Distance and Aperture when Using the Built-in Flash, 149 | Pentax L

Distance and Aperture when Using the Built-in Flash

A set criteria is necessary between the guide number, aperture and distance when shooting with the flash.

Calculate and adjust the shooting conditions if flash is not sufficient.

Flash guide number for built-in flash

Sensitivity	Built-in flash guide number

ISO200	15.6

ISO400	22

ISO800	31

ISO1600	44

ISO3200	62

Calculating Shooting Distance from Aperture Value

The following equation calculates the distance of the flash for aperture values.

Maximum flash distance L1 = Guide Number ÷ Selected aperture Minimum flash distance L2 = Maximum flash distance ÷ 5*

*The value 5 used in the formula above is a fixed value which applies only when using the built-in flash alone.

Example

When sensitivity is [ISO200] and aperture value is F4 L1 = 15.6 ÷ 4 = approx. 3.9 (m)

L2 = 3.9 ÷ 5 = approx. 0.8 (m)

Therefore, the flash can be used in a range of about 0.8 m to 3.9 m. The flash cannot be used when the distance is less than 0.7 m. When the flash is used at closer than 0.7 m, it causes vignetting in the picture corners, light is distributed unevenly and the picture may be over- exposed.

149

5 FunctionReference

Image 151

Pentax L Distance and Aperture when Using the Built-in Flash, 149, Calculating Shooting Distance from Aperture Value

