Search found 37 matches

by Steven
Fri Jan 03, 2020 9:43 pm
Forum: Beginning Holography
Topic: Blackening the emulsion for reflexion holograms
Replies: 10
Views: 1963

Re: Blackening the emulsion for reflexion holograms

I think that the fizzing was just part of the chemical process taking place.
The blackening agent did work quite well.
by Steven
Thu Jan 02, 2020 12:28 am
Forum: Beginning Holography
Topic: Hologram Equipment basics
Replies: 8
Views: 1241

Re: Hologram Equipment basics

As for a collimating mirror, why not use a parabolic mirror designed for a telescope? I was told by an holographer many years ago that a spherical mirror was more suitable for holography, as they are often used off-axis. Maybe an optical expert can interject here? I only measured the power of my une...
by Steven
Wed Jan 01, 2020 11:33 pm
Forum: Beginning Holography
Topic: Blackening the emulsion for reflexion holograms
Replies: 10
Views: 1963

Re: Blackening the emulsion for reflexion holograms

I have tried the blacking agent you have described over thirty years ago, but I never tried it with IPA.
It did work and as far as I can remember, the film fizzes when placed in the solution.

Steven.
by Steven
Thu Nov 07, 2019 8:58 am
Forum: Off Topic
Topic: Anybody still here?
Replies: 19
Views: 5543

Re: Anybody still here?

I'm still here too.

Steven.
by Steven
Sat Aug 31, 2019 2:54 am
Forum: DCG
Topic: Nice tutorial on YouTube
Replies: 2
Views: 5174

Re: Nice tutorial on YouTube

No, it isn't easy, but it's not too difficult either. If you have suitable laser, access to a few chemicals and lots and lots of patience it can be done. Results will improve over time, once you have a few holograms under your belt and have kept a log of your failures. I don't bother with a fume cup...
by Steven
Mon Oct 22, 2018 1:29 pm
Forum: Beginning Holography
Topic: Drying marks
Replies: 1
Views: 3763

Re: Drying marks

I have not worked with silver halide chemistry for nearly thirty years, but I used to use a good quality window squeegee after the final rinse. If done properly, you should not have any droplets on the emulsion surface. I was using the Ilford red sensitized holo film at the time and a rehalogenating...
by Steven
Mon Sep 03, 2018 6:31 pm
Forum: Events, announcements, and news
Topic: Proceedings of the 2015 ISDH
Replies: 3
Views: 7904

Re: Proceedings of the 2015 ISDH

They were published, I saw a copy at ISDH 2018, but they wanted 60 Euros for them regardless of whether you were a participant or not, to cover the cost of the hologram on the cover , according to Hans. He also said that David Radcliffe had brought only 7 of them. Maybe Hans or Alkis or someone fro...
by Steven
Mon Aug 13, 2018 5:16 pm
Forum: Gallery
Topic: Chinese figurines and random stuff
Replies: 4
Views: 5313

Re: Chinese figurines and random stuff

Nice job pluto.
Narrowband and low noise.
by Steven
Tue Jul 17, 2018 7:01 am
Forum: DCG
Topic: coating help needed
Replies: 9
Views: 7805

Re: coating help needed


I think it's based on some kind of curtain coating (http://holotec.de/Produkte_und_Dienstle ... index2.htm).
I think you must be right. Film thickness is dependant on coating speed.
by Steven
Mon Jul 16, 2018 9:53 pm
Forum: DCG
Topic: coating help needed
Replies: 9
Views: 7805

Re: coating help needed

ahgu wrote:
Sun Jul 15, 2018 10:10 am
Anyone how the idea behind this coater?
coat.PNG
Hi ahgu, I suspect that it is using a Doctor Blade. Something like this:
https://www.youtube.com/watch?v=f0OfjqKQwXg

Steven.