Pentax K110D - Manual (Page 154)

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You can use slow-speed-sync when shooting portraits with the sunset in the
background. Both the portrait and the background are captured beautifully.
Using b (Shutter Priority) Mode
1 Set the mode dial to b.
b (Shutter Priority) mode is set.
2 Use the e-dial to set the desired shutter speed.
The background is not properly corrected if aperture value is blinking
when shutter speed is set. Set the shutter speed so that aperture value
does not blink.
3 Press the K button.
The flash pops up.
4 Take the picture.
Using a (Manual) Mode
1 Set the mode dial to a.
a (Manual) mode is set.
2 Set the shutter speed (under 1/180 sec.) and aperture value to obtain
correct exposure.
3 Press the K button.
The flash pops up.
In a (Manual) mode, you can raise the flash at any time prior to shooting.
4 Take the picture.
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.
Built-in flash guide number
Using Slow-Speed-Sync
• Slow-speed-sync slows the shutter speed. Use a tripod to avoid camera
shake. The picture will also blur if the subject moves.
• Slow-speed-sync shooting can also be performed with an external flash.
Distance and Aperture when Using the Built-in Flash
Sensitivity Built-in flash guide number
ISO 200 15.6
ISO 400 22
ISO 800 31
ISO 1600 44
ISO 3200 62