The exposure is generally good in low contrast situations, e.g., in daylight. This works well, in, e.g., the P and A modes. Just set the aperture you want on the lens aperture ring, set the ISO you want (or leave the ISO on auto), and the camera will set the appropriate shutter speed. You can use the camera's automatic exposure with this lens. Most system cameras handle this process automatically, however, since there is no signal connection between the lens and camera, the camera cannot help you with this process. When finding the focus range, you can then stop down the aperture to the desired size, and take the picture. To get the best focus accuracy, you should ideally focus manually using the largest aperture (f/3.5). All Micro Four Thirds camera have the magnified focus assist mode, but it may be more involved to enable it on some cameras. To disable the magnified mode, half press the shutter, or press the click wheel once more. It can then be magnified even more by scrolling the wheel. Pressing the wheel once enables the magnified view. When used on the Panasonic GH2, it is possible to use the rear click wheel to enable the focus assist mode. This lens can be used on any Micro Four Thirds camera, given that you enable the "SHOOT W/O LENS" option, as described above. Here is a discussion about the possible use of a fisheye lens. You can see this in the lower left example image, and even better in an article about the significance of odd and even aperture diaphragm blade numbers. The Samyang lens has six aperture diaphragm blades, and hence, there are six rays around strong flares when stopping down. Overall, I'd say the Samyang lens handles the flare better. The Lumix lens gets the green ghosting in the opposite corner of the sun. It has no markings between infinity and 0.25m, as seen here: Regarding the focus scale, I find it to be a bit lacking. There is a distance scale, but sadly no depth of field (DoF) scale. The focus ring is well dampened, and feels high quality. The Samyang lens has a traditional mechanical focus ring, which moves the whole lens assembly back and forth. This is due to the lens being made from metal materials, in contrast to the Lumix lens, which has a plastic exterior. I would say: Get the Olympus lens only if you would like a very compact lens at a low price.Įven though the Samyang lens is slightly smaller, and has smaller lens elements, it weights more. Finally, it does not perform nearly as well as the Samyang lens. And it does not have any aperture mechanism, so you cannot stop it down at all. Further, it is not nearly as fast, with a much smaller aperture of f/8. The Olympus 9mm f/8 fisheye is not as wide, covering only 140° diagonally.
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