this is a great flash for macro photography and I am selling it.
update: my dad writes: “I recently bought a PentaxK20D which takes great pictures and uses all my old Pentax lenses, but my Pentax AF140 ring flash will not work TTL (Through The Lens) with the digital camera; it fires, but only at full power. A ring flash fits on the end of the lens for extreme close ups, so that the lens shadow does not get in the picture. I have found a way around this by using a neutral density filter (cuts down the light transmitted, but does not change the color) to cut down the light from the subject. A 3-stop neutral density filter is just right at the closest distance to the subject (ie. 1:1) with my Tamron macro lens at f32 and the camera sensitivity at ISO100. This is fine for very small insects, and for larger subjects such as moths I either increase the ISO or go to a larger aperture, such as f22, or f16. I was using ISO200 and f16 for a praying mantis a month ago.
This is from http://ken-ericksons.blogspot.com/2009_01_01_archive.html
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Mz5n with three following lenses:
1. Pentax FA 28-70/4 AL
2. Pentax FA 31/1.8 LTD
3. Pentax FA 50/1.4
, with front caps on. Actually, focus hunting speed test
this is a great flash for macro photography and I am selling it.
Mz5n with three following lenses:
Just for fun, auto focus speed of the DA* 50-135mm f/2.8 lens on my DS and 
AF speed – 
Just for fun, auto focus speed of the DA* 300mm f/4 lens on my DS and 
Just for fun, auto focus speed of the Sigma 18-50mm f/2.8 EX DC MACRO lens on my DS and
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