I just acquired the 120mm SW from a forum member here and did an illumination test this morning on a evenly lit wall using my 4x10. Using a Soligar spot meter the reading through the ground glass at center the reading was 11 and at the corners the reading was 7.7 or so, a little more then 3 stops of falloff.
B&H shows a Heliopan 77mm 3X center filter as an accessory and the cost is something like $473. I like the angle of view and I most likely will have to break down and get a center filter.
One thing for sure, it's easy to spend a ridiculous amount of money on photography.
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