sun_in_uva_visible1jsm
Today's sun in UV-A and visible wavelengths.
Playing around here. I was hoping to see a difference in a UV-A image and a visible image, but found nothing significant enough to stray me away from shooting just visible light of the sun.
Used the same solar filter on a 500mm lens with a 1.4x converter for each camera body. For UV, I used a Life-pixel'd UV converted Nikon D700 with a ZWB1 filter within the 500mm lens (replaced the internal 'UV filter' that came with the lens). I used the ZWB1 filter to nip off the visible light bleedthrough tail of the converted camera filter's upper UV bandwidth, and I would guess the 500mm lens, et al., would not let too much UV through to the camera sensor so I'd expect only a sliver of UVlight around the wavelength of 370 to 380nm to be shown in the image. Even though the lenses are not optically designed for UV, I would also have expected for such a narrow bandwidth of UV making it through to the image, the image would have been sharper.
I'm no guru with Photoshop, but I did try to process the two images similarly...
sun_in_uva_visible1jsm
Today's sun in UV-A and visible wavelengths.
Playing around here. I was hoping to see a difference in a UV-A image and a visible image, but found nothing significant enough to stray me away from shooting just visible light of the sun.
Used the same solar filter on a 500mm lens with a 1.4x converter for each camera body. For UV, I used a Life-pixel'd UV converted Nikon D700 with a ZWB1 filter within the 500mm lens (replaced the internal 'UV filter' that came with the lens). I used the ZWB1 filter to nip off the visible light bleedthrough tail of the converted camera filter's upper UV bandwidth, and I would guess the 500mm lens, et al., would not let too much UV through to the camera sensor so I'd expect only a sliver of UVlight around the wavelength of 370 to 380nm to be shown in the image. Even though the lenses are not optically designed for UV, I would also have expected for such a narrow bandwidth of UV making it through to the image, the image would have been sharper.
I'm no guru with Photoshop, but I did try to process the two images similarly...