Mamiya 7II firing late or not at all with 150mm lens

[Mono-P]

I have just discovered my 150mm lens is firing some seconds after pressing the shutter release or sometimes not firing at all. All the other lenses (43, 50, 65 & 80) are working fine. Anyone experience this?

 

[Benjamin Marks]

No, but these are leaf-shutter lenses. My theory, based on other leaf-shutter lenses, like those from Hasselblad and various large format brands is that what you are experiencing is gummy lubricants (or use of the wrong lubes by a ham-handed tech). You have a CLA in your future for this lens. Should clear things right up.