I have two 4x5s: Old style Cambo Wide with 65mm lens; and 5x7 Deardorff with 4x5 reducing back and use 75 mm Nikon (both are wonderful-see attached example from Cambo Wide+400NC film). (1) Is it worth purchasing a Fresnel lens (screen) for use with these wide angle lenses? (2) Any suggestions on the widest lens one can use on 4x5 with a Fresnel screen? I'm aware that there can be "blackout" problems typically associated with these brightening screens when used with wide angle lenses. (3) What is difference between Ebony 4x5 frensel and Ebony 45WA fresnel screens (eg, is WA = wide angle?) Thanks for your feedback. Steve
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