A Fisheye on Infrared
You can see the corrected version of this article here. But I’ve left it so you can see the images.
As part of my testing of the Sigma 4.5mm F2.8 EX DC CIRCULAR FISHEYE HSM lens I went out with my Canon 350D that has been converted for infrared shooting. I was curious to see how the lens would perform in IR.
The Sigma is designed to produce a circular image on an APS-C sized digital camera. The field of view is 180 degrees. A lens like this is not going to be everyoneâ€™s cup of tea, for sure. I donâ€™t think I would spend the money myself to own one, but then I have only just started exploring this lens.
The shots below were taken with a variety of apertures and I found that the sharpest IR images were produced at f11 with this lens on my camera. The results are most unusual looking. Of course your real image size is much smaller than you may be used to since only the center of the image is used.
The resulting images are most interesting and I will do more work with this lens/camera combination before I return the lens, aside from my general testing of course.
Here I have added a black circular mask to cover the internal reflections.
Center of the image at f11
Center of the image at f2.8
If you are in the US you can buy the Sigma at B&H Photo.
Lens specifications can be found in the lens announcement on DIMi.