• Increase maximum aperture by 1 stop.
• Increase MTF.
• Makes lens 0.71x wider.
• Optics designed by Caldwell Photographic in the USA
• Electronic integration of aperture diaphragm, controlled by or from the camera body
• Partial autofocus support for late-model (post-2006) Canon-brand lenses
• Powered by camera body, no external power source required
• The tripod foot is detachable
• High performance 32-bit processor and efficient switched-mode power supply
• Supported: EF (full frame) lenses
• Image stabilisation (IS)
• Electronic manual focusing (e.g. EF 85/1.2L II and discontinued EF 50/1.0L)
• EXIF (focal length, aperture, zoom range)
• P, A, S, M exposure modes
• Autofocus (subject to compatibility)
• Distance and zoom display on VG and FS series camcorders (see note 1)
• Auto magnify (see note 1)
• Sigma, Tamron and Tokina lenses in Canon EF mount (see note 3)
|EF Back Cap||1|
|EF Mount Front Cap||1|
17 July 2017
Speed Boosters are well known in the video world, but how do they perform for photographers?Read full article
Autofocus speed is very slow for most moving subjects. The autofocus speed is unfit for professional use and it would disappoint most enthusiasts.
NEX-VG900 (see note 4)
Lens correction such as peripheral shading, CA and distortion
Focus confirmation "chip" (e.g. Dandelion)
M42 screw mount adapters (see note 6)
Stacking non-Metabones/non-Conurus mount adapters on top (see note 7 and list of lenses which require modification below.)
Super-telephoto lenses (see note 8)
1) Requires lenses supporting distance information.
3) A third party zoom lens may need to be registered with the Smart Adapter first in order to detect its maximum aperture. Autofocus is disabled for most third-party lenses.
4) 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.
5) Sony NEX cameras cannot display aperture values beyond f/1.0. If a f/1.2 Canon EF lens is used with Speed Booster, the resulting aperture is f/0.9 but the camera body displays f/1.0.
Autofocus is supported, with the following known limitations:
Autofocus speed is very slow and inadequate for most moving subjects. The autofocus speed is unfit for professional use for sure, and it would disappoint most enthusiasts.
Only Canon-branded lenses introduced in or after 2006 are officially supported. Autofocus is disabled for older Canon lenses and most third-party lenses, including most Sigma, Tamron and Tokina lenses.
On FS series (e.g. FS700, FS100), autofocus may be available only in photo mode but not in movie capture mode.
Continuous AF is not supported.
DMF mode (direct manual focus) is not supported.
For non-camcorder camera bodies (e.g. NEX-7), during movie capture, if the subject moves to a different distance, half-press the shutter release button to re-activate autofocus and lock onto the subject again. Since autofocus speed is slow, there may be visible disruption in the resulting footage.
The first two autofocus attempts are used to calibrate the lens and as a result may not lock successfully on the target. Half-press the shutter release button again and autofocus will lock successfully.
Autofocus may have difficultly locking onto subjects which are very close to the nearest focusing distance of the lens.
Autofocus accuracy depends heavily on the working condition of the lens. Lenses with hidden problems which may not be apparent on Canon DSLRs will lead to inaccurate and unreliable autofocus on Sony NEX. Typical problems of this kind include an unsmooth/erratic autofocus mechanism (e.g. getting stuck intermittently at a certain focusing distance), a faulty/worn-out distance encoder or other faulty/worn-out internal sensors.