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Thread: focus confirmation

  1. #1
    Jamesmd
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    focus confirmation

    just a stupid little thing , perhaps you already know or it might even come on the user guide, but I just realized that in macro manual focus you get the green dot confirming focus , never saw it before . nice .

    cheers

  2. #2
    Senior Member douglasf13's Avatar
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    Re: focus confirmation

    Yeah, it works well, but it stays on a little long. For my camera, it works best if I focus from the minimum focus distance towards infinity, and pull the trigger immediately after the light turns on. If I start at infinity and go the other direction, I get back focus.

  3. #3
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    Re: focus confirmation

    Unless you don't have enough light... recently I was testing a chipped MF lens and the AF confirm didn't work at all past f5.6. Also, it doesn't work with bellows unless you have a LOT of light.
    α900+VG|F20|2xF58|16-35,24-70,135Z|STF|70-400G|50,85 1.4|16,20,28,100M,80-200APO f/2.8|28-135|500f/8|1x-3xMacro|2xMFC-1000|Tiltall+RRS, Bellows, etc.

  4. #4
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    Re: focus confirmation

    The center focus point should work until F/8...or F/6.3 at least.

    At least it works on the slower Sigma primes (f6.3 or f/7.1, IIRC), the beercan doubled. (f/8), and the 500 reflex (f/8)

    No reason why the chipped MF lens should be any different

  5. #5
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    Re: focus confirmation

    Maybe my issue was that the DOF in this case was ridiculously thin - 135mm @ about 6 ft. Point is, results will vary. It may work at f7 on one lens but not past f6 on another.
    α900+VG|F20|2xF58|16-35,24-70,135Z|STF|70-400G|50,85 1.4|16,20,28,100M,80-200APO f/2.8|28-135|500f/8|1x-3xMacro|2xMFC-1000|Tiltall+RRS, Bellows, etc.

  6. #6
    Senior Member douglasf13's Avatar
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    Re: focus confirmation

    Could it be an issue of not using the red af assist light in manual mode?

  7. #7
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    Re: focus confirmation

    Could be. I need to play with it more, for what I was doing at the time focus was not especially important so I didn't spend a lot of time analyzing the issue.
    α900+VG|F20|2xF58|16-35,24-70,135Z|STF|70-400G|50,85 1.4|16,20,28,100M,80-200APO f/2.8|28-135|500f/8|1x-3xMacro|2xMFC-1000|Tiltall+RRS, Bellows, etc.

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