Fujica GM670

[oldwino]

Just picked up a nice GM670 with the 100mm lens. The camera has additional frame lines for a 150mm lens, but I see that Fuji also made a 180mm lens for these cameras (which requires an external viewfinder for framing).
Which one is the one to get?

 

[santino]

For the sake of convenience I‘d get the 150 mm.