I have almost decided to get a Shen Hao PTB45 + 65mm and 90mm lenses + 6x12 / 6x9 roll film holder. Questions: 1) does the PTB45 need a bag bellows or/and recessed lens board for movements with the 65mm (when shooting 6x9)? 2) for 65mm and 90mm lenses, would it be wise to get an Ebony screen with wide-angle fresnel ? Or could I manage with the standard Shen Hao screen as I mainly will shoot 6x9 and 6x12? 3) could an Ebony screen with wide-angle fresnel be used with longer lenses, say 150mm or 250mm? Any help appreciated !