Is the KP's built-in flash really only half as powerful as the K-7's?

Question

Is the Pentax KP's built-in flash only half as powerful as that of the K-7?

Bob Macaroni McStevens · Answer

Per Pentaxforums.com the K7 has a guide number of 13 meters and the KP has a guide number of 6 meters.
The inverse square law applies.
The K7's flash provides appoximately 4.7 times more light output than the KP.

Mike Sowsun · Answer

Yes, the Pentax KP built-in flash Guide Number is only about half the Pentax K-7.
Page 128 of the Pentax KP user manual specifies the Guide Number at 6 meters.
Page 312 of the Pentax K-7 user manual specifies the guide number at 13 meters.
There is some speculation in online Pentax forums that the KP’s better ISO performance can make up for the weak onboard flash. Others say it is really to only be used as a wireless controller for off-camera flash.
In any case it is a big departure from all other Pentax DSLRs and also DSLRs of all manufacturers which generally have a Guide Number of about 13 meters.
Pentax KP user manual

Pentax K-7 user manual

Is the KP's built-in flash really only half as powerful as the K-7's?

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