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  1. #1

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    Fuji GF670 focus issue

    I recently got a barely-used GF670 (bought new in January). I love it, but it may have a focus issue. Here's the story:

    To check the rangefinder's accuracy, I focused on a single point from multiple distances, starting about 12 meters away and working my way to about 1 meter. I aligned the rangefinder image as carefully as possible each time, of course. Shot everything at f/3.5. Well, the first half of the shots are a bit soft where I focused and sharp about 3-4 meters behind; very disappointing. But the second half are sharp where I focused. Is it possible that the rangefinder could be accurate at close distances but off at farther distances? Or, if it's accurate at any distances, is it necessarily accurate at all distances? I'm not sure if I missed focus, or if there's a problem.

    After seeing those first test results, I shot the same test again, at f/4. Focusing very carefully again. And -- same results. Which makes me think there's an issue with the camera.

    If that's the case, is this a repair any decent repair place can do? (I live in L.A.) Or does it need to go to fuji?

  2. #2
    Ken Nadvornick's Avatar
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    I purchased my GF670 new. When it arrived the rangefinder was off. I have read that this is not unusual for this camera. I realigned it myself by driving to an overlook and using the vertical lines of a multistory hospital building located 4+ miles away on a line. Setting this to be infinity seemed to do the trick. My pictures are now all sharp. Although admittedly I have not performed a critical focus test. But so far there does not seem to be a need.

    Before sending it off I would try selecting a target much further away than 12 meters, then calibrating to that as infinity. Then see how close the intermediate distances are to correct. I would also not expect absolute perfection from any camera. Normal stopping down should cover any minor discrepancies.

    Ken
    "They are the proof that something was there and no longer is. Like a stain. And the stillness of them is boggling. You can turn away but when you come back they’ll still be there looking at you."

    — Diane Arbus, March 15, 1971, in response to a request for a brief statement about photographs

  3. #3

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    Thanks for the reply, Ken. I'm definitely aware of not expecting perfection from any camera -- I've been using a Hassy and a Rollei TLR for 10-12 years. Both are great, both have shortcomings. But I do expect focusing accuracy, and I don't want to rely on stopping down. Handheld shooting in low light (at wide apertures, obviously) is one of the things I like best about this camera.

    Questions:

    - Before recalibrating, when you set the lens at infinity, could you tell that it was off? Meaning, did the split images (of the building 4 miles away) not align?

    - How did you realign / recalibrate the rangefinder?

    Thanks again,
    ethan

  4. #4
    Ken Nadvornick's Avatar
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    Correct, the split images did not align. They were noticably off. The sense was that the focusing ring would have needed to turn a little further beyond its infinity stop in order to bring them into proper alignment.

    The recalibration was pretty standard. Underneath the hotshoe mount there are three visible adjustment screw heads. The one on the right sits higher than the other two. I adjusted the middle set screw until the hospital images were perfectly horizontally aligned. Meaning, when I rotated focus to the infinity stop, the vertical lines of the building clearly snapped into sharp alignment.

    Getting to these screws can be a bit baffling the first time. One must first slide the flat silver spring tensioner plate off toward the rear. There is a microscopically small pry-off slot in the front edge of the circular black plastic piece that contains the round metal flash contact. A very small, flat jeweler's screwdriver blade is needed to initially lift the tensioner plate for removal by sliding it over that contact. After that, it's pretty obvious, with four small Phillips head screws holding the shoe itself to the top plate. Once the shoe is removed, the adjustment screws inside the top plate will be easily seen.

    If you try this, a few words of caution. You will need a very small diameter extended screwdriver blade to reach the adjustment set screw. I had to purchase a separate precision set just to find one with a long enough reach. It must also be very narrow, otherwise you can't also see into the hole to properly set the blade.

    And once properly set into the screw head slot, you must be careful not to press down with any force. Although I can't see the entire mechanism through the hotshoe, my sense has been that this adjustment screw seems to itself be located on a moving part. I could be wrong, but that's how it feels. I've noticed that if I press down even slightly, without even rotating he screw itself, the patch alignment is severely altered. Usually for the worse.

    It's a very delicate adjustment. At least for me. Once you get close, it then becomes a series of gentle trial-and-error final attempts until you finally hit that perfect alignment.

    Hope this helps.

    [Edit: If anyone else out there has also attempted to adjust their own GF670 rangefinder, I'd love to hear your details. Especially any knowledge as to whether those set screws are indeed mounted on moving parts.]

    Ken
    Last edited by Ken Nadvornick; 05-11-2013 at 01:21 AM. Click to view previous post history. Reason: Added [Edit]...
    "They are the proof that something was there and no longer is. Like a stain. And the stillness of them is boggling. You can turn away but when you come back they’ll still be there looking at you."

    — Diane Arbus, March 15, 1971, in response to a request for a brief statement about photographs

  5. #5

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    Ken -- this is great. I may ultimately just send it to Fuji. I'm fairly mechanically adept, but I'm not sure I want to be messing around with something delicate about which I know nothing. I'm keeping your post on record though. Really appreciate it.

    And for anyone else out there reading this thread, don't let it dissuade you from buying the camera. Everything you've read is true. It's light, portable and well-made. The shuttter is nearly silent. The viewfinder is large and bright. And the 80mm focal length is just about perfect on 6x7, in my opinion.

  6. #6

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    It would be very interesting if you could tell us that such were the costs and the time it took, and if I am satisfied with the repair and treatment, thanks
    xuco Martin

  7. #7

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    To complete this thread, here's what happened: I sent the camera to Fuji. It's still under warranty, so service was free. They sent it back with this note: "I checked the RF and focus. Camera checks to factory specs. I had several people look at the film that was sent under a loupe and light box. The test shots sent are not a good way to check RF and focus." That's it. No details on what's wrong with the test shots, or what would have been a better way to check RF and focus. I'm going to try and shoot a side-by-side test with someone else's gf670.

  8. #8
    benjiboy's Avatar
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    I'm surprised if you aren't the original buyer of the camera that Fuji honoured the warranty because in my experience of working in camera stores for more than twenty years the guarantee on new equipment is only applicable to the original purchaser, and is not transferable to subsequent owners.
    Ben

  9. #9

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    Yep -- they were fine with it. It's a one-year warranty, and all they needed was the receipt showing the serial number and date of purchase.

    I've managed to disassemble my Arca Swiss 6x9 ground glass and fit the glass to the back of the GF670. Going out to do another focus test.



 

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