Bower is the same company as Samyang and Rokinon. This Bower lens is nearly identical to it's Rokinon counterpart with the main difference being the gold ring instead of the red.
This Bower lens is not compatible with our 80mm front rings due to it's scalloped lens hood. Our skilled Cine-Mod technician measured, cut and installed a focus gear and performed an aperture de-click. The aperture de-click requires some light dis-assembly, cleaning of old grease, adding of new high-grade grease and re-assembly.