Search found 402 matches
- Tue Feb 09, 2021 10:07 am
- Forum: General Holography
- Topic: Nick Brandreth’s Lippmann Plates
- Replies: 2
- Views: 81
Re: Nick Brandreth’s Lippmann Plates
I notice in these videos that the round viewing aperture is also recorded into the image. I wonder if that means that the Lippmann photograph recorded the three dimensional position of the lens used to focus the image onto the plate?
- Tue Jan 19, 2021 10:07 am
- Forum: General Holography
- Topic: Mounting Photopolymer Film
- Replies: 3
- Views: 140
Re: Mounting Photopolymer Film
Here's a sample, on 50x75mm glass. It's a recent HOE, with a palindrome number.
- Tue Jan 19, 2021 9:52 am
- Forum: General Holography
- Topic: Mounting Photopolymer Film
- Replies: 3
- Views: 140
Mounting Photopolymer Film
An easy way to mount photopolymer film to glass plates is to use a pouch laminator. The one I've used since the mid-1990s is the Ibico GL-9, often still available on Ebay. They were made first in Mexico, then in Korea. Be certain to get one made in Korea (it is mentioned on the label on the bottom),...
- Sun Nov 08, 2020 9:13 pm
- Forum: Beginning Holography
- Topic: Holographic Optical Element (HOE) of simple reflection mirror
- Replies: 13
- Views: 1279
Re: Holographic Optical Element (HOE) of simple reflection mirror
System #2 if you don't have a stable table. System #1 if you do, and want best results. Both will work fine. Others may say system #2 gives best results.
- Wed Oct 21, 2020 9:18 pm
- Forum: Optics
- Topic: Question About Cylindrical Holograms.
- Replies: 2
- Views: 1388
Re: Question About Cylindrical Holograms.
You have it essentially right, but in practice a computer generated image would be used (instead of a sculpture), and that image would be digitally predistorted to give you what you want. There would also be a huge problem with lighting the resulting film, unless the reference beam used to make the ...
- Mon Oct 19, 2020 8:20 am
- Forum: Beginning Holography
- Topic: Horizontal stripes - along same depth, like ISO lines...
- Replies: 17
- Views: 1116
Re: Horizontal stripes - along same depth, like ISO lines...
My favorite tape too, and a "must have" for any hololab. You're right about edge "ringing" from cards used to mask edges, but if they are only a few inches away, the issue is minimized. Also, I'd worry about tape touching photopolymer that's only very lightly attached to the glass. If one uses ink o...
- Sun Oct 18, 2020 2:40 pm
- Forum: Beginning Holography
- Topic: Horizontal stripes - along same depth, like ISO lines...
- Replies: 17
- Views: 1116
Re: Horizontal stripes - along same depth, like ISO lines...
Those lines can form from reflections off the bottom edge too. I like to use cardboard masks to block light from hitting the edges. Nothing to clean. Really nice to see such good results with that material after four years! Especially with a darkish subject. I think the "iso lines" you mentioned at ...
- Sun Oct 18, 2020 8:58 am
- Forum: General Holography
- Topic: RGB tests with HX200 photopolymer
- Replies: 17
- Views: 1382
Re: RGB tests with HX200 photopolymer
The one I use does not have an LED light on the nose.
- Thu Oct 15, 2020 10:38 am
- Forum: General Holography
- Topic: RGB tests with HX200 photopolymer
- Replies: 17
- Views: 1382
Re: RGB tests with HX200 photopolymer
Tank of nitrogen.
- Thu Oct 15, 2020 8:52 am
- Forum: General Holography
- Topic: RGB tests with HX200 photopolymer
- Replies: 17
- Views: 1382
Re: RGB tests with HX200 photopolymer
First, I do it in a dedicaterd area that's kept clean. I use an anti-static airgun (pictured below) to blow the dust off the glass plate first. That keeps dust from being attracted to the surface. Then I use a small laminator I got and modified 20+ years ago to put the film down. Finally, I trim wit...