Safety Precautions1.Do not stare at the sun or a bright light source through the lens with the Extender attached,or with a camera with the Extender and lens attached.Doing so could result in visual impairment.In particular,do not look at the sun directly through the lens with the Extender attached,otherwise it could result in loss of vision.2.Do not leave the lens with the Extender attached,or a camera with the Extender and lens attached in the sun without the lens with the Extender and lens attached in the sun without the lens cap on.Otherwise it may result in concentrating the sun’s rays , causing a fire.3.Do not leave the Extender in excessive heat places, such as in a car with direct sunlight.High temperatures can cause the Extender to malfunction.

① Lens mount index(on lens)② Lens mount index(on camera)③ Lens release lever④ Contacts⑤ Rubber ringPlease read the instruction manual carefully before using the product.product.Please keep the instruction manual properly for future reference.Please use the product properly on the basis of fully understanding the content.

Usable Lenses

YONGNUO Extender EF 1.4x III User Manual

First attach the Extender to the lens,then attach it to the camera. Please follow the opposite procedures to disassemble. To detach the Extender from the lens,push the lens release lever as shown by the arrow,then turn the Extender counterclockwise.

When Extender YN EF1.4x III is attached,the lens maximum aper-ture will be smaller by 1 stop.In the above two case, the camera will compensate the exposure automatically.

CautionDo not attach two or more Extenders on the same camera.Doing so will degrade the optical performance and the camera will not be able to obtain proper exposure readings.In order to maintain the precision of autofocus control,the speed of automatic focusing will slow down when using the Extender.When the lens taken from cold to warm places, the surface and internal condensation may occur. In order to prevent internal condensation may occur. In order to prevent condensation, when taking the lens from cold to warm places,

please first put the lens in sealed plastic bags, then take out after the lens warming up. And use the same method when taking out from the warm to cold places.

Major Specifications Mount:EF mount(Electronically controlled) Lens construction: 7 elements in 3 groups

Dimensions(max.dia. ×length): 72.0×32.5mm Weight:approx.200g

※All specifications are based on YONGNUO’s test and measurements.※Product specifications and appearance are subject to change without notice.

Shenzhen YONGNUO Photographic Equipment Co., Ltd Email: service@yongnuo.com Website:www.hkyongnuo.com

Lens Focal LengthMaximum Aperture Auto Focus

EF 135mm f/2L USM

EF 180mm f/3.5L Macro USM

189mm f/2.8 ○

EF 200mm f/2L IS USM

EF 200mm f/2.8L II USM

EF 300mm f/2.8L IS II USM

EF 300mm f/2.8L IS USM

EF 300mm f/4L IS USM

EF 400mm f/2.8L IS II USM

EF 400mm f/2.8L IS USMEF 400mm f/2.8L IS USM

EF 400mm f/4 DO IS II USM

EF 400mm f/4 DO IS USM

EF 400mm f/5.6L USM

EF 500mm f/4L IS II USM

EF 500mm f/4L IS USM

EF 600mm f/4L IS II USM

EF 600mm f/4L IS USMEF 600mm f/4L IS USM

EF 800mm f/5.6L IS USM

EF 70-200mm f/2.8L IS II USM

EF 70-200mm f/2.8L USM

EF 70-200mm f/4L IS USM

EF 70-200mm f/4L USM

EF 100-400mm f/4.5-5.6L IS USM

EF 100-400mm f/4.5-5.6L IS II USMEF 100-400mm f/4.5-5.6L IS II USM

EF 200-400mm f/4L IS USM EXTENDER 1.4X（Not use EF1.4X)

EF 200-400mm f/4L IS USM EXTENDER 1.4X（Use EF1.4X)

Notice:○ means “Auto Focus” is supported.△ means “Auto Focus” is supported when this product works with parts of camera models.× means “Auto Focus is not supported.*1 Auto focus movement range of about 0.8 meters to infinity.*2 “Auto Focus” is supported when this product works with EOS-1D X、EOS-1Ds Mark III、EOS-1Ds Mark II、EOS-1Ds、 EOS-1D Mark IV、EOS-1D Mark III、EOS-1D Mark II N、EOS-1D Mark II、EOS-1D、EOS-1V/HS、EOS 5D Mark III 、EOS 7D Mark II EOS-1D Mark IV、EOS-1D Mark III、EOS-1D Mark II N、EOS-1D Mark II、EOS-1D、EOS-1V/HS、EOS 5D Mark III 、EOS 7D Mark II and focuses with central focus point. When this product used with other EOS cameras, there is only Manual Focus supported.*3 When this product is used with EOS DSLR cameras with multiple AF points, there is only central focus supported.In addition: when adjust aperture by 1/2 or 1/3, the maximum aperture of parts of lens may be different.

Mounting and dismounting the Extender

Maximum Aperture with the Extender252mm

280mm

280mm

420mm

420mm

420mm

560mm560mm

560mm

560mm

560mm

560mm

700mm

700mm

840mm840mm

840mm

1120mm

98-280mm

98-280mm

98-280mm

98-280mm

140-560mm140-560mm

140-560mm

280-560mm

392-784mm

f/4.5

f/2.8

f/4.0

f/4.0

f/4.0

f/4.6

f/4.0f/4.0

f/4.0

f/5.6

f/5.6

f/8.0

f/5.6

f/5.6

f/5.6f/5.6

f/5.6

f/8.0

f/4.0

f/4.0

f/5.6

f/5.6

f/6.3-8.0f/6.3-8.0

f/6.3-8.0

f/5.6

f/8.0

○*1

○

○

○

○

○

○○

○

○

○

△*2

○

○

○○

○

△*2

○

○*3

○

○

△*2△*2

△*2

○

△*2