Fuji GX680 lens sizes

There seem to be many many lens for the GX680 all fairly close in size. I happen to have 65mm, 125mm, 135mm, and 150mm lens. I know that there is a 180mm, 200mm, 190mm, 300mm and others. I mainly use the 65mm but have gotten interested in portrait work and so am experimenting with the other sizes.

Could someone explain to me the rationale or strategy for lens sizes with the GX680 ?

Thanks,
Charles

You need one of each.

The dilemma of choice!

The GX680 was primarily a studio/table top camera in it's day, and depending on the size of your studio, the lens choices made sense. The 50 and 65 was primarily for outdoors.

I have the 65, 100, 125, 180, I bought them mostly because they were economical and useful at the time. If I were to get a kit now, I think I'd go for the faster f/3.2 lenses, a little easier to focus in available light.

In Japan, space comes at a very high premium. Offering as many focal-length "options" as possible to photographers gives those photographers "options" when they want to maximize the space capabilities of their studios(many are quite small, especially portrait studios which might not be much bigger than a small dining room).

The GX680 was also being marketed to working professionals as a "large format replacement", with the convenience of shooting rollfilm. Fuji has made large format lenses for a LONG time, and has given those customers many "options" for that, so continuing that trend into the GX lineup was to be expected. It worked very well for them, and the GX product line sold very well, both domestically and in international markets.
Unfortunately for them, they didn't continue their planned migration of the GX680 system into the digital realm: http://www.dpreview.com/articles/5839668318/fujifilmback

-Dan