Sunday, 12 December 2010

GH2 touch screen AF (superzoom example)

I've previously tested the touch screen AF of the GH2, using the 45mm macro lens.

Here's another example using the touch screen AF with the Lumix G HD 14-140mm superzoom lens. The lens was set to 100mm focal length.



As you can see, the response is still somewhat slow, but the actual focus action of the lens is faster than when using the Lumix Leica 45mm f/2.8 macro lens.

I'm using the A mode on the mode dial. Using the iA mode typically gives me the focus tracking mode, in which the response time from touching the screen until the focus changes is a bit shorter.

When using the shutter button to trigger focus, the focus is very responsive, just like in my study of the GH2 autofocus speed.

When recording videos, you can change the focus areas using the touch screen as well. The response and speed is similar to this example.

I have also made an analysis of the focus speed of the GH2 for a number of lenses, and compared with GH1 for some of them.

8 comments:

  1. G2 reacts immediately, why GH2 is so slow? For refocusing the scene in video mode it is too fast, for stills it is too slow... :-(
    Is it slower than AF using the shutter button?
    According to yor previous post "Panasonic GH2 autofocus speed" at 50 mm focus is at 0,4 sec here we can see that touch AF at 100 mm takes about 2 sec... very poor performance...

    Greetings
    Xaos

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  2. When using the shutter button, the focus change starts at once. But when touching the screen, the focus does not start to change immediately.

    This behaviour seems to depend on the mode of the camera. I always leave the camera in A-mode on the mode dial, however, using the iA mode gives me focus tracking, in which the response is a bit faster.

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  3. Would you recommend the GH2 as a semi-professional camera? I currently own the Canon 7D but it's faulty and I need to send it back.
    All aspects of focusing are important to me, especially speed. Can one change focus modes quickly and i focusing speed fast enough?
    Can the GH2 control an off camera (3rd party) flash?

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  4. Ah forgot...the GH2 has the 1:1 crop mode. So if I got the pancake 20mm f1.7 I could make it a 100mm with the 5x that the 1:1 crop gives me.
    Have you tried the 1:1 crop and is it easy to quickly switch focal lengths this way.

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  5. Thanks for Your response... If You make more test I'd be grateful. I plan to switch to GH2 from my G1 so any information is valuable for me.

    BTW
    Great blog! Your articles are of great value for me as they are from the user perspective. Thank You for Your effort :-)

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  6. Try upgrading the firmware of the 14-140 if you haven't yet. Focus speed should be improved.

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  7. I'm already using the latest version, v1.4.

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  8. Regarding the comparison between the Canon 7D and the Panasonic GH2: I think this is an uneven comparison. The 7D is probably the better camera in most aspects. The only two areas where the GH2 is better are:

    Video

    Compactness

    So unless these two are important for you, I suggest you consider the 7D, which is the more professional camarea all around.

    ReplyDelete