The Pentax AF160 FC is a very soft, uniform light source. It is also more powerful than most ringflash units on the market and the AF160FC has another unique feature not often seen on competing ringflash units, it has dual 120mm semi-circular flash tubes and the larger the light source: the softer the shadows get - which means the AF160 FC is also an excellent choice for portraiture.
Originally posted by stormtech Pentax ring flash using one side tube with more intensity than the opposite side which I would think would give some side light to show more detail. The ring light is supposed to have the ability to control either side of the ring light intensity - this part really intrigues me in thinking that I could control the angle of light somewhat.
that is also dependant on the lens you use, the wider the macro lens - the more pronounced the modelling effect will be, because you will be physically closer to your subject. I tend to use very long macro lenses Sigma 180mm APO EX Macro and the legendary Pentax FA*200mm f/4 ED Macro so I don't see much difference between using one half of the flash head or all of it. However with a short macro like the FA50mm f/2.5 Macro or the DA35mm f/2.8 Macro the effect of using only one half of the flash head would be more dramatic.
Originally posted by stormtech I would be using my D FA 100 Marco WR for this
An excellent choice, in the box that the AF160FC comes supplied in there is an adapter designed for use on the the FA100mm f/2.8 and D-FA 100mm f/2.8 WR lenses, it fits on the bayonet mount where lens hood goes and it keeps the weight of the flash head itself off the lens tube.
Pentax K-7 with Sigma 180mm f/3.5 APO EX Macro With Pentax AF160FC Pentax K7 with Sigma 180mm f/3.5 APO EX Macro- AF540 on the foreground AF360 as a rim-light and the AF160 FC used as fill flash.
Eastern Rosella - Pentax K10D Sigma 180mm f/3.5 APO EX Macro with Pentax AF160FC