Well, I don't seem to have much of problem. Looking at all pics I did get of them, most of them are of upperside, except a mating one and one of underside.
I have used flash and they don't flinch for me. I just wait until they settle, approach very carefully and shoot without causing a shadow or moving vegetation they are on. I have numerous videos of them (up close). If they are in long grass, you have a bit of a problem. Otherwise, not much problems for me.
My dad has a vivitar 4345 and seems to get good (not best as its not designed for this) upperside shots.
And Gruditch, nice shot btw.
Here is one I took with flash:
Samsung Digimax L85
Mode: Manual
F-Stop: f/3.4
Exposure: 1/1000 Sec
ISO: ISO-400
Exposure: 0 Step
Focal length: 19mm
Max Apeture: 2.971
Metering Mode: Multi Spot
Flash: No Flash
Handheld
I found it a bit tricky getting mating pair, mainloy cause male flew off while they were in coup, cause they did not like me getting close.
One of the upperside (not hard in my opinion, don't cast a shadow or block sunlight, and just find them when they open wings) I have too many uppersides and not enough undersides. (5 uppersides and 1 underside pic so far
Samsung Digimax L85
Mode: Manual
F-Stop: f/3.6
Exposure: 1/500 Sec
ISO: ISO-400
Exposure: 0 Step
Focal length: 23mm
Max Apeture: 2.971
Metering Mode: Multi Spot
Flash: No Flash
Handheld
Well, its not hard if you have the patience. Ones in Europe are better looking, but our local ones are not too bad either.