Ricoh GXR Брошюра и технические характеристики - Страница 6
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Paired with a 23.6 mm×15.7 mm image sensor,
this GR LENS is a standard macro boasting superb definition and refined bokeh.
New system enables higher dimension of optical performance
The lens configuration has 8 groups and 9 elements. Making good use of the new
system's advantage of not having to accommodate back focal length, we were able
to design the refractive capabilities of each element in a more efficient and practi-
cal manner than is possible for SLR interchangeable lenses. Partly thanks to the
use of a large-diameter aspherical element, this lens achieves a superior level of
edge-to-edge resolution and image quality unimaginable for its small size.
In addition, there is little vignetting so richly luminous, natural-form bokeh
extends to the edge. The floating structure corrects various types of aberrations
that tend to occur in close-up photography. Even at the minimum shooting
distance, this lens gives excellent definition and sharpness worthy of the GR LENS
name.
*There is a built-in extendable hood.
Lens Unit
Beautiful bokeh and imaging power.23.6 mm × 15.7 mm CMOS sensor
The CMOS sensor boasts 23.6 mm × 15.7 mm size for rich bokeh and approxi-
mately 12.30 million effective pixels for superior resolution. Supporting the excep-
tional optical performance of the GR LENS, this image sensor enables the photog-
rapher to obtain both crisp details and refined bokeh, and the wide dynamic range
gives rich tonal gradations. The result is high image quality that demands printing
in large format.
Maximum 1/2x magnification and a focus ring for full-fledged
close-up photography
Close-up photography at a maximum magnification of 1/2x is possible, with the
minimum shooting distance approximately 7 cm from the front of the lens. A
manual focus ring is also provided. If the body focus ring setting selected is
AF+MF, after the AF focusing is done it is possible to turn the focus ring to make
fine adjustments to the focus.
Beautifully shoot and relive the excitement. High definition (HD)
movie function
Enjoy shooting HD movies. Image size is 1280×720, aspect ratio 16:9, and frame
rate 24 frames/sec. Utilizing the high sensitivity (maximum ISO 3200) and the
beautiful bokeh made possible by the F2.5 aperture and the large image sensor, it
is possible to create impressive movies with a different feel than those of standard
video cameras. The GXR body has an HDMI connector so for large-screen movie
viewing it can be connected to TVs supporting HDMI.
GR LENS A12 50mm F2.5 MACRO – Other Major Specifications
Item
Specifications
Effective pixels
Approximately 12.30 million
Image sensor
23.6×15.7mm CMOS (total pixels: 12.90 million)
Lens
Focal length
33 mm (35 mm format equivalent: 50mm)
Aperture(f-number)
f/2.5 – f/22(ND filter used for apertures of f/22 in auto shooting mode)
Focus range
Normal shooting: Approx. 30 cm – infinity, Macro shooting: Approx. 7 cm – infinity (maximum magnification 1/2x)
Construction
9 elements in 8 groups
Zoom
4.0× digital zoom (3.6x for movies), 5.9× auto resize zoom (VGA)
ISO sensitivity (Standard Output Sensitivity)
AUTO, AUTO-HI, ISO200 / ISO400 / ISO800 / ISO1600 / ISO3200
Flash Range (built-in flash)
Approx. 20 cm – 3.0 m (ISO auto)
Shutter speed
Photographs: 1/3200 – 180 sec. Movies: 1/30 – 1/2000 sec.
Number of pictureｓ shot in Continuous
Noise Reduction off or on (Weak): 4 pictures,
(Picture Size: RAW)
Noise Reduction on (Strong): 3 pictures
Continuous shooting
Photographs: 4288 × 2416, 3776 × 2832, 4288 × 2848, 2848 × 2848, 3456 × 1944,
capacity
3072 × 2304, 3456 × 2304, 2304 × 2304, 2592 × 1944, 2048 × 1536, 1280 × 960, 640 × 480
Movies: 1280 × 720, 640 × 480, 320 × 240
Battery life
Based on CIPA standard, DB-90: approx. 320 shots
Dimensions
Camera unit only:68.7 mm × 57.9 mm × 38.6 mm (excluding projections)
(W × H × D)
When mounted on the camera body:113.9 mm × 70.2 mm × 44.4 mm (excluding projections)
Weight
Camera unit only: Approx. 263g Mounted on camera body: Approx. 423g (not including battery,
SD memory card, or neck strap), accessory weight: approx. 23g (battery, strap)
5
MTF curve graph
(1/30x F2.5)
100
80
60
40
20
0
0.0
4.3
7.1 8.5 9.9 11.4 12.8 14.2
Distance from frame center(mm)
Blue lines:15/mm
Solid lines:Radial values
Red lines:45/mm
Dotted lines:Tangential values
*HDMI cable sold separately.
GR LENS A12 50mm F2.5 MACRO, 1/125sec, f/2.5, ISO200, WB: MANUAL, no