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Holography panel at FTM
6 years ago
I was doing paperwork this weekend (register for All The Things) and have
requested a panel at Fur the More this year for a holography panel. Its not
approved or anything, but I figured I'd mention it here anyway.
So assuming it is approved, you should show up with some interesting object
about the size of your fist, and we'll try to make a hologram of it.
There are some limits to the process, the image will be life-size and the film
is 4x5 inches, hence the "about the size of your fist" thing. The brighter the
object the brighter the image, matte white is ideal. The laser is green, so
something which is bright red will look black. And, nothing can move more than
1/10 of a wavelength (53 nanometers for my laser) so something solid, like a
shell, will work better than something light or fluffy, like a feather, which
will be blown around by air currents.
The traditional test object is a porcelain cat (seriously... see "Practical
Holography" by Graham Saxby). Something solid so it won't move during the
exposure and matte white reflective for a bright image. Thats why there are
so many holograms of skulls and dice. I've also had very good results with
people's keys, and shells.
The worst object is a fake flower. The petals blow around in air currents.
My normal test object is a toy hamster. Its not the best object, but I have good
control over air currents in my normal lab.
The whole thing must also be done in a dark room. The laser is green so I'll
have a red safe light, but visibility will be poor. I would not recommend it for
fursuiters. And stray light (EG from cellphones) will fog the film.
The rest of the process looks kind of like processing black and white print
paper. The chemistry will be in open trays with tongs. Its not especially
toxic, but don't drink it, and wash it off ASAP if you get it on you. The bigger
hazard is that it will stain when you least expect it. The developer looks
like water, but after a few hours it turns purple.
Here's the handout: http://www.bobdbob.com/~protius/HOP.....hy/outline.pdf .
Its recycled from HOPE, where I first did this panel.
requested a panel at Fur the More this year for a holography panel. Its not
approved or anything, but I figured I'd mention it here anyway.
So assuming it is approved, you should show up with some interesting object
about the size of your fist, and we'll try to make a hologram of it.
There are some limits to the process, the image will be life-size and the film
is 4x5 inches, hence the "about the size of your fist" thing. The brighter the
object the brighter the image, matte white is ideal. The laser is green, so
something which is bright red will look black. And, nothing can move more than
1/10 of a wavelength (53 nanometers for my laser) so something solid, like a
shell, will work better than something light or fluffy, like a feather, which
will be blown around by air currents.
The traditional test object is a porcelain cat (seriously... see "Practical
Holography" by Graham Saxby). Something solid so it won't move during the
exposure and matte white reflective for a bright image. Thats why there are
so many holograms of skulls and dice. I've also had very good results with
people's keys, and shells.
The worst object is a fake flower. The petals blow around in air currents.
My normal test object is a toy hamster. Its not the best object, but I have good
control over air currents in my normal lab.
The whole thing must also be done in a dark room. The laser is green so I'll
have a red safe light, but visibility will be poor. I would not recommend it for
fursuiters. And stray light (EG from cellphones) will fog the film.
The rest of the process looks kind of like processing black and white print
paper. The chemistry will be in open trays with tongs. Its not especially
toxic, but don't drink it, and wash it off ASAP if you get it on you. The bigger
hazard is that it will stain when you least expect it. The developer looks
like water, but after a few hours it turns purple.
Here's the handout: http://www.bobdbob.com/~protius/HOP.....hy/outline.pdf .
Its recycled from HOPE, where I first did this panel.
There are unfortunately a great many other reasons why a hologram will be dark... Vibration is the biggest challenge. I am attempting to reduce that issue by using a very short exposure (1/2 second). It will still be on an innertube, to reduce vibration.
Yes, thats the specific problem I'm attempting to describe... that the narrow bandwidth of the illumination makes it act like a film which is only sensitive to exactly 532 nm light.
There are unfortunately a great many other reasons why a hologram will be dark... Vibration is the biggest challenge. I am attempting to reduce that issue by using a very short exposure (1/2 second). It will still be on an innertube, to reduce vibration.