1/8/2024 0 Comments Diy fisheye lensYou can compare angle of views on my best lenses for underwater page. In general, a fisheye will be much wider than a rectilinear lens. For example, the Tokina 10-17mm at 17mm is about as wide as the Nikon 12-24mm lens at 12mm. It is important to note the 17mm on a fisheye lens is not equivalent to 17mm on a rectilinear lens. Their width is usually expressed as an angle of view underwater. Inon and Ikelite make several "wet" wide angle lenses for compact cameras, like the Inon UWL-100 and the UWL-105AD. Lines in photos taken by rectilinear lenses remain straight. Wide angle examples are Nikon 12-24mm, Canon 10-22mm, Tokina 12-24mm, Sigma 10-22mm and Olympus 9-18mm. You'll have a choice to keep the automated distortion correction or manually adjust it by using the slider bars.Ĭlose-focus wide angle of large macro subjects such as large frogfish, rhinopias, large seahorsesĪ rectilinear lens is any lens besides a fisheye. Lightroom should automatically read the specs of your lens but if not, choose it from the dropdown menu. In the Lens Corrections section, choose "Enable Profile Corrections". The easiest way to correct the distortion post process is with Lightroom. However, underwater this is rarely done, as the slight curvature of a fisheye lens is often considered a desired effect. Land photographers will sometimes use software to correct the distortion of a fisheye lens. That is why they are called "fisheye", and the barrel distortion should not be viewed negatively. However, on fisheye lenses, this is their main feature. This is a negative aspect of cheaper rectilinear wide angle lenses at their widest settings. This distortion causes curved lines at the edges of the photo. When reading about fisheye and regular wide angle lenses, you will hear a term called barrel distortion. This can be clearly seen in the example photos at the beginning of this article. Tokina 10-17mm fisheye and Sigma 10-20mm wide angle lensĪlthough people often think of a fisheye lens as wider than a rectilinear lens, it's important to note that at the same focal length, a subject at the center of a fisheye lens will be magnified the same amount as a rectilinear lens. You usually need at least 2 strobes with good angle of coverage to properly light the entire area.They perform well behind dome ports with good corner sharpness, and they don't need a diopter.You can get very close to large subjects, maximizing color and sharpness.When shooting ultra-wide angle, you benefit from a large depth of field.Straight lines in the outer areas of the images will appear curved. The Sigma 8mm, 10mm, Sigma 15mm, Tokina 10-17mm, Nikon 8-15mm, 10.5mm, Nikon 16mm, Olympus 8mm, Inon UFL-165 and the Canon 8-15mm and 15mm are all fisheye lenses with an extra wide view up to a 180 diagonal degrees. Using a very wide lens allows to get very close to your subjects, giving your photograph more sharpness, and better colors when lit with a strobe.īehind a dome port, fisheye lenses perform better optically than regular wide-angle lenses. It is small and ultra-wide, and shows a distorted, spherical view of the world, most evident in the curved outer corners of the photo, known as the "fisheye effect".įisheye lenses happen to work very well underwater for a couple different reasons: This is common for astrophotography and infrared photography.A fisheye lens is a special type of ultra-wide angle lens. ![]() You could have your camera modified with a filter in front of the sensor. ![]() Image quality would probably be reduced, but this is probably the best option available to you. A gel filter may be thin enough to not interfere with camera operation. If you are using the lens on its native mount, without an adapter, trying to attach a glass filter behind the lens would interfere with the DSLR mirror. It may also be possible to fit a filter to an adapter not designed to hold one. Some mount adapters are designed to hold filters. It would be easiest to use a filter behind the lens. (eg, DIY Apodization Filter) Flare and reduced sharpness are likely problems, depending on lighting. Some people have disassembled lenses to fit internal filters. Your lens does not appear to be among them. Some lenses are designed to use internal filters. ![]() You may have to correct vignetting produced by the filter or crop the edges of your images. The filters may be expensive, and you would need to find or make a custom holder for your lens. To use a filter in front of the lens, you'd need a very large filter or a bowl-shaped filter that curves around the lens. The bulging front element of your lens makes using filters difficult.
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