Canon EF SpeedBooster ULTRA T 0.71x Mount Adapter for M4/3 Rental in Japan

Product Summary:

The Canon EF SpeedBooster ULTRA T 0.71x is a highly specialized mount adapter designed for Micro Four Thirds (M4/3) cameras, allowing the attachment of Canon EF mount lenses. This adapter utilizes a corrective lens group to dramatically change the optical characteristics of the attached lens.

By reducing the angle of view by 0.71x, it effectively mitigates the Micro Four Thirds crop factor (resulting in a 1.4x crop instead of 2x) and increases the maximum aperture by approximately one full stop, boosting light gathering ability. It includes electronic contacts for aperture control but is primarily recommended for still photography using manual focus.

Quick Highlights:

• Focal Reduction: Reduces the lens’s focal length by 0.71x.
• Light Boost: Increases the maximum aperture (brightness) by about one stop.
• EF to M4/3 Compatibility: Attaches Canon EF mount lenses to M4/3 camera bodies.
• Electronic Contacts: Allows aperture control from the camera body.
• Primarily Manual Focus: AF performance is limited; best suited for manual focus stills.
• Effective Crop Reduction: Changes the crop factor from 2x to 1.4x.

Product Details / Description:

This SpeedBooster is essential for photographers who want to utilize the superior quality and wide selection of Canon EF lenses on their compact M4/3 bodies while regaining a wider angle of view and better low-light performance. It effectively bridges the gap between the two systems.

About the Product

The adapter features sophisticated optics designed by Metabones. Its main function is to concentrate the image projected by the full-frame EF lens onto the smaller M4/3 sensor. This process not only makes the lens appear wider (by 0.71x) but also concentrates the light, effectively increasing the lens’s speed (e.g., turning an F2.8 lens into an effective F2.0 lens).

The electronic contacts allow the camera to communicate with the EF lens to control its aperture. However, users should note that autofocus performance is highly restricted: continuous autofocus modes (AF-C and AF-F) are not functional, and autofocus does not work at all when shooting video. It is best to treat the adapter as a manual focus tool for both still photography and video.

Key Features

• Optical elements provide a 0.71x focal length reduction.
• One-stop increase in maximum aperture improves low-light capability.
• Electronic communication for accurate aperture setting via the camera body.
• Solid metal construction for durable, professional use.
• Includes a hex wrench for adjusting the mount when necessary.

Specifications

Feature	Detail
Lens Mount (Adapter side)	Canon EF mount
Camera Mount (Body side)	Micro Four Thirds (M4/3) mount
Focal Length Multiplier	0.71x
Aperture Increase	Approximately 1 stop
Electronic Contacts	Yes (Aperture control)
Autofocus Support	Limited (AF-C/AF-F/Video AF not supported)
Recommended Use	Manual Focus Stills and Video

What’s in the box (Included Items):

• Canon EF SpeedBooster ULTRA T 0.71x Mount Adapter for M4/3
• Body Cap
• Rear Lens Cap
• Case
• Hex Wrench

Where This Product Can Be Used:

• Utilizing fast, high-quality Canon EF prime lenses on M4/3 bodies.
• Wide-angle shooting where EF lenses are preferred, minimizing the crop factor.
• Low-light photography and night scenes benefiting from the one-stop light boost.
• Manual focus video and cinematic shooting using EF lenses.
• Achieving shallower depth of field (bokeh) than normally possible with M4/3.

Why Tourists Rent From Us

• English-speaking customer support
• Accept foreign credit cards
• No Japanese phone number required
• Offer hotel & Airbnb delivery
• Easy return for travelers

Book with Jasumo:

If you are ready to rent this product, you can contact us with the Product Name, the Rental start date and end date, your delivery Location, and other important details you want to share. After we get a request from you, our team will start communicating with you as soon as possible.

Faqs:

What is the biggest advantage of renting this SpeedBooster in Japan?

The biggest advantage is the dual benefit of reducing the crop factor from 2x to 1.4x (making your lenses wider) and increasing the maximum aperture by one stop. This allows you to use your favorite Canon EF lenses with better wide-angle performance and better low-light capability on your M4/3 camera body while traveling.

If I attach a Canon 50mm F1.4 lens, what is the effective focal length and aperture?

If you attach a Canon 50mm F1.4 lens, the effective focal length becomes 50mm x 0.71 = 35.5mm (a comfortable standard view). The effective maximum aperture becomes one stop brighter, effectively F1.0, dramatically improving low-light performance and shallow depth of field.

Why is autofocus functionality limited on this adapter?

Focusing is slow and often unreliable because the adapter is passing electronic signals between two completely different camera systems (Canon EF lens and M4/3 body). The adapter prioritizes optical performance and aperture control over high-speed autofocus functionality.

Is this recommended for professional video shooting?

It can be highly recommended for cinematic video shooting that relies on manual focus. It allows for shallower depth of field and better light transmission, both highly valued in video. However, you must use manual focus and preferably an external microphone due to potential drive noise.

What does the phrase “The angle of view becomes 0.71x” mean?

It means the lens will appear 0.71x wider than it would on a native M4/3 lens. For example, the 2x crop factor of M4/3 makes a 50mm lens look like a 100mm. With the 0.71x reduction, the crop factor is effectively 2x multiplied by 0.71 = 1.4x, so the 50mm lens now looks like 70mm.