This GXR Mount A12 For Leica M Mount Lens from Ricoh is a "camera unit" for the GXR camera which accepts Leica M mount lenses. The GXR camera has an unusual design which incorporates a "body" combined with an interchangeable "camera unit". Each camera unit contains an image sensor and an image processing engine (most also include a lens). This camera unit has an APS-C size CMOS sensor and a focal plane shutter, but no lens. It will accept a Leica M mount lens and may be adapted to accept other lenses, as well. Various correction functions, such as color correcting at the corners, peripheral illumination, and distortion correction, are built-in.
APS-C Size CMOS Sensor
The adoption of a CMOS sensor with an optimized micro lens layout makes it possible to secure sufficient brightness levels even in the peripheral areas of the image.
The CMOS sensor used is 23.6mm × 15.7mm (APS-C size). It enables the shooting of high-quality images with smooth tone gradations as well as high definition and low noise.
Compatible With Leica M Mount
Compatible with the Leica M mount, GXR MOUNT A12 can, of course, handle M-mount lenses, and if a conversion adapter is used many more types of mounts can also be accommodated.
A checking device is included for use in confirming whether or not your lenses are physically compatible.
Functions Maximize the Potential of the Lens
In order to accommodate the photographer's own preferences by adjusting for the distinctive characteristics of many different lenses, GXR MOUNT A12 can independently correct coloring at the corners. Color shading correction is possible in a -4 to +4 range for both R and B.
Peripheral illumination correction is possible in a -3 to +3 range.
A distortion correction function is provided to correct for the distortion that tends to occur in the lens periphery. The photographer can select barrel and pincushion distortion and specify "strong," "medium," or "weak" for each.
A glass optical filter was adopted and made as thin as possible. It increases periphery image quality and suppresses field curvature.
A focus-assist function has been included in an effort to raise the accuracy of manual focusing. The photographer can select from two modes and check the focus by strengthening outlines and contrast.
Magnifying the screen image while shooting is an effective technique for focusing. The magnification can be done not only in the center but throughout the image. In addition, the image quality for 4x and 8x magnification has been further enhanced. The area to be magnified can be moved using the directional pad.
Two Shutter Methods
With the focal plane shutter, settings of 1/4000 sec. to 180 sec. are possible.
With the electronic shutter, settings of 1/8000 sec. to 1 sec. are possible, and the photographer can shoot without worrying about shutter noise and vibration.
APS-C size CMOS sensor
Corner correction of -4 to +4 in R and in B
Peripheral illumination correction: -3 to +3
Focal plane shutter: 180 sec to 1/4000 sec
Electronic shutter: 1 sec to 1/8000