Camcorder Spectral Response
I used a 60W bulb with a thin filament as a source (about 2500 K ?) and a
transmission grating (Ed.Sci 52991) at the camera lens to make these
images. I also had a compact fluorescent bulb shining through a slot which
was lined up with the filament. The fluorescent light phosphors have fairly
narrow emission lines, which allowed me to calibrate the wavelength scale
viewing the fluorescent light with another spectroscope (Wabash Instrument
Co. model SP-125). Note: observing the solar Fraunhofer lines, I found it
reads wavelengths 4 nm too long, so the line appearing at 616 nm on the
wavelength scale is really at 611 nm.
It is interesting to see that the TRV900 renders wavelengths shorter than
about 403 nm (near-ultraviolet) as green, rather than blue. The TR7000
single chip Digital8 camera has an extended near-IR response to about 1000
nm (1 micron) when in "nightshot" mode (IR filter removed from optical
Back to technical measurements.