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.