What kind of photography was I doing?

02/11/2005 09:50:46 PM · #1

I thought I would give people a puzzler to work on, it is to try and figure out what kind of photography I was doing back in the late 70s. I will be adding hints until somebody gets what form of photography it was.

I will say that is uses silver based emulsions like normal BW photography and normal developers. I will also say that I was doing this are part of my job.

The first hints are that if you have half the photo you still have the whole and if you have half of one of the halves you still have a whole and so forth for quite a while. No one could sit still long enough for me to take their portrait even though the exposure might only be 10 seconds long (any number of people wanted me to try).

So what type of photography was I doing.

More hints to follow.

mycelium

Canon EF-S 10-22mm f/3.5-4.5 USM

02/11/2005 09:55:31 PM · #2

well, I know that one of the most interesting features of holograms is that any part of a hologram contains all the image information of the entire thing. So, my guess is that you were doing holographic photography.

But I am far from sure.

edited to add: if it were holographic, that would also explain the wide interest in it. after all, who wouldn't want to have a holographic image of themselves?

Message edited by author 2005-02-11 21:56:36.

02/11/2005 10:00:22 PM · #3

Originally posted by mycelium:

Man that did not take long, very good!!!

Yup you only need a small piece of a hologram to get the entire image. A piece 1 mm square will do the trick.

I shot 4 x 5 glass plate, we are talking very hi-res images, past what any normal camera can come close to.

The reason no one could sit still long enough for a portrait is that they had to keep still to less then a micron otherwise the image would not from.

02/11/2005 10:07:02 PM · #4

Originally posted by mycelium:

edited to add: if it were holographic, that would also explain the wide interest in it. after all, who wouldn't want to have a holographic image of themselves?

Everyone wanted me to try and take their hologram but to do so you need a pulse ruby laser, I had a HeNe which took far to long. To get a hologram of a person we are talking about exposure times of less A millionth of a second.

I did shot my arm just for fun, what you get is a 3D black arm where the arm should be, pretty odd looking.

This was fun to do as a job but I was glad I was not paying for the plate, they were around $4/plate. But then they could resolve around 80,000 lpi, and for a number of reason the film would not be that good in a normal camera.

The film was also slow, one of them had an asa of like 0.04

mycelium

Canon EF-S 10-22mm f/3.5-4.5 USM

02/11/2005 10:29:59 PM · #5

yay I win!!!

wow... sitting still to the micron... one would think that that would require not even having a pulse. but i guess if you have the equipment to make an exposure for less than 1/1000000 second, a pulse might be okay. has there been much success in making holograms of people?

asa 0.04.. is that like ISO?

Sony 24-70mm F4 Vario-Tessar T* FE OSS

02/11/2005 10:43:37 PM · #6

Originally posted by mycelium:

There are quite a few holograms of people, my favorite is someone falling backwards off a chair, it was show on a large piece of glass, the size of a window, pretty weird looking.

asa is what ISO used to be called. ISO was suppose to have both the ASA number and the din number, but nobody bothers with the din, so now ISO is just what we used to call ASA.

With the HeNe we could not shoot anything that was living.

Mostly I used it for vibration testing, the vibration modes show up great in a hologram.

Bear_Music

Samsung Galaxy S24 Ultra

02/12/2005 01:00:50 AM · #7

ASA was, I believe, "American Standards Association", and ISO is International Standards Organization. Kinda melded upwards. Originally we had ASA and the rest of the world had DIN, ISO replaced both as an international standard.

Unless I am "selectively remembering" this...

Robt.