Keep Them Shutters Rolling, Rawhide!

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Gav shows you how insanely quick the inside of a DSLR camera moves when it takes a picture, by filming it at 10,000 fps.

Camera filmed is a Canon 7D.
This video is a good demonstration of how a rolling shutter works.
Shot with a Phantom Flex at 10,000fps

3D, but not Greased

3D Lightning

Having two pictures of the exact same lightning bolt lets you do something pretty amazing; reconstruct its path in 3D. In this case because the precise location and elevation of the photographers isn’t known this is slightly more art than science, but it is still fun!

I Can See Right Through You

Having some more fun with my thermal camera (after a cold kept me from it for a bit). I had noticed that my lunch did not show up while being microwaved, because long-wave IR generally doesn’t pass through glass — here’s another image confirming this

You can’t see the thermal signature of my hand that’s behind the window. This is, of course, responsible for the greenhouse effect — visible light goes in but thermal IR does not leave, making the greenhouse (or your car, or, with a more wavelength-selective effect, the planet) get hotter.

I wanted to see if I could find anything that was transparent. I checked the transmission of sapphire and discovered it was a possibility — the transmission cutoff is out at 5 microns. Alas, the windows were opaque, meaning either that the windows I looked at were antireflection-coated (a distinct possibility), or that the bolometer sensors aren’t sensitive at the shorter wavelengths. But the plastic bag this window is in transmits just fine!

It’s probably made of polyethylene, which has good transmittance in much of the thermal range — just a few absorption lines (at about 3.5, 6.5 and 13 microns). We happen to have some 1/16″ thick poly sheets, we use for our air sled to allow it to work over porous surfaces, and are opaque to visible light. But not to thermal IR!

You can see a couple of spots where I touched the sheet with my fingertips and warmed it up, but in the picture my hand is behind the sheet and not touching it.

That's So Hot

Finally got my FLIR One thermal-IR camera working (the issue was with the phone to which it’s attached), and it’s amazing.

This is my kitchen sink, with a bowl full of room-temperature water in it, along with some utensils, and the water on hot, aimed so it hits the basin rather than going straight into the drain.

Turning Up and Turning Down and Turning In and Turning 'Round

I want a doctor to take your picture
So I can look at you from inside as well

Stop-Motion Animation Reveals the Insides of Objects Sanded Down Layer by Layer

Laurin Döpfner … used an industrial sander to grind down logs, electronics, and even a skull in thin layers which he then photographed to create this amazing stop motion video. Each object is comprised of about 100 different photos

I like the walnut the best, I think.

A Stitch in … Photoshop

Why does the Milky Way look curved?

Let me pose the following question to you:

How is it possible to get two points in the sky — 180 degrees apart — into the same image?

It’s not possible, not unless you distorted something along the way! In this case, we had to distort the composite, stitched-together image in order to display the entire path with a flat horizon! This is a complicated task, similar to the reason why it’s impossible to make a flat map of a sphere that simultaneously has all the properties you’d desire!