Metabones Contax Yashica Lens to Sony E-Mount Camera Speed Booster ULTRA

Metabones Contax Yashica Lens to Sony E-Mount Camera Speed Booster ULTRA

Metabones Contax Yashica Lens to Sony E-Mount Camera Speed Booster ULTRA

B&H # MESPCYEBM2 MFR # MB_SPCY-E-BM2
Metabones Contax Yashica Lens to Sony E-Mount Camera Speed Booster ULTRA Back Mount

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Product Highlights

  • Contax Yashica Lens to Sony E-Mount Camera
  • Ultra-High Index Tantalum-Based Glass
  • Increases Maximum Aperture by 1 f/Stop
  • Increases Angle of View by 0.71x
  • Infinity Focus Adjustment
  • Detachable Tripod Foot
  • Black Matte Interior; Black Exterior
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Metabones MB_SPCY-E-BM2 overview

  • 1Description

The Contax Yashica Lens to Sony E-Mount Camera Speed Booster ULTRA from Metabones improves upon the original Metabones Speed Booster with a 5 element/4 group optical design that incorporates ultra-high refractive index tantalum-based glass for improved sharpness and reduced distortion and vignetting. The Speed Booster ULTRA allows a full frame Contax Yashica lens to be mounted to an APS-C format E-Mount camera and in doing so, increases the angle of view and increases the maximum aperture by approximately one f/stop. 

When a lens intended for full frame sensors or 35mm film is mounted to a camera with an APS-C sized sensor, it transmits a larger area of light than the smaller sensor was built to accept and therefore the effective angle of view of the lens decreases. The Speed Booster condenses light from the lens and projects it onto the APS-C sensor allowing the sensor to utilize all of the lens' light and effectively reduces the crop factor of and APS-C E-Mount camera from 1.5x to 1.07x, producing a full-frame angle of view with an APS-C sensor. A corresponding increase in the maximum aperture of one f/stop makes the lens more effective in low-light situations and able to create a shallow depth of field. 

Metabones Speed Boosters are quality made using precision-machined brass with chromium plating on both the camera body and the lens side of the booster in order to ensure smooth mounting, quality aesthetic, and durability. This adapter has a detachable tripod foot that is compatible with Arca Swiss, Markins, and Photo Clam ball heads.

Although the lens will fit physically, automatic diaphragm (AE metering), or other auto functions are not retained using this speed booster. These speed boosters are only fully compatible with mirrorless cameras housing APS-C or smaller image sensors. They will physically fit the Sony full frame mirrorless cameras, but the camera must be set in Crop Mode to fully support the speed booster's functions.

Allows a full frame Contax Yashica lens to be mounted to an E-mount APS-C format camera and in doing so, increases the angle of view and increases the maximum aperture by one f/stop.
The Speed Booster ULTRA design incorporates ultra-high index tantalum-based optical glass for enhanced optical performance with improved corner sharpness and reduced distortion and vignetting. This glass technology and optical design perform extremely well with professional-grade f/2.8 zoom lenses and high-speed fixed focal length lenses such as a 50mm f/1.2 which will perform as a 35.5mm f/0.9 lens with high contrast and resolution from the center to the edges of the image.
Precise fit and solid connection - lens has no play, gap or wiggling when mounted on speed booster and no adjustments are required to fit your lens. Both the camera-side and the lens-side of the speed booster are made of brass which is precision-machined and chrome-plated.
The Speed Booster uses matte-black treatment to keep internal reflection to a minimum in order to maintain the maximum optical quality possible with the lens. The exterior features a black satin surface finish.
Designed to reach infinity focus while maintaining the correct registration distance required to maintain optical quality of CRC lenses or lenses with floating elements.
The speed booster features a detachable tripod foot which is compatible with Arca Swiss, Markins, Photo Clam ball heads.
Although the lens will fit physically, automatic diaphragm (AE metering), or other auto functions are not retained using this speed booster.
In the Box
Metabones Contax Yashica Lens to Sony E-Mount Camera Speed Booster ULTRA
  • Front Cap
  • Rear Cap
  • Detachable Tripod Foot
  • Limited 1-Year Warranty
  • Table of Contents
    • 1Description

