Search found 38 matches
- Sun Jan 02, 2022 10:29 pm
- Forum: Off Topic
- Topic: Happy New Year!
- Replies: 1
- Views: 5452
Re: Happy New Year!
Happy new year to you too.
- Fri Jan 03, 2020 9:43 pm
- Forum: Beginning Holography
- Topic: Blackening the emulsion for reflexion holograms
- Replies: 10
- Views: 15703
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.
The blackening agent did work quite well.
- Thu Jan 02, 2020 12:28 am
- Forum: Beginning Holography
- Topic: Hologram Equipment basics
- Replies: 8
- Views: 11223
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...
- Wed Jan 01, 2020 11:33 pm
- Forum: Beginning Holography
- Topic: Blackening the emulsion for reflexion holograms
- Replies: 10
- Views: 15703
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.
It did work and as far as I can remember, the film fizzes when placed in the solution.
Steven.
- Thu Nov 07, 2019 8:58 am
- Forum: Off Topic
- Topic: Anybody still here?
- Replies: 19
- Views: 14534
Re: Anybody still here?
I'm still here too.
Steven.
Steven.
- Sat Aug 31, 2019 2:54 am
- Forum: DCG
- Topic: Nice tutorial on YouTube
- Replies: 2
- Views: 11842
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...
- Mon Oct 22, 2018 1:29 pm
- Forum: Beginning Holography
- Topic: Drying marks
- Replies: 1
- Views: 5256
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...
- Mon Sep 03, 2018 6:31 pm
- Forum: Events, announcements, and news
- Topic: Proceedings of the 2015 ISDH
- Replies: 3
- Views: 20402
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...
- Mon Aug 13, 2018 5:16 pm
- Forum: Gallery
- Topic: Chinese figurines and random stuff
- Replies: 4
- Views: 8532
Re: Chinese figurines and random stuff
Nice job pluto.
Narrowband and low noise.
Narrowband and low noise.
- Tue Jul 17, 2018 7:01 am
- Forum: DCG
- Topic: coating help needed
- Replies: 9
- Views: 27354
Re: coating help needed
I think you must be right. Film thickness is dependant on coating speed.
I think it's based on some kind of curtain coating (http://holotec.de/Produkte_und_Dienstle ... index2.htm).