Dave I,d go for the 100 although youll probably get the whole disc on the 80. Personally after viewing all the WL shots I,d be inclined to go for 140mm as this seems to be the minimum aperture to really capture the granulation in great detail.I have an 80,102 and 127 and use the 80 most as it also gives a full disc with the CaK B1200 Wedge and Gstar chip.
Cheers Derek
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