Nikon 85mm f1.4D AF Nikkor lens mount_Yashica AF The Nikon Speedlight SB-800 is

The Nikon Speedlight SB-800 is a professional on-camera flash that provides full manual control on or off camera

Need to shoot verticals with your Mamiya M645

allowing "shoot through" use with lenses that have an outer diameter of 10cm or less

Not a huge flash

The Nikon 10-24mm f3

Nikon 85mm f1.4D AF Nikkor lens mount_Yashica AF The Nikon Speedlight SB-800 isThe Nikon AF Nikkor 85mm f1. 4D is a professional full frame prime lens for Nikon F mount with a fast f1. 4 aperture and sturdy pro grade construction. This lens is in excellent cosmetic condition, with only minor wear from light use. Light internal dust, no haze of fungus.