aliasing (strobing), like the old wagon-wheel-runs-backward effect. Does anybody here know the actual motion and period of oscillation for the cilia?

--Rik
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Charles Krebs



Joined: 01 Aug 2006
Posts: 5671
Location: Issaquah, WA USA

PostPosted: Wed Dec 27, 2006 11:07 pm    Post subject: Reply with quote

Hi Rik.... fun stuff

You are seeing the "strobe" effect you mentioned. 60fps just doesn't cut it for this. Don't know what would be needed
(200fps would be a start Wink )
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 17874
Location: Richland, Washington State, USA

PostPosted: Wed Dec 27, 2006 11:37 pm    Post subject: Reply with quote

Hi Charlie!

Frustrating, frustrating stuff!! Cameras too slow, no DOF to speak of, and when the critters are doing anything interesting they're usually running around too fast to track. Sheesh! A guy would have to be crazy to spend valuable vacation time like this!! Aarrgghh!!!!

(He exits, stage left, still screaming, muttering something about frame rates and bandwidth...) Rolling Eyes

--Rik
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Ken Ramos



Joined: 27 Jul 2006
Posts: 6947
Location: lat=35.4005&lon=-81.9841

PostPosted: Thu Dec 28, 2006 3:32 am    Post subject: Reply with quote

Rick said:
Quote:
(He exits, stage left, still screaming, muttering something about frame rates and bandwidth...)


I do the same thing when tying size 32 midges with 6/0 silk when I should in all actuallity be using 8/0, just ain't enough room on that little hook #@#!#@ it! Laughing Good video there Rik. This is one thing you guys are going to get me to try sooner or later. Very Happy
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Ken 2014
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