Mamiya Mamiya-Sekor Macro Z 140mm f/4.5 W

Pull this one out of an RZ67 kit and the first thing you notice is the heft. The 140mm Macro sits in the bag next to the 110mm normal and the 180mm short tele, and it is the lens product shooters reached for when a client needed a watch face, a ring, or a bottle of perfume filling the 6x7 frame with no perspective games. Tabletop studios in the 1980s and 90s ran on this glass. It focuses close on its own, reaching about a third life-size on the camera's built-in bellows, and with its own floating element system and both auto extension tubes it gets all the way to life-size on a negative that is already enormous.

Optically it behaves the way a dedicated macro should. It is corrected for flat-field work, so a copy of a document or a coin comes back sharp edge to edge with no smearing in the corners, none of the field curvature that a fast portrait lens hides behind shallow depth. Wide open at f/4.5 it is already crisp in the center; stop to f/8 or f/11 and the whole frame snaps to a clean, even contrast that holds detail without looking harsh. Color is neutral and faithful, which matters when the job is reproducing a product accurately rather than flattering it. Bokeh is calm and unremarkable, smooth circles, nothing swirly or characterful, because nobody designed a copy lens to draw attention to its out-of-focus rendering.

The "W" trips people up. It does not mean a later or better-coated version. It just marks the wide aperture ring with extra half-stop detents, and it is optically identical to the earlier non-W lens. What actually matters here is that the leaf shutter lives in the lens itself rather than the body. That is the practical reason studio people loved the RZ system: flash syncs at every speed up to 1/400, so you can drag a strobe against bright ambient and kill the background, or freeze a splash of liquid mid-pour. The trade-off is the slow end. The electronic shutter only times itself out to a handful of seconds, so any longer than that you are on Bulb or Time, and very dim work asks for care.

Here the macro reality bites. As you rack the lens out toward life-size, you lose light to extension, and a handheld meter reading at the subject will overexpose because it does not know how far the lens has traveled. This is exactly the bellows factor problem, and it is where Zone Light Meter earns its place on the focusing tripod: feed it your extension and it computes the compensation so your f/11 stays f/11 on the film. At 1:1 you are giving up around two stops, and guessing it wrong on a 6x7 chrome is an expensive mistake.

The honest weakness is that this is a one-job lens carried in a heavy system. It is not a walkaround, it is not a portrait lens despite the focal length looking right for one, and the RZ67 itself is a brick that wants a tripod. Today the 140mm Macro Z trades cheap because the demand evaporated with the studios that bought it. People still pick one up when they want clinical close-focus detail on real medium-format film, and at the price it undercuts almost anything digital that touches that resolution. The rival was always the rest of the RZ lineup; against them, this is the specialist you mount when nothing else will get you close and flat at once.