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Ricoh GR Lens Performance
The Ricoh GR uses no optical low pass filter, and the lens is highly optimized for the sensor, with the result that per-pixel sharpness is outstanding.
Ricoh/Pentax claims about the lens are borne out by seeing truly outstanding results in the field. I have no reason to disagree with these claims, based on my usage.
As per the Ricoh marketing page, see also the Ricoh GR special site:
The newly developed GR lens achieves the GR series' best shooting performance in the world's smallest* camera body.
This model is equipped with the compact, high-performance, GR LENS 18.3mm F2.8(equivalent to 28mm in the 35mm format).
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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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Ricoh GR