    Metabones MB_SPCY-E-BM2 specs

    Adapter
    Camera Mount Sony E (APS-C)
    Lens Mount Contax/Yashica
    Magnification 0.71x
    Optical Design 5 Elements in 4 Groups
    Physical
    Weight 6.8 oz / 193 g
    Packaging Infodvbcvxwqauva
    Package Weight 0.75 lb
    Box Dimensions (LxWxH) 4.331 x 4.252 x 2.441"

    Metabones MB_SPCY-E-BM2 reviews

    Contax Yashica Lens to Sony E-Mount Camera Speed Booster ULTRA is rated 1.0 out of 5 by 1.
    Rated 1 out of 5 by from It serves its purpose, but it's poorly crafted. This review addresses specifically the Contax-mount to E-Mount Metabones Speed Booster Adapter. I have other Metabones adapters for my EF lenses to Sony E-mount ( I shoot with both an FS5 and an a6500), and those adapters are great. This one is not. I'm only keeping it for reasons that I get to at the end. It works, but it comes with the following poorly designed features: First, the Contax lens release button is terrible. It's a recessed, concave button. Who would design it that way? The button is almost under the the outer circumference of the barrel, and you have to dig your fingernails or thumb in to get the lens to release. Every other lens adapter I've used has a button that sticks out so you can get to it better. Second, most other lens adapters have a lens release that uses a lever and a pivot. I'm talking the expensive Novoflex adapter down to the cheap Fotodiox or cheaper Fotasy one I first bought on Amazon. The action on these other adapters works well, and the button is elevated from the barrel of the lens so you can press it easily. This Metabones release button however just presses against a plate via friction. What it means is that the action is not smooth, and I have to press the button down and forward towards my Contax lens for it to work well. If I press it straight down or back, it's sticky and doesn't press too well. And sometimes it won't even push the latch back far enough to release the lens. Also, after messing with it for just an hour after I received it, black paint started to chip of the button. That hasn't happened to me before. What kind of button chips its paint? And for emphasis, I'm going to repeat that the button is nearly recessed into the barrel of the adapter and is concave. You're going to have to use your nail or a bony finger. What a terrible design. After all that, once you get the lens on, you can still rotate the lens back and forth about a millimeter or two. I didn't measure the free play, but it's enough to be noticeable. Now for the actual Contax mount. The machining tolerances are such that it actually scraped black paint off of the mounting surface of my Distagon 35mm and Planar 85mm lenses. I couldn't believe this. Lastly, and this was simply a correctable nuisance, the Speedbooster optics weren't collimated properly, so I had to adjust it for infinity focus. I went onto the Metabones website for instructions on how to do this, and found that on their page with directions, the jpeg link that gives a visual example is broken (Is that the right technical term? The jpeg won't load up). I had to search on Youtube and find a visual that way. Two reasons why I'm keeping this; only two reasons, and I can't say they are financially worth it. I can use my Distagon 21mm 2.8 on my FS5. With a crop sensor and the Speedbooster, it's like I have a 23mm 2.0. Second reason: I should street videography etc. discreetly with my a6500. I used to have my Distagon 35mm 1.4 on to get a medium focal length, and the lens was large, and more expensive. Thus it was less discreet, heavier, and I was more protective of my expensive lens. Now I have my planar 50mm 1.4 - less expensive, smaller and lighter, and it's like carrying a 54mm 1.0 around. And that extra stop allows for me to shoot longer into dusk. Those are the only reasons I use this adapter. Artistically that wide angle and the 1.0 come in handy in the rare times when I need them, but that's it. I found no gratification in spending nearly $500 on this adapter. Once again, I'll state that my other Metabones adapters are great; this one is not. I wish I could recommend that you buy the EF Speed Booster instead and then use a Contax-EF adapter, but I've "heard" that on the EF Speed Booster, the electronic contacts will hit the aperture pins on your Contax lenses. If that's not the case, that might be a better way to go. In conclusion, if you are considering this adapter, I hope this review gives you a perspective to make a more educated decision on your purchase.
    Date published: 2018-07-02
    • y_2018, m_12, d_4, h_18
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    • clientName_bhphotovideo
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