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Olympus M. Zuiko 17mm f/1.8

Avoid Stepped Manual Focusing (Olympus E-M5, Dolls)

The Olympus 17mm f/1.8 offers a manual focus mode when the focusing ring is pulled back, exposing the distance scale as shown below, but there is a fundamental defect in using the “pull back” mode: the focus changes to a coarse “stepped mode”, with steps too huge to be useful.

The 17/1.8 can also be focused manually without pulling the ring back in a stepless (continuous) mode. That is the better approach as will be shown.

Example

The test scene here is from the doll’s comparison, using the Olympus OM-D E-M5.

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Diglloyd Guide to Mirrorless offers comprehensive integrated coverage of most APS-C and full frame mirrorless cameras and lenses.

Special emphasis is placed on Sony full-frame, including Sony lenses and the high performance Zeiss Batis and Zeiss Loxia lenses plus Rokinon/Samyang and others. Fujifilm X, Olympus and Panasonic M4/3, Sigma dp Merrill and dp/sd Quattro are also covered in depth. Years in the making, it offers a wealth of material for choosing and using a mirrorless camera.

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  • Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.

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Variants Continuous (best), Stepped (next best), Stepped +1, Stepped -1 available in full article

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