Is the KP's built-in flash really only half as powerful as the K-7's?
Photography Asked on June 14, 2021
2 Answers
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.
Answered by Bob Macaroni McStevens on June 14, 2021
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
Answered by Mike Sowsun on June 14, 2021
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