Re: Use of X-ray film: technical discussion with example images
I don’t think a red laser would be a good choice for a darkroom light: too bright, too focused. Lasers want to be linear. A few watts of laser light would be extremely dangerous because of the focused nature. Light bulbs radiate in all directions, so they don’t get dangerous at a few watts. Laser pointers are 1/1000th of a watt or so, I think. This thread has at least one discussion of LED low power red bulbs as darkroom lights. I’m pretty sure you will need to order them from a special dealer on line.
Re: Use of X-ray film: technical discussion with example images
Eye protection was one of my concerns. Therefore my question if pointing the Laser to the ceiling or otherwise dipsersing it would still leave it dangerous?
The big advantage is ofcourse the exact wavelenght.
Laser modules are all over the place on eBay and Aliexpress. Different powers, different wavelenghts. I thought buying one that is less powerfull. I saw some that are offered without focusing lens, specially mentioned that they are for wide radiation. It is true those are mostly for IR, intended as IR luminators for IR googles.
I will post some links later.
As a first try I could see how a laser pointer works. (Especially how to disperse it.) But there I do not know the wavelenght. Did anybody already tried this?
Re: Use of X-ray film: technical discussion with example images
A Laser is always dangerous
It can reflect
just don't
kill eyes
Re: Use of X-ray film: technical discussion with example images
Well, in the end it is just light. If not concentrated, how does it affect your eyes? The things are in discotheques (clubs they call them nowaday) and there they are a concentrated beam, still approved for public use.
Re: Use of X-ray film: technical discussion with example images
What I find online, is that the red lasers today are limited to about 5mw, which is very low. You can get a bag of 20 for low price, this is much more expensive than the red led bulbs I referenced and am using and there is no advantage for darkroom use. The focused beams could like fog film. Used indirectly, laser speckle is a real problem.
I did see violet/blue 405 nM lasers available for $20 that are 100mW. Those would work for dichromated gelatin holography within the limits of their short coherence length.
Anbody interested in holography? Not me anymore but have at it.
Alan Townsend
Re: Use of X-ray film: technical discussion with example images
I went to Chicago's HoloGram Museum some years ago
2 Attachment(s)
Re: Use of X-ray film: technical discussion with example images
Hello.
AGFA mamoray hdr-c plus.
cut to 4x5
I do not have much experience in using Agfa, but maybe someone will be interested...
Attachment 240980
ISO 50, Kodak D-23 1:1 9 min. in Jobo 2500 constant agitation.
Attachment 240981
ISO 50, Kodak D-23 1:2 5.5 min. in Jobo 2500 constant agitation.
Re: Use of X-ray film: technical discussion with example images
I see X-ray film has gone up about $12 a box and there is no longer a discount for case lots.
Re: Use of X-ray film: technical discussion with example images
Still very cheap Ortho
Stock up
Quote:
Originally Posted by
j.e.simmons
I see X-ray film has gone up about $12 a box and there is no longer a discount for case lots.
Re: X-ray Film example and comparison.
I just bought the ISO 10 Orthochromatic film from B&H and am trying to locate developing times for PMK Pyro. Anyone have anything on this combo?
Thx,
David
