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Thread: A7/A7R silly question?

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    Senior Member Rawfa's Avatar
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    A7/A7R silly question?

    Since Sony them selves said that some e-mount lenses may cover the FF mount on the A7/A7R, would it be possible to use a focal reducer (speedbooster, lens turbo, etc) on them?

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    Senior Member Rawfa's Avatar
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    Re: A7/A7R silly question?

    From Sony NEX System : Canon EF Lens to Sony NEX Speed Booster I can see that at least the metabones version won´t cover the full frame:

    "This Speed Booster™ is designed to cover an APS-C image circle which is not big enough to cover a full-size 36mm x 24mm sensor."

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    Re: A7/A7R silly question?

    Quote Originally Posted by Rawfa View Post
    From Sony NEX System : Canon EF Lens to Sony NEX Speed Booster I can see that at least the metabones version won´t cover the full frame:

    "This Speed Booster™ is designed to cover an APS-C image circle which is not big enough to cover a full-size 36mm x 24mm sensor."
    That is correct. No lens you mount with the SB will cover the FF (already checked to be sure). That is the nature of the design.

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    Re: A7/A7R silly question?

    That´s too bad. I could already imagine some fast super wide angles

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    Re: A7/A7R silly question?

    What I said applies only to the Speed Booster. That gives ~tele-centric projections (that is the whole point).

    The knock offs may not do that though.

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    Re: A7/A7R silly question?

    A7R and a 85 f1.2 prime... that could be my next portrait choice camera
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    Re: A7/A7R silly question?

    Quote Originally Posted by kweide View Post
    A7R and a 85 f1.2 prime... that could be my next portrait choice camera
    Nikon F mount.

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    Re: A7/A7R silly question?

    Quote Originally Posted by Rawfa View Post
    Since Sony them selves said that some e-mount lenses may cover the FF mount on the A7/A7R, would it be possible to use a focal reducer (speedbooster, lens turbo, etc) on them?
    Haha

    I was thinking exactly the same thing, the "Speed Reducer" would essentially have an optical lens set that would have to take a APC-C image, and magnify it to fill a full frame sensor. The outcome would be a much lower resolution image on full frame and sacrifice of approx 1 stop of light.

    Any advantage of doing this would be lost, so not only would you end up with a lower IQ full frame high resolution image, but also you would lose 1 stop of light.

    No go I think

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    Re: A7/A7R silly question?

    Metabones Canon EF Lens to Sony NEX Smart Adapter (Mark III) is Metabones third-generation Smart Adapters allow you to mount Canon EF and EF-S mount lenses on Sony a7R and a7 full-frame cameras. It retains existing features such as a detachable AS-style quick release plate, chrome-plated brass for all mounting surfaces, EXIF, autofocus and image stabilization (IS) lens support.

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    Re: A7/A7R silly question?

    I hope they're working on a speedbooster for hasselblad lenses.

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