Weird. I'm looking at guide number now ... and the guide number for the K50,
according to this article is 12.
Although why, then, have to use such a slow shutter speed at maybe 2 meters at ISO 400?
Basically, what I'm thinking is I need to find a significantly more powerful P-TTL flash than the built-in. I look at the relatively inexpensive Pentax AF-200FG ... it says it has a guide number of 20 at ISO 100/m. So 1.67 times more powerful.... wondering if that will be enough the way I shoot.
The Metz mecablitz 36 AF-5 says it has a GN of 36 and has a rotating head, which means I could use it with the lightsphere. Hmmmm.... that's 3 times the power of the builtin.
Guess I need to play around more and do a bit more research, but I'm probably in the market for one of these now.
Oh, look! More replies to go read. Thanks, everyone!
---------- Post added 01-12-2016 at 01:37 PM ----------
Woah. PENTAX AF360FGZ AF .... GN 119. Pretty sexy for $150.
---------- Post added 01-12-2016 at 01:41 PM ----------
Would plain TTL work as well? The difference, I understand, is TTL doesn't need to pre-flash ... but will the camera support that would be the question. Would they work together better with P-TTL. Or maybe it wouldn't work at all with just TTL, no clue.