Overview

GR A12 50mm f2.5 MACRO Lens

This lens gives a natural visual field with an angle of view nearly the same as the human eye. The 50 mm focal length is one of the most basic for candid photography. Compared to a wide-angle lens, a suitable distance is maintained from the subject, and the photographer is able to chat with the subject and elicit natural expressions to capture the person in a candid way without undue attention being paid to the camera. GR LENS A12 50 mm is also a macro lens. The photographer can enjoy close-up photography to a maximum magnification of 1/2x and, from a wide open aperture setting, obtain images with excellent sharpness and high contrast and resolution to the edge.

The lens configuration is 8 groups and 9 elements. As a standard macro lens, there is nothing particularly unusual about this configuration, but 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 practical manner. 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.

Even with the focal length unchanged, the larger the image sensor, the richer the bokeh that can be obtained. A 23.6 mm × 15.7 mm CMOS sensor enables the lens to make full use of the lens' superior optical performance. With the low level of colour and frame aberrations even near the edge of the image, refined bokeh can be enjoyed with the aperture wide open, and stopping down gives comfortably crisp resolution. In addition, the wide dynamic range and resolving power of the approximately 12.30 million effective pixels enhance the reproducibility of details and delicate tonal nuances. The result is high image quality that is more than adequate for large-format prints.

Close-up photography at a maximum magnification of 1/2x is possible. Making good use of this magnification ratio, the photographer can enjoy greater freedom in creative close-up shots, moving back a bit to light the subject so it is not in the camera's shadow. The minimum shooting distance is approximately 7 cm from the front of the lens.

HD movie image size is 1280×720, aspect ratio 16:9, and frame rate 24 frames/second. Utilizing the high sensitivity (maximum ISO 3200) and the bokeh enabled 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, and for large-screen viewing of the movies shot, the GXR can be connected to TVs supporting HDMI.

Specifications

Effective pixels			Approximately 12.3 million
Image sensor			23.6 mm x 15.7 mm CMOS (total pixels: approx. 12.9 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 (from lens)		Normal shooting: Approx. 30 cm - infinity
			Macro shooting: Approx. 7 cm - infinity (maximum magnification 1/2x)
	Construction		9 elements in 8 groups (1 aspherical lens element with 2 surfaces)
	Filter size		40.5 mm
Zoom			4.0x digital zoom (3.6x for movies) 5.9x auto resize zoom (VGA)
Focus mode			Contrast AF-based multi and spot AF; MF; Snap; infinity (focus lock and AF-assist)
Shutter speed	Photographs		180 - 1/3200 s (upper and lower limits vary according to shooting and flash mode)
	Movies		1/30 - 1/2000 s
Exposure control	Metering		TTL-CCD metering in multi (256-segment), center-weighted, and spot modes with autoexposure lock
	Mode		Program AE, aperture priority AE, manual exposure, shutter priority AE, move target function
	Exposure Compensation		Manual (+4.0 to -4.0 EV in increments 1/3 EV or 1/2 EV), auto bracketing (-2 EV to +2 EV in increments 1/3 EV or 1/2 EV)
ISO sensitivity (Standard Output Sensitivity)			AUTO, AUTO-HI, ISO200/ISO400/ISO800/ISO1600/ISO3200
White balance			Auto / Multi-P AUTO / Outdoors / Cloudy / Incandescent Lamp / Fluorescent Lamp / Manual Settings / Detail; white balance Bracketing
Flash	Range (built-in flash)		Approx. 20 cm - 3.0 m (ISO auto)
Shooting mode			Auto / program shift / aperture priority / shutter priority / manual /scene (movie, portrait, sports, landscape, nightscape, skew correction) / "My Settings"
Continuous mode	Number of pictures shot in Continuous (Picture Size: RAW)		Noise Reduction off or on (Weak): 4 pictures Noise Reduction on (Strong): 3 pictures
	Number of pictures shot in M-Cont Plus (1 set)		HI (1280 x 854): 30 pictures (24 Frames/Sec) LO (4228 x 2848): 15 pictures (3 Frames/Sec)
Picture quality *1			FINE, NORMAL, RAW (DNG) *2
Image size (pixels)	Photographs	16:9	4288 x 2416, 3456 x 1944
		4:3	3776 x 2832, 3072 x 2304, 2592 x 1944, 2048 x 1536, 1280 x 960, 640 x 480
		3:2	4288 x 2848, 3456 x 2304
		1:1	2848 x 2848, 2304 x 2304
	Movies *3(24 Frames/Sec)		1280 x 720, 640 x 480, 320 x 240
File size (approx.)	RAW	16:9	NORMAL: 17,800 KB/frame, FINE: 19,515 KB/frame, VGA: 15,587 KB/frame
		4:3	NORMAL: 18,387 KB/frame, FINE: 20,157 KB/frame, VGA: 16,124 KB/frame
		3:2	NORMAL: 20,946 KB/frame, FINE: 22,967 KB/frame, VGA: 18,337 KB/frame
		1:1	NORMAL: 13,991 KB/frame, FINE: 15,333 KB/frame, VGA: 12,273 KB/frame
	L	16:9	NORMAL: 2,222 KB/frame, FINE: 3,816 KB/frame
		4:3	NORMAL: 2,315 KB/frame, FINE: 3,960 KB/frame
		3:2	NORMAL: 2,615 KB/frame, FINE: 4,493 KB/frame
		1:1	NORMAL: 1,761 KB/frame, FINE: 3,009 KB/frame
	M	16:9	NORMAL: 1,475 KB/frame, FINE: 2,509 KB/frame
		4:3	NORMAL: 1,574 KB/frame, FINE: 2,662 KB/frame
		3:2	NORMAL: 1,744 KB/frame, FINE: 2,968 KB/frame
		1:1	NORMAL: 1,186 KB/frame, FINE: 2,003 KB/frame
	5M	4:3	FINE: 2,287 KB/frame
	3M	4:3	FINE: 1,474 KB/frame
	1M	4:3	FINE: 812 KB/frame
	VGA	4:3	FINE: 197 KB/frame
Battery life			Based on CIPA standard, DB-90: approx. 320 shots *4
Dimensions (W x H x D)			Camera unit only: 68.7 mm x 57.9 mm x 71.3 mm (including the lens barrel; Excluding the connector) When mounted on the camera body: 113.9 mm x 70.2 mm x 77.1 mm (including the lens barrel)
Weight (approx.)			Camera unit only: 263 g (not including the lens cap or Connector cap) When mounted on the camera body: 423 g (not including the Battery, memory card, neck strap, connector cap, or lens cap)
Operating temperature			0 °C to 40 °C
Operating humidity			85% or less
Storage temperature			-20 °C to 60 °C

1 The picture quality modes which can be set vary depending on the image size.
2 A JPEG file is also recorded (the JPEG file may be a FINE- or NORMAL-quality file with the same dimensions as the RAW file or a VGA file 640 × 480 pixels in size). RAW files use the standard DNG format promoted by Adobe Systems Incorporated.
3 When shooting movies of 1280×720 size, the use of an SD/SDHC memory card with an SD speed class of Class 6 or higher is recommended.
4 For reference only; actual number of shots varies greatly according to how camera is used. We recommend that you carry spare batteries when in use for extended periods. (Shooting capacity was measured using CIPA-standard parameters. These are only estimates; performance may vary depending on usage conditions.)