Contents

Operating Manual Lenses you can use For Safe USE of Your Camera Care to be Taken During Handling Precautions for Battery UsagePage Before Using Your Camera ContentsGetting Started Other Shooting Modes Basic Operations Function Reference Menu Reference 162 160171 Appendix Composition of the Operating Manual Memo Before Using Your Camera Lccd LCamera Characteristics Checking the Contents of the Package Camera Names of Working Parts Kbutton LCD Monitor Indications While Power is On or Operating Mode Dial Explanation of Set Mode Dial Capture ModeDetailed Information Playback Histogram Display Viewfinder Indications Before Using Your Camera 610 LCD Panel Indications Getting Started Attaching the Strap Inserting the Batteries Batteries Battery Level Indicator Using the AC Adapter Optional Card cover opens Inserting/Removing the SD Memory CardPush the SD Memory Card in once to remove Precautions When Using the SD Memory Card RAW Recorded Pixels and Quality Level Turning the Camera On and Off Move the main switch to on position Press the four-way controller Initial SettingsSetting the Display Language Default setting is English GettingStarted Press the 4button Screen for setting the date and time will be displayed Setting the Date and Time Frame moves to the month Use the four-way controller 23 to set the month Attaching the Lens GettingStarted Adjusting the Viewfinder Diopter Memo Basic Operations Holding the Camera Basic Shooting Operation Autofocus mode is set. p.118 Letting the Camera Choose the Optimal SettingsSet the mode dial to 1Selecting the Appropriate Capturing Mode for Scenes p.47 Shutter release button halfway Turn the zoom ring to determine the size of the subjectPosition the subject inside the autofocus frame and press Press the shutter release button fully Shutter release button has two positions Review captured images on LCD monitor Hard-to-Autofocus Subjects Selecting the Appropriate Capturing Mode for Scenes Turn the zoom ring to the right or left Using the Zoom Lens Using the Built-in Flash Using the Built-in Flash Camera is ready to take a picture Selecting Flash Mode Press the buttonFn menu appears Flash options screen appears Flash discharges and the picture is taken Push the flash down to retract Daylight-Sync Shooting Using Red-eye Reduction FlashTaking pictures Auto Picture Continuous Shooting Other Shooting Modes Use the four-way controller 45 to select j Drive Mode options screen appearsCamera is ready to take pictures This camera has two types of self-timers g and r Self-Timer ShootingMount the camera to a tripod Fn menu appears Use the four-way controller 45 to select g or r Focus indicator appears when the subject is in focus Turn the camera off after shooting Mount the camera to a tripod Press the button Remote Control Shooting Remote Control F Sold Separately Use the four-way controller 45 to select h or Operating distance of the remote Using Mirror Lock Up Function to Prevent Camera Shake You can play back captured still pictures with the camera Playing Back Still PicturesPlaying Back Images Press the Q button after taking a picture Previous image appears Next image appears Rotating Images Four-way controller To select an image You can magnify images up to 12 times when displayingEnlarging Playback Images Press the Q button and use Turn the e-dial to the right Toward y Nine-Image Display Full screen display of the selected image appears Press the Q buttonTurn the e-dial to the left toward f ? appears for an image that cannot be displayed Slideshow Start screen is displayed Connecting the Camera to AV Equipment Processing Images with Filters Press the button Playback modeDigital Filter Save confirmation screen appears Use the four-way controller 45 to select an imageUse the four-way controller 2 to select Save as Screen for selecting the filter appears Deleting a Single Image Deleting ImagesUse the four-way controller 2 to select Delete Delete All screen appears Deleting All ImagesPress the Q button Press the i button twice You can delete all saved images at once Nine thumbnail images appear Deleting Selected Images From Nine-Image Display Selected images are deleted Use the four-way controller 2 to select Select&DeleteAppears above the images Delete confirmation screen appears Press the Z button Protecting Images from Deletion ProtectUse the four-way controller 2 to select Protect All images saved in the SD Memory Card are protected Protect all images screen appears Printing Single Images Setting the Printing Service DpofSet the following items for each image Date will be imprinted Date will not be imprinted Screen for making Dpof settings for all images appears Settings for All ImagesDpof screen appears BasicOperations Printing Using PictBridge Use the four-way controller To select the HSet-up menu Setting Transfer ModesA Rec. Mode menu appears Press the 3button Setting is changed Connecting the Camera to the PrinterUse the four-way controller 23 to select PictBridge Print one screen appears After printer start-up is complete, turn the camera onUse the four-way controller 45 to choose an image to print PictBridge menu appears Date will be printed Date will not be printed Screen for changing print settings appearsSelect Paper Size and press the four-way controller You can print up to 99 copies Print all images screen appears Printing All Images Print settings confirmation screen appears Press the 4button on the print settings confirmation screen Autoprint on the PictBridge menu Press the 4button Printing Images Using the Dpof SettingsDisconnecting the Cable from the Printer Use the four-way controller 23 to select Dpof Menu Reference Shutter release button Using the Button FunctionsCapture Mode Main switch 3button Focus mode leverMode dial Kbutton Move to turn the camera on and off. p.32 Press to switch to capture modePlayback Functions of buttons used during playback are noted Press to show shooting information on the LCD monitor. p.18 4button A Rec. Mode menu appears on the LCD monitor Using the MenuHow to Operate the Menu Press the 3button Capture mode Select a menu item and set Playback Menu Setting Items Rec. Mode Menu Setting Items CCD HSet-up Menu Setting Items 100 ACustom Menu Setting Items 101 Press the four-way controller 2345 to set the operation