4X5:

Schneider Super-Angulon XL 72 f/5.6 f/45 226

Excess Coverage=72.3
Excess%=31.99



8X10:

Nikon Nikkor SW 150 f/8 f/64 400

Excess Coverage=87.5
Excess%=21.88


A 72mm lens on 4X5 sheet film with less IC than the 150mm lens on 8X10 film gives 50% more excess coverage%...


What puzzles me is that users of the Nikkor 150SW have felt no need for a center filter (color or b/w) since it has plenty of coverage and provides excellent movements.

Why is this the case when the majority of 75mm F4.5-F5.6 lenses that have a similar or greater percentage of coverage than the Nikkor 150SW on 810 sheet film need a center filter? Rather, that most would say anything below a 90 on 45 sheet will need a CF especially shooting color film.