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by evan-pak

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Fujifilm currently makes three lenses for their new X-Pro1 mirrorless camera system:

"Fujinon" is Fujifilm's lens division. The "X" stands for "X-mount", where the letter X comes from "X is a letter which sounds cool" (in the catalog, they use the term 'X'treme,with no apparent hint of Gen X irony). And "XF" is either all lenses for this mount, or at least the first series of such lenses.

Next, we have the focal length and aperture — straightforward enough. But then all three are suffixed with this "R". I can't find any indication of what this might stand for in the literature, nor can I find it on older Fujinon lenses. So, what does it mean?

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up vote 8 down vote accepted

"R" stands for Ring and means the lens is equipped with an aperture ring.

From Fujifilm's FAQ:

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Oh, nice! They finally put this somewhere official. Thanks! – mattdm Jul 13 '14 at 12:34

In their review of the XF 14mm lens, Digital Photography Review says

The 'R' in the lens name indicates that, like the other XF primes to date, the 14mm has a dedicated ring to control the aperture.

This means that the lens aperture can be either directly controlled by setting this ring (although in fact the connections on this modern lens mount are are all electronic even when using the manual ring), or left in auto mode by choosing A.

In a comment thread, DPR's Andy Westlake adds:

Fujifilm's launch presentation to us about this lens and the XF 18-55mm, given by senior members of the design team in Japan, unequivocally stated that 'R' stands for aperture ring.

Additionally, the newer Fujifilm XF 27mm f/2.8 has no aperture ring — and no 'R'.

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Right, this lens has the ability to be both auto and manual. The Ring pushes forward to become manual. – cmason Apr 3 '13 at 15:29
@cmason: that's for the focus ring. I think the 14mm is the first XF lens to have the manual focus switch feature, but others have the R designation. – mattdm Apr 3 '13 at 15:35
Also a bit off-topic but worth noting that even in manual focus mode, focus is electronically-driven; the ring has no direct connection. – mattdm Apr 3 '13 at 15:38
@mattdm - Fuji has updated their roadmap with a XF 27mm F/2.8 which has an aperture ring but no R in its name. – Itai Apr 17 '13 at 15:01
@Itai And, presumably, no rounded aperture blades? – mattdm Apr 17 '13 at 15:04

I saw this question and I was also curious and according to Fujirumors on facebook it stands for Rangefinder.

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Seems as good a possiblity as any, but I wonder if they are just guessing. – mattdm Apr 27 '12 at 12:36
Very odd. I will has Fuji. I would have imagined something more along the line of rear-focus or reduced flange distance. – Itai Apr 27 '12 at 13:13

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