Is a quartz lens necessary to prevent UV blocking on full spectrum enabled cameras?

by ylluminate   Last Updated May 18, 2015 21:07 PM

I have read that in order to operate a "full spectrum" camera properly, so as to not block light in the ultraviolet portion of the spectrum, that one needs to acquire quartz lenses for one's camera. Is this indeed the case?

I have also seen that perhaps other lower cost options (such as perhaps plexiglass) may be an option, but I can't find anything solid with regards to the supporting data behind this.

I am considering acquiring a camera that has been modified to go down to 250nm, but I am not sure how to be certain that the camera's lenses themselves will not defeat the pre-moded effort. So depending on the answer to the first question, it begs the followup: If glass does destroy UV input, then how can one test or understand where the cutoff is for a glass lens?

Tags : lens optics uv

Answers 1

I am not sure what the spectral transmission of glass is at 250nm but you can test the transmission by using a spectroradiometer. You can point the radiometer at a test light source and measure its spectral power distribution. Then place the test lens between the source and the radiometer and measure it again. Divide the two measurements to get the transmission of the lens at each wavelength. Be sure your test source has sufficient power at the wavelengths you are interested in.

May 18, 2015 18:08 PM

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