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  • Welcome to the new site. Here's a thread about the update where you can post your feedback, ask questions or spot those nasty bugs!

If you have not enough light - amplify it!

Dr Klaus Schmitt

Active member
Well, if you find yourself in a situation that there is not enough light to do for instance reflected UV photography,
you have to either get no results or if you are willing to reduce resolution, use a light amplification device, such
as a MCP system (Multi Channel Plate) which come also in a UV capable version. The result is monochromatic
(green usually) and using a suitable relay lens system can be projected to a camera sensor.

I was playing around a bit with such systems, so here a few test shots all using a 350nm peak UV filter with OD6 IR suppression:

Tea candle(s) which is a difficult to record combustion process:




Rudbeckia flower with typical UV pattern:


Roof at evening with 50mm lens:


Roof at evening with 250mm lens:
 

Dr Klaus Schmitt

Active member
How expensive and bespoke is the unit.....Does it care about the light wavelength?
Well if I add all up it is rather expensive new around $21.000, if you know what you need and where to find it used and not afraid to have parts machined, $2-3.000 will do.
The light wavelength is determined by the filter used, works from deep UV to near IR.
 

Asher Kelman

OPF Owner/Editor-in-Chief
What’s the multiplication factor?

I guess that depends on the wavelength as diverse filters will behave differently!

Is the efficiency increased with the increase in eV of the light?

Asher
 

Dr Klaus Schmitt

Active member
What’s the multiplication factor?

I guess that depends on the wavelength as diverse filters will behave differently!

Is the efficiency increased with the increase in eV of the light?

Asher
Yes, the Quantum efficiency of the system is wavelength dependent. in principle it looks like that:




The multiplication factor is variable and automatically adjusted internally, so not to blow the image, depending on availabe light and can reach 50.000x
 

Asher Kelman

OPF Owner/Editor-in-Chief
Yes, the Quantum efficiency of the system is wavelength dependent. in principle it looks like that:




The multiplication factor is variable and automatically adjusted internally, so not to blow the image, depending on availabe light and can reach 50.000x
X 50,000!

They should design the next Viagra drug...

....for women!

Asher
 
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