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ENG-1

Nomenclature

 Lens release lever

 Mount index (EF Lens)

 Mount index (EF-S Lens)

 Front mount

 Front contacts

 Mount index (camera side)

 Rear mount

 Rear contacts

 Rubber ring

 CLEAR filter

 Variable ND filter

 Circular polarizing filter

 Lock release button

 Adjustment dial

 Solid white line

Thank you for purchasing a Canon product.

The Canon Drop-In Filter Mount Adapter EF-EOS R is designed to 

allow EF series lenses *

1

 to be used with EOS R series cameras.

It enables autofocusing, image stabilizers and other functions included 

in the lens attached to the camera to be