cazalea[Seiko Moderator]
17179
Some more comparisons, including PLT
Jun 14, 2012,16:57 PM
Hi Marcus,
While not an engineer, and incapable of running my Sony camera in any mode other than "Auto",
I thought I would take the resources I have at hand and do a comparison to complement yours.
I do have an assortment of luminous material from my amateur watchmaking practice. And an assortment of watches, including a recently-acquired Ball Fireman that is 4 years old, so nicely broken in and presumably faded. Although we have plenty of sunshine most of the time, today it's grey outside, so I set up my own bank of Sunpower. I used two incandescent bulbs (red and green), a halogen spotlight in the ceiling, a standard incandescent in a goose-neck lamp, and two fluorescent "natural daylight / full spectrum" lamps. I let them go 30 minutes.
On the table I have, from left to right, a Gerber P10 with black lume, the Ball Fireman with luminous tubes, an Ochs & Son with orange lume, an assortment of luminous material as supplied by the manufacturers, a Seiko diver that's been refitted with a "sterile" aftermarket dial, and a Seiko Solar powered watch. The Gerber at 1 year old is the newest, while the rest are at least 2-4 years old.
Here's a close-up of the material. Yes, some of it is radioactive. But old. Maybe 20 years, or more.
On the new material, you can see from the lid of the tins or bottles what color the lume inside is. I didn't pour any out as it's $25-50 per bottle.
So here is the set-up for the photos. Please use the Seiko in the back for actual times, as none of the others are set or fully-wound.
There's a little mixing cup next to the orange Ochs, in the front. It's where you mix up the powdered lume with glue.
First shot, at about 4 o'clock. I used the Sony's automatic "twilight" setting which takes 6 shots and combines them. The Ochs is astonishing here.
About 2 minutes later
another minute (you see I am not waiting 6 hours; I haven't the patience)
A bit longer, it's clear that I don't need to wait very long for the lume to fade away
And on
Notice that by now the old radium lume in the tins is almost faded, but the newer material in the bottle is still very bright
I did no processing whatsoever in these shots, except to decrease the file sizes (PuristsPro software does resizing too - and more?)
After 8-9 minutes, the newest bottle of A&F luminous material seems WAY brighter than the rest. The Seiko in the back is still doing great.
The distance from lens to materials was about 1 foot in all those shots from the tripod.
I decided to take a few more. Here's a new, 4-inch, hand-held shot of the Ball, the lume bottle, and the Gerber.
and finally, the Ball on its own, cropped in to fill the frame.
I hope this has been interesting, if not of the highest scientific value.
Cheers
Cazalea