Metabones Speed Booster Review (NEX 7) Part III – Canon EF 50 f1.2 L USM

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13 Responses

  1. Corwin says:

    Still cheaper than buying new lens.. or well, some of them. 😀

    Results from 50/1.2L are not that bad, still seems pretty usable. And there are pretty much no lens that have same style as 50/1.2L (well, maybe Fujinon EBC 50/1.4, but its not same :).

  2. Andrew says:


    many thanks for the review! Any chance to test one of your Pentax PK lenses with a Pentax K to Canon EF adapter? 🙂 It would be great if that could work! Of course without AF and A Mode, but it would give me the opportunity to use my old Pentax lenses @ FF (without aperture lever modification).

    Many thanks!

  3. I have the Mitakon 35mm f0.95 and use it for only black and white stills as it suffers greatly from pixel shading wide open, having an effective T stop of around 1.4 as well as a very strong colour cast. The lens coatings seem very weak so then lens also suffers from flare, poor colour and very noticeable colour fringe around any contrasting edges. In black and white it is very sharp in the centre but falls off quickly in the corners and exhibits pronounced field curvature. The lens feels well built, heavy and smooth to focus. Aperture is step less, although the depth of field is shallow, veiling wide open makes it tricky to focus without magnification and the bokeh is inconsistent, sometimes looking lovely and smooth, then other times when there are repeating patterns or specular highlights, busy and just generally messy. So my advice is to look elsewhere for a fast lens for video.

    Here are some examples from the lens, some are available at full resolution.

    I have the also have the Speedbooster and 50mm f1.2L which although not perfect gives me a much better looking shallow depth of field shot. I have been testing other lens with the speedbooster at my local camera store, while testing various Canon L and Zeiss lenses to see how well they play with the adapter, I tried the new Sony 35mm f1.8 OSS which for the money is excellent.

    Thanks for taking the time to share your own experiments with the adapter and lens combinations, keep up the good work and please share any super combinations you find in the future.

  4. mazorserate says:

    I have a similar setup with Canon 50mm f1.2L on Metabones EF to NEX speed booster on a 16mp NEX body. The difference is I am using a NEX 5r. No matter how I stop down the aperture on the 50mm to maximum f11, I cannot get the image to hard vignett. Is it possible different speed boosters are manufactured differently?

    • Metabones didn’t announce a word about changing its original design of EF/E speed booster. There is probably newer firmware, but that won’t affect hard vignetting. Most probable cause that emphesize or reduce vignetting effect is adjustment of the rear glass element in irder to achieve infinity focus with some lenses. At different settings, this element cause different amount of vignetting. If you have only EF 50/1.2L and you can focus on the infinity withous seeing vignetting – good for you.

  5. Thanks for review, it was excellent and very informative.
    thank you 🙂

  6. Mario says:

    WOW. I ll donate for that post. I just got the a6000 and I don’t know if I should get the SB for my 50 1.2 or if I should just sell my 50 and get the Sony 35 1.8 0ss.

    I am torn between the outstanding low DOF of the 50 1.2 and the small size (for street photography) and IS of the 35.

    In case I want to keep my 50 I will have to spend an additional 650$ on the SB. While switching to the 35 brings money back to my pocket.

    So I guess I am better of letting go the outstanding low DOF :_(

    • Hi Mario,
      I sent you link with an overview of three focal reducers, in the reply to your previous post. I think that article might be of an interest for you, as lens Turbo II is much cheaper than Metabones Speed Booster Ultra. (149 USD).


  1. November 5, 2014

    […] Canon EF 50/1.2L is one of the lenses that I tested initially when first Speed Booster was announced, and while I was overall impressed with system performance, there were some shortcomings, mainly hard vignetting at small apertures and smearing in the extreme corners. If you are interested, you can check that initial review here – […]

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