Mamiya 645 Pro 150mm f/2.8

While the price is quite a it more compared to the Mamiya 150 f3.5, this lens offers ULD glass which provides greater color fidelity. The image in the viewfinder is a joy to behold. It is very bright and makes focusing a breeze. I bought this one used, which certainly helped in terms of the price. Having used both of the Mamiya lenses in this focal length, I would recommend springing the extra dollars for the f2.8. It is an excellent lens for portraits. The only reason for giving 4 stars for value is because of the high price. However, you get what you pay for.

Solid build quality, f2.8 lens that provides a bright image in the viewfinder.

Heavy

Mamiya 150 f3.5

None needed