For those that may have seen my contributions on this subject on the 'other' site the following is a carry on with a Mark III sensor unit put up for test on Saturday 3rd Mark 2012.
The most significant difference (compared with the Mark II unit) is that this has a 70 mm tall shadow maker (compared with the Mark II which was 40 mm) and this is brass sheet painted black. The weather proof box ix slightly bigger.
Despite a lack of sunshine the initial results look promising, but more observation time is needed.
Self explanatory photographs below.
David in HK