Pentax K-30 User Manual

238
Using the Flash
9
Relationships among the guide number, aperture and distance must be
considered when shooting with the flash to obtain a correct exposure.
Calculate the shooting distance or aperture value in the following way, and
adjust the shooting conditions if the flash output is not sufficient.
*1 This can be used when [3. Expanded Sensitivity] in the [ A Custom Setting 1] menu is set to [On].
The following equation calculates the effective distance of the flash.
Maximum flash distance L1 = Guide number ÷ Aperture value
Minimum flash distance L2 = Maximum flash distance ÷ 5 *
* The value used in the formula above is a fixed value which
applies only when using the built-in flash alone.
Example:
When the sensitivity is ISO 200 and the aperture value is F5.6:
L1 = 17 ÷ 5.6 = approx. 3 (m)
L2 = 3 ÷ 5 = approx. 0.6 (m)
Therefore, the flash can be used in a range of about 0.6 m to 3 m.
However, the built-in flash in this camera cannot be used when the
distance is 0.7 m or less. When the flash is used at distances closer
than 0.7 m, it causes vignetting in the picture corners, light is
distributed unevenly and the picture may be overexposed.
The following equation calculates the correct aperture value.
Aperture value F = Guide number ÷ Shooting distance
Example:
When the sensitivity is ISO 200 and the shooting distance is 4 m:
F = 17 ÷ 4 = approx. 4.2
If the resulting number (4.2, in the above example) is not available
as a lens aperture, a smaller number that is closest (4.0, in the
above example) is generally used.
Distance and Aperture when Using the Built-in Flash
ISO Sensitivity
Built-in Flash
Guide Number
ISO Sensitivity
Built-in Flash
Guide Number
ISO 100
Approx. 12
ISO 3200
Approx. 68
ISO 200
Approx. 17
ISO 6400
Approx. 96
ISO 400
Approx. 24
ISO 12800
Approx. 136
ISO 800
Approx. 34
ISO 25600
*1
Approx. 192
ISO 1600
Approx. 48
Calculating Shooting Distance from Aperture Value
Calculating Aperture Value from Shooting Distance
e_kb524_84percent.book Page 238 Friday, June 15, 2012 12:13 PM

Pentax K-30 Specifications

General

Megapixel	16.28 MP
Camera type	SLR Camera Body
Sensor type	CMOS
Sensor format	Advanced Photo System type-C (APS-C)
Image stabilizer	Yes
Total megapixels	16.49 MP
Image sensor size	- \
Image formats supported	JPG, RAW
Supported aspect ratios	3:2
Maximum image resolution	4928 x 3264 pixels
Image sensor size (W x H)	23.7 x 15.7 mm
Still image resolution(s)	16M (4928 x 3264 pixels), \\r 10M (3936 x 2624 pixels), \\r 6M (3072 x 2048 pixels), \\r 2M (1728 x 1152 pixels)
Optical zoom	- x
Mounting type	Bayonet
Focal length range	- mm
Lens mount interface	Pentax KAF2
Minimum aperture number	-
Focus	TTL
Focus adjustment	Auto/Manual
Auto Focus (AF) points	11
Auto focusing (AF) modes	Continuous Auto Focus, Selective Auto Focus, Single Auto Focus, Spot Auto Focus, Tracking Auto Focus
Auto Focus (AF) points selection	Auto, Manual
Light metering	Centre-weighted, Evaluative (Multi-pattern), Spot
ISO sensitivity	100, 12800, 25600
Light exposure modes	Aperture priority AE, Auto, Manual, Shutter priority AE
ISO sensitivity (max)	25600
ISO sensitivity (min)	100
Light exposure control	Program AE
Light exposure correction	± 5EV (1/3EV step)
Camera shutter type	Electronic
Fastest camera shutter speed	1/6000 s
Slowest camera shutter speed	30 s
Flash modes	Red-eye reduction, Second curtain synchro, Slow synchronization
Flash exposure correction	-2EV - +1EV (1/2 EV step)
Power source type	Battery
Video resolutions	640 x 480, 1280 x 720, 1920 x 1080 pixels
Motion JPEG frame rate	60 fps
Video formats supported	AVI, H.264, MPEG4
Maximum video resolution	1920 x 1080 pixels
Memory slots	1
Internal memory	- MB
Compatible memory cards	SD, SDHC, SDXC
Display diagonal	3 \
Display resolution (numeric)	921000 pixels
Magnification	0.92 x
Viewfinder type	Optical
USB version	2.0
Product color	Blue
Scene modes	Backlight, Beach, Candlelight, Children, Museum, Night, Night portrait, Pet, Portrait, Snow, Sports, Sunset, Landscape (scenery)
Image editing	Crop, Resizing, Rotating
Photo effects	Black&White, Muted, Negative film
White balance	Auto, Cloudy, Custom modes, Daylight, Fine, Flash, Fluorescent, Fluorescent L, Manual, Shade, Tungsten
Shooting modes	Aperture priority, Auto, Manual, Movie, Program, Scene, Shutter priority
Camera playback	Highlights, Single image, Slide show, Thumbnails
Self-timer delay	2, 12 s
Camera file system	DCF 2.0, Exif 2.3, RAW
Playback zoom (max)	16 x
Diopter adjustment (D-D)	-2.5 - 1.5
Mac operating systems supported	Mac OS X 10.4 Tiger, Mac OS X 10.5 Leopard, Mac OS X 10.6 Snow Leopard, Mac OS X 10.7 Lion, Mac OS X 10.8 Mountain Lion
On Screen Display (OSD) languages	CZE, DAN, DEU, DUT, ENG, ESP, FIN, FRE, GRE, HUN, ITA, POL, POR, RUS, SWE, TUR
Windows operating systems supported	Windows 7 Home Basic, Windows 7 Home Basic x64, Windows 7 Home Premium, Windows 7 Home Premium x64, Windows 7 Professional, Windows 7 Professional x64, Windows 7 Starter, Windows 7 Starter x64, Windows 7 Ultimate, Windows 7 Ultimate x64, Windows 8, Windows 8 Enterprise, Windows 8 Enterprise x64, Windows 8 Pro, Windows 8 Pro x64, Windows 8 x64, Windows Vista Business, Windows Vista Business x64, Windows Vista Enterprise, Windows Vista Enterprise x64, Windows Vista Home Basic, Windows Vista Home Basic x64, Windows Vista Home Premium, Windows Vista Home Premium x64, Windows Vista Ultimate, Windows Vista Ultimate x64, Windows XP Home, Windows XP Home x64, Windows XP Professional, Windows XP Professional x64
Battery type	D-LI 109
Battery life (CIPA standard)	480 shots
Cables included	AC, USB
Bundled software	PENTAX Digital Camera Utility 4

Weight and Dimensions

Depth	71.5 mm
Width	128.5 mm
Height	96.5 mm
Weight	590 g
Weight (including battery)	650 g