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NickSpiker — Flow
Published: 2012-01-06 06:20:49 +0000 UTC; Views: 403; Favourites: 16; Downloads: 0
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Description
Technical detailsB=400-500nm
G=500-650nm
R=650-850nm
30 minute exposure
Basically this is an expanded view of what your eye sees, spectral and duration.
The sky had little puffy clouds in it but over the course of 30 minutes they basically all blended into white.
You may notice the ice in the bottom left corner. Because ice blocks more IR than visible it has a cyan cast.
I kinda wish the sky was a clear blue. This demonstrates that even the few clouds in the sky dominate over the blue in a long exposure.
Please comment if you have any questions.
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Comments: 16
This is beautiful!! I love how soft the water looks!!
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For sure
Lots and lots of time
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well chosen shutter speed, those background trees look almost autumny.
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Thanks!
It was a bit windy so there was some movement in the trees.
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Extraordinary, Nick. This is with your hand-built camera? If I were lecturing on quantum physics or the mathematics of chaos, I might want to use this as an example of how apparently random chaotic motion of tumbling fast moving water resolves over time into rhythmic bands. I also appreciate the red channel with its IR component showing the foliage with a russet hue. This is what I have found when I substitute an IR shot for the red channel.
Very, very interesting all round. Just what I was hoping for for the re-vamped group. I've copied it to the Experimental folder - more people will look.
Cheers
David
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It was taken with my Sigma SD14. I really like the spectral response of the stacked Foveon sensor design, it's a lot smoother response curve than the Bayer design.
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Nick - With the SD14, presumably you have to buy the different filters to fit in? Is it easy to change them? It looks a tempting but expensive buy.
Cheers
David
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It's actually really nice because the stock Sigma camera comes with a user removable hot mirror so it's ready to shoot UV, Vis, IR right out of the box and if you don't shoot with any filter in front of the lens you get standard color, in fact, the spectral response is closer to the human eye than any other camera on the market. When you pull the hot mirror [link] you get the above mentioned spectral responses from the 3 channels with no external filter required. Red channel is almost entirely IR right out of the box. Just a smidge of red in there but you can hardly tell in comparison to a 720nm filter. I do own a crap ton of filters but none were used for this shot. [link]
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This is fascinating stuff, Nick. I can see why the Foveon and Sigma approach is so powerful. Are there second-hand SD14's available or are there any problems that I should look for if I saw one?
Can you post the Filters shot into the Group - Resource/Tutorial folder perhaps? That would be very useful.
Many Thanks
David
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They are pretty readily available, the SD9 and SD10 had a few problems so I would recommend a SD14, SD15 or SD1. They are less mainstream cameras though so they lack in features and speed. They make up for these drawbacks in my opinion because of their ability to sense all colors at each pixel location and their clean even spectral response. They also work great for shooting UV.
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