Using the Fn Menu Press the button during playback. The Fn menu appears 103Press the four-way controller 245 to set the operation Using the Mode Dial 105 106 Function Reference Setting the Image Tone Setting the Recorded Pixels and Quality LevelSet in Image Tone in the a Rec. Mode menu. p.98 Set in Recorded Pixels in the a Rec. Mode menu. p.98 Setting the Recorded Pixels109 Set in Quality Level in the a Rec. Mode menu. p.98 Setting the Quality Level110 Towards + Sharper Towards Less sharp Setting the Saturation/Sharpness/Contrast111 Towards + Higher saturation Towards Lower saturation 112 Setting the White BalanceSet White Balance in the Fn menu. p.102 White Balance screen appears Adjusting the White Balance ManuallySet the mode dial to e, b, c, or a Press the button 113 Use the four-way controller To select K Manual 114Message screen appears Set in ISO Corction in Auto in the ACustom menu. p.100 Setting the SensitivitySetting the Range of Automatic Correction in Auto 115 ISO Sensitivity Warning Display 116Set in ISO Snstvty Wrn Dspl in the ACustom menu. p.100 117 Setting the Color SpaceSet in Color Space in the ACustom menu. p.101 Using the Autofocus FocusingYou can focus with the following methods 119 Use the 4Button to Focus on the Subject 120 Set in Focusing Area in the a Rec. Mode menu p.98 Setting the Focusing Area121 Set AF Mode in the a Rec. Mode menu p.98 Setting the AF Mode122 123 Fixing the Focus Focus LockLock the focus 124 Fixing Exposure when Focus is Locked 125 Adjusting the Focus Manually Manual FocusUsing the Focus Indicator You can manually adjust the focus using the focus indicator Set the focus mode lever to \ Using the Viewfinder Matte Field126 Effect of Shutter Speed Setting the ExposureEffect of Aperture and Shutter Speed 127 Closing the aperture increase the aperture value 128Effect of Aperture Opening the aperture reduce the aperture value 129 How to Check Depth of Field 130 Using the Multi-Segment MeteringSet in AE Metering in the a Rec. Mode menu. p.98 Selecting the Metering Method Using the Spot Metering Using the Center-Weighted Metering131 132 Changing the Exposure Mode 133 Using the e Program Mode 134 Using the b Shutter Priority ModeSet the mode dial to b Turn the e-dial and adjust the shutter speed Exposure Warning 135 136 Using the cAperture Priority ModeSet the mode dial to c Turn the e-dial and adjust the aperture value 137 Set the mode dial to a Using a Manual Mode138 Shutter speed and aperture value 139 Set the mode dial to p Using the p Bulb Mode140 Is displayed during compensation Setting the Exposure141 Set the compensation with Recording the Exposure Before Shooting AE Lock Changing the Exposure Setting StepsExposure setting cannot be obtained 142 Use the four-way controller 5 to select VAuto Bracket Press the button in capture modeChanging the Exposure and Shooting Auto Bracket 143 144 Focus indicator appears in the viewfinder when focusedShooting is ready and is displayed on the LCD panel Change the shooting order and steps of Auto Bracket Setting Auto BracketSet in Auto Bracket in the a Rec. Mode menu. p.98 145 Compensating Flash Output Set in Flash Exp. Comp. in the a Rec. Mode menu. p.98 Allowing Shooting while Charging Flash Flash Characteristics in Each Exposure ModeUsing the Flash in b Shutter Priority Mode Using the Flash in Av Aperture Priority Mode 148 Using Slow-Speed-SyncUsing b Shutter Priority Mode Using a Manual Mode 149 Distance and Aperture when Using the Built-in FlashCalculating Shooting Distance from Aperture Value Calculating Aperture Value from Shooting Distance 150 Lens Name Compatibility 151 152 153 Using an External Flash Optional 154 Using P-TTL Auto ModeAbout the LCD Panel Display for AF360FGZ Using in Wireless Mode Using High-Speed Flash Sync Mode155 156 Using in Wireless ModeExternal flash discharges the main flash Rear Curtain Sync Flash Using the Built-in Flash with the External Flash157 Red-Eye Reduction 158 When combining two or more external flashesDischarging Multiple Flashes Contrast-Control-Sync Flash 159 Set in Plybk dsply mthd in the Q Playback menu. p.98 Settings During PlaybackChanging Playback Display Method Displaying Bright Portion Warning 161 Setting the Slideshow Display IntervalSet in Bright Portion in the Q Playback menu. p.98 Formatting the SD Memory Card Camera SettingsUse the four-way controller 2 to select Format Changing the Date and Time and the Display Style Turning the Beep On and Off163 Use the four-way controller 45 to select O On or P Off Setting the World Time164 Select World Time on the HSet-up menu. p.99 Press the 3button twice World Time setting is saved165 Use the four-way controller To select the Destination city List of World Time Cities 166 167 Turning the Guide Display On and OffSet in Guide display in the HSet-up menu. p.99 Selecting the Video Output Format Adjusting the Brightness of the LCD Monitor168 Set in File # in the HSet-up menu. p.99 Setting Auto Power OffResetting the File Number 169 Displaying Histogram During Instant Review Setting the Instant ReviewSetting the Display Time 170 171 Resetting to Default SettingsResetting Rec. Mode/Playback/Set-up Menu To select Reset Use the four-way controller 2 to select Reset Resetting the Custom Function Menu172 181 174178 180 Rec. Mode Menu Default SettingsLast Memory Setting Reset Setting Set-up Menu 175 ACustom Menu 176 Fn Menu 177 Lenses that can be used with this camera Functions Available with Various Lens Combinations Lens names and mount names 179Lens and Built-in Flash Aperture Ring Use Sensor Cleaning screen appears Cleaning the CCD181 Mirror is locked in the up position Clean the CCD182 Press the four-way controller 2 to select Mirror Up 183 Optional Accessories For Viewfinder 184 Camera Case O-CC34 185Camera Case Others Batteries in the camera. p.25 Error Messages Print 187 Troubleshooting USB 189 RAW Main Specifications 191 192 Specifications for Remote Control F Optional 193 Glossary 194 Noise Reduction 195Histogram ND Neutral Density Filter 196 197 Index 199 200 201 All Pentax cameras purchased through authorized bona fide Nonauthorized Pentax service facilities 203 Pour les utilisateurs au Canada 204For customers in USA For customers in Canada Declaration of Conformity European Headquarters Germany Pentax U.K. Limited