BarcampCHS 2011

BarCamp 2011 poster

This isn’t the final version, but it’s pretty close. Thanks to Seth Deitch for creating it for us!
BarcampCHS is still looking for sponsors and volunteers, so if you’re interested in helping out contact us.

Yes, TheDigitel is spelled wrong. I told you it wasn’t finished yet.

Unboxing an Old One

In the mail today there was a package. A smallish package, but a highly anticipated one (by some).

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Removing a page torn from a volume of the California Law Review revealed Orange Cthulu from @cthuluchick!

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Orange Cthulu rose out of his box to survey his new domain

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and meet two of his new subjects

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One of them had other ideas though

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Sleeping Nala

The positions I sometimes find the dogs sleeping always amuse me

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Playing with filters

In my Cabinet-o-Gear at work, I found a couple of old darkroom safelight filters. One of them is an amber/brown Kodak #6B filter, and the other is a green one.

According to this Kodak document, the brown 6B filter is used for blue-sensitive x-ray film with transmission bands between 560-660 nm (a fairly wide band covering green to orange) and > 740 nm (getting into the infra-red).

The green one (it’s not marked but I’m guessing it could be a Kodak 7B) has a transmission band between 500-580 nm (covering most of the green band of the spectrum). It transmits the light from my green laser pointer (532 nm) pretty well, but completely blocks my red laser pointer (625-680 nm).

I thought it would be interesting to see what my camera saw through the filters. They’re pretty old and a little beat up so they don’t exactly have the best optical qualities but they still created some interesting photos.

The images with the green safelight filter look pretty neat

Green safelight filter

Green safelight filter

The brown filter produces a neat look

Brown safelight filter

Brown safelight filter

The green filter images turned out a lot brighter than I expected for a band pass filter. Most digital camera sensors use RGB Bayer filters to produce colour images which explains the higher than expected sensitivity with the green filter.

I’ll have to see if I can clean and polish up these filters and play with them some more.