A Fisheye on Infrared(Fixed)
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.
But in the previous attempt at this article I got caught by my enthusiasm to get out and shoot with this lens as quickly as possible, and screwed up. Thanks to Alexandr Milewski for spotting it. The screw up was that the 4.5mm lens comes with two lenscaps, a normal one and then a lenshood-like cap that clears the protruding front element. I neglected to remove this. You can see the effect below and then the correct version below that.
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.
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.