Beyond Visible
Monochromatic Ultraviolet & Infrared Testing of the Fuji S3Pro and UV-Nikkor 105mm f4.5

Shane Elen

Simple Monochromatic Ultraviolet & Infrared Testing
A Fuji S3Pro fitted with a UV-Nikkor 105mm f4.5 lens (Baader Venus filter fitted for UV range and Hoya 695nm for the IR range) was used in a darkroom to record monochromatic ultraviolet and infrared light of 1nm band pass. This is extremely narrow band light of one specific wavelength e.g. 350nm +/-0.5nm. The image was defocused to try and diffuse the light a little and the image intensities are not an indication of CCD response. This is because the xenon source used does not have a uniform output but contains numerous spikes superimposed on a broadband emission. A series of ultraviolet images of the source were captured in steps of 5nm for light below 400nm and testing was stopped at 345nm as no image was obtained at 340nm. This end point might be beyond "normal lighting" situations but it is an indication of the range possible when a very strong ultraviolet source of this wavelength is used. Unfortunately I did not have access to the UVIR version of this camera but the distribution of UV or IR between the RGB channels is assumed to be similar.

The advantage of monochromatic light is that absolutely no infrared is present in the light source and therefore all images are pure ultraviolet. The purpose was to determine the ultraviolet range of this equipment combination but it also revealed characteristics with regards to how the Fuji S3Pro CCD deals with ultraviolet and infrared light. By observing the colour of the image and the histogram, an idea of how UV or IR is distributed into the RGB channels can be determined.

345nm
Fig. 345nm
350nm
Fig. 350nm
355nm
Fig. 355nm
360nm
Fig. 360nm
365nm
Fig. 365nm

345nm
Fig. h345nm
350nm
Fig. h350nm
355nm
Fig. h355nm
360nm
Fig. h360nm
365nm
Fig. h365nm

370nm
Fig. 370nm
375nm
Fig. 375nm
380nm
Fig. 380nm
385nm
Fig. 385nm
390nm
Fig. 390nm

370nm
Fig. 370nm
375nm
Fig. h375nm
380nm
Fig. h380nm
385nm
Fig. h385nm
390nm
Fig. h390nm

395nm
Fig. 395nm
400nm
Fig. 400nm

395nm
Fig. h395nm
400nm
Fig. h400nm

700nm
Fig. 700nm
725nm
Fig. 725nm
750nm
Fig. 750nm
775nm
Fig. 775nm
800nm
Fig. 800nm

700nm
Fig. h700nm
725nm
Fig. h725nm
750nm
Fig. h750nm
775nm
Fig. h775nm
800nm
Fig. h800nm

825nm
Fig. 825nm
850nm
Fig. 850nm
875nm
Fig. 875nm
900nm
Fig. 900nm
925nm
Fig. 925nm

825nm
Fig. h825nm
850nm
Fig. h850nm
875nm
Fig. h875nm
900nm
Fig. h900nm
925nm
Fig. h925nm

950nm
Fig. 950nm

950nm
Fig. h950nm

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© Shane Elen 2006. Last updated Apr 5th, 2007.