
This is my best dichromated gel hologram sofar.
While they are very bright... they are also broadband, so the image gets blurrier as it gets deeper. You can see the texture of the shell on its points where they were sitting on the plate, but even an inch in, its fuzzy.
Note the shadow on the right side. It was caused by the wood the shell is sitting on moving 1/2 a wavelength.
While they are very bright... they are also broadband, so the image gets blurrier as it gets deeper. You can see the texture of the shell on its points where they were sitting on the plate, but even an inch in, its fuzzy.
Note the shadow on the right side. It was caused by the wood the shell is sitting on moving 1/2 a wavelength.
Category All / All
Species Unspecified / Any
Size 1280 x 1082px
File Size 97.1 kB
I mold coated this one. On the one hand, mold coating (between two pieces of glass, one coated with rainx, with scotch tape for a spacer) is definately more consistant, but it also uses a lot of gelatin (which squishes out when you put the glass together) and when you peel the mold apart it leaves a pattern like a finger print on the gelatin.
Thanks!
The depth of field of a hologram is a different effect from a camera lens... Its actually a function of how wide a range of wavelengths the hologram is reflecting. Different wavelengths reconstruct an image at a slightly different location (and size). All wavelengths line up on the plane of the hologram, then the offset between wavelengths increases with the depth into the hologram. If the hologram only reflected a narrow range of wavelengths, the image would be sharp. You can get the same effect by looking at a hologram with narrow bandwith light source like a laser. This hologram reflects a wide range of wavelenths, so it gets blurry fast.
My holograms on silver halide emulsions are much narrower bandwidth, and thus much sharper.
I'm attempting to tune this process to not be so broad bandwidth, but then they are dimmer... So you can't win.
The depth of field of a hologram is a different effect from a camera lens... Its actually a function of how wide a range of wavelengths the hologram is reflecting. Different wavelengths reconstruct an image at a slightly different location (and size). All wavelengths line up on the plane of the hologram, then the offset between wavelengths increases with the depth into the hologram. If the hologram only reflected a narrow range of wavelengths, the image would be sharp. You can get the same effect by looking at a hologram with narrow bandwith light source like a laser. This hologram reflects a wide range of wavelenths, so it gets blurry fast.
My holograms on silver halide emulsions are much narrower bandwidth, and thus much sharper.
I'm attempting to tune this process to not be so broad bandwidth, but then they are dimmer... So you can't win.
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