These two examples with Olympus Zuiko 60mm f/2.8 ED using color saturation to shown the transition from a sharp zone to the unsharp zone.
These are approximations which might be of help in understanding where to expect peak sharpness from the Olympus 60mm f/2.8.
Use of ƒ/4 affords similar latitude to ƒ/5.6, but the transition to less sharp starts a little earlier.
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Since 2009, Diglloyd Guide to Mirrorless covers mirrorless cameras and lenses. Includes interchangeable lens camera systems (Sony, Fujifilm, Olympus, etc) as well as fixed-lens cameras (Sony, Sigma, Ricoh, etc).
In addition to the manufacturer-brand lenses, lens coverage includes 3rd-party lens lines like Zeiss Touit, Zeiss Loxia and Zeiss Batis.
It includes hundreds of pages of exclusive coverage and high resolution, Retina-grade examples for the new mirrorless camera systems from Sony, Fujifilm, Olympus, Sigma, Ricoh and more. Also included are operational concerns, like shutter vibration or other camera behaviors. This publication will play a decisive role in your selection and use of mirrorless cameras and lenses.