Holographyforum.org / holowiki.org

If I understand it correctly, both Dinesh and Jeffrey talk about embossing. Is it the only way how to produce hologram copies? What about very simple optical transfer? Make e.g. glass silver halide or DCG master and then - using quite simple machine - make common H1-H2 transfers to a roll of a suita...

Hi, Dinesh, I agree with you in most points. Today, there are alternatives to holograms, such as lenticulars, that are cheaper and have some other advantages. On the other hand, I have never seen anyone to be fooled with lenticulars. I have a small collection of holograms for educational purposes, a...

Hi, I have a different view on the subject. Let us compare holography and photography. Photography was invented, say, in 1820's and it took about 50 years to evolve somehow, and maybe another 50 years to become really widespread. In the beginning, only technical geeks were interested. Then people be...

Hi, Dinesh, I think I understand that you cannot use Whittaker-Shannon on the eye because of the limited number of elements in the spanning set. Whittaker-Shannon states that a signal in the time domain (let's stick with the time domain) can be reconstructed from samples taken in the time domain - u...

Hi, Dinesh, I would not incorporate Whittaker-Shannon in the ear/eye mechanism as there is no sampling in time domain, of course. Both the inner ear and a single rod/cone in the retina do in fact windowed Fourier transform. In the inner ear, there are several hundreds of "detectors", one f...

Wow! Very impressive and fastidious work! It does show the increase in sensitivity that TEA does generate as you set out to prove! Thanks! :-] Your report also shows how superior the BB plates are compared to the Harman Technology. It seems so for reflection. However, I also don't like the TEA step...

Hello all, here you can find a slowly growing test results report for different materials (currently only BB640 and Harman HoloFX Red), different processing schemes and different exposures. Not as big as Ed's, but perhaps you find it useful. http://holo.zcu.cz/txt/materials_report.pdf Enjoy! Petr Wh...

Thank you very much for posting, Ed!

Just curious: Colour Holographic recommends soaking in 1% TEA for presensitisation. Did you have any reason to replace this step with Photo-Flo (other than you had a lot of Photo-Flo?) I don't understand the chemistry behind, sorry for maybe silly question.

Petr

Great quiz, Ed! A week ago I did a small holographic exhibition (mainly for schools) and I wish I had similar idea!
Petr

Hello, congratulations to your first hologram! There are two points that can be made better. First, check spectral sensitivity of the plates. I believe you have a holokit with PFG-03M plates (check it on Integraf site). The spectral sensitivity is available at http://www.geola.lt/lt/holography_mater...