Brilliant x100 AF failure implementation

gavinlg

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With all the negative talk about the x100's AF which is (in my opinion) rather unjustified, I'd like to present a little hidden gem I found with my x100 in use.

It's true that the AF system needs contrast to get a lock, and it's true that the tolerance for how much contrast is needed is lower than a good dslr, however Fujifilm decided (in a stroke of brilliance) that if the camera can't acquire an AF lock, that it will automatically default the focus to a distance of around 3 meters, whilst showing the 'red box' or 'AF lock failed' icon. You can still take the photo of course, and in street style photography, it gives a decent enough depth of field so that you generally have a pretty good chance of getting what you need in focus (imagine a 35mm f2.8 lens set at 3m focussing distance on a film camera).
If you again stop down to f2.8, you're getting f4 equivalent depth of field on a film camera, which means usually a subject mid-frame on the street is still going to be in focus, even if the camera has failed to lock.

This implementation is absolutely brilliant - I've got quite a few photographs taken in super low light (iso 3200, f2, 1/30th) where I couldn't get a focus lock but still took the shot, and the photographs came out in focus. All other AF cameras seem to rack in and out and end up on the near or far focus setting when they're finished.

Just another little thing that makes me believe fujifilm really designed this camera for photographers.
 
Has Fuji in any way disclosed this gem of wisdom in their literature?

I have no idea - I've never read the manual. I don't think I've seen it posted anywhere either. I remember the e-p1 I used to have - if it couldn't lock the AF it would just rack the lens in and out and in and out, and settle for either infinity or 10cm focussing distance. Same goes with my 5d.
 
I like your positive way of looking at negatives.

I don't think the x100's AF is a negative at all. I think it's quite good. Me and the other photographers on this forum that actually use them, some of which are actual pro photographers.

All AF cameras will fail to achieve lock at some point. The difference is that the x100 can go on taking pictures with a little bit of knowledge of how it works. Try that with any other mirrorless AF camera, without fumbling around with screen zooms.
 
The X100's biggest weakness with regards auto focus is the failure by Fuji to fully and clearly articulate how to use it properly. Those of us who have taken the time to work with the camera have learned to get exceptional results. AF is fine.
 
I usually try to stay out of the gear arguments on this forum as it seems that there is a large group who will not be satisfied until there is a ff digital rangefinder that is sold at prices that would bankrupt the company selling it. BUUUUUT.
Having shot with an x100 for a few days now I'm surprised at how many people bash it. It is such a capable little camera. I bought mine as a digital replacement for my Contax t2 and it far surpasses my expectations in that role. I think the price is about the same too if you are comparing MSRP at launch. Maybe people just expected too much? I was showing it to a regular at my bar who is a long time Leica shooter and retired pro and he was VERY reluctant to give it back, he couldn't stop raving about it. It's a tool for a job and the job is does is excellent, in my humble opinion.
 
keep digging Gavin!

PS bash away i say. my x100 has pumped out brilliant photos and will continue to do so... as such, i feel no need to defend it.
 
I shoot concerts about once a week, and the X100 has been wonderful once I got comfortable with it. I can't see most people shooting in worse lighting conditions than I do, as these aren't arena shows with big lights. I also use it for daily newspaper assignments. My newspaper has D3X's and D300s's with f2.8 zooms, and I choose to use my X100 for the majority of assignments. I use their equipment for sports, although the 5fps of the X100 is an added bonus for me that helped with a softball pitching sequence this week.

The X100 AF fills my needs splendidly.
 
The X100's biggest weakness with regards auto focus is the failure by Fuji to fully and clearly articulate how to use it properly. Those of us who have taken the time to work with the camera have learned to get exceptional results. AF is fine.

Totally agree - they should have included tips or a guide in the manual. Using the 'corrected af frame' which is the last option in the bottom menu is also totally crucial IMO - then you know exactly where to focus for close or far shooting.

I shoot concerts about once a week, and the X100 has been wonderful once I got comfortable with it. I can't see most people shooting in worse lighting conditions than I do, as these aren't arena shows with big lights. I also use it for daily newspaper assignments. My newspaper has D3X's and D300s's with f2.8 zooms, and I choose to use my X100 for the majority of assignments. I use their equipment for sports, although the 5fps of the X100 is an added bonus for me that helped with a softball pitching sequence this week.

The X100 AF fills my needs splendidly.

Similar story with me, I have barely used my 5d since getting the x100 in October 2011. The x100 was meant to play backup and non-serious camera, but as it turns out the 5d has become the backup to the x100!

I wondered why my rushed street shots were coming out Ok!

Thanks for filling me in! Fuji is brilliant, IMO.

Yes, this is how I discovered it - on the occasion where it's too dark to focus I've been taking the shots regardless, and most of them have still been coming out well. It really shows that the team who designed it are actual photographers, not just engineers or technicians.
 
I just tried this in MF mode and using the AF-L button to focus really close up. The scale defaults to 3m every time. Useful bit of knowledge.

This means that if you shoot at f11 with the subject >3m away, every shot will always be in reasonable focus, even if AF fails.
 
What is to learn about the AF?
You point the camera at what you want to take the picture of and press the shutter button.

The X100's biggest weakness with regards auto focus is the failure by Fuji to fully and clearly articulate how to use it properly. Those of us who have taken the time to work with the camera have learned to get exceptional results. AF is fine.
 
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