This filter holder allows to use 100mm flilters with the lens in super wideangle mode. When digitally corrected (in conjunction with the E-M1 II), no vignetting occurs.
You need 4 screws to mount the hood to the inner ring. Use either set screws (M5 x 10) or the fixing screw I provide here in the shop. Using 3 set screws and one of the fixing screw
s (or another screw you can easily turn by hand) keeps the holder together and allows blocking rotation if needed.