Time to be with your loved ones

Time to be with loved ones

by sat

submit your photo

Hall of Fame
View past winners from this year

Please participate in Meta
and help us grow.

Take the 2-minute tour ×
Photography Stack Exchange is a question and answer site for professional, enthusiast and amateur photographers. It's 100% free, no registration required.

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?

share|improve this question
Since these lenses are so new, and since Fujifilm is relatively small, this isn't covered by photo.stackexchange.com/questions/496/…, although we should add the answer there once we have one. –  mattdm Apr 10 '12 at 17:46
Maybe this is coincidence but each lenses glass is recessed –  Rob Apr 10 '12 at 18:25
Maybe they're pirated. Arrr! –  MikeW Apr 10 '12 at 19:46
My guess is that since all of the lenses available for the X-mount at release bear the same "R" designation, it must mean "Regular". On a somewhat more serious note, the postfix designation for Fujinons usually referred to the coating, but if they'd followed their old pattern, it should have been XF-R focal length and aperture here. All I know for sure from my GX680 and enlarger days is that each one of those letters added to the price somehow... –  user2719 Apr 10 '12 at 22:45
add comment

3 Answers

The "R" stands for "Radius Angle" and refers to the Aperture Blade design on the Fujinon XF lenses. XF Lenses' diaphragm blades have the radius finely adjusted to ensure the opening is close to a true circle at all aperture settings"

Source: Fuji via me :)

share|improve this answer
Awesome. Thanks for checking with them! –  mattdm May 29 '12 at 1:41
Based on dpreview's comments I'm tentatively changing the answer. Any chance you might check back with your contacts? –  mattdm Apr 3 '13 at 15:25
You want me to send them a Is that your final answer? email? They have already answered and I know the email had to go through a few layers above. It seems convincing and I consider it official. Given the answer, I would be highly doubtful someone at Fuji just made it up. –  Itai Apr 3 '13 at 16:12
Well, maybe ask in light of what dpreview is saying? Someone has to be right. :) –  mattdm Apr 3 '13 at 16:23
See comments on the other post. It looks like the Fujifilm XF 27mm f/2.8 proves the aperture ring theory. –  mattdm Jan 7 at 15:05
add comment
up vote 1 down vote accepted

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'.

share|improve this answer
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
show 4 more comments

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

share|improve this answer
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
add comment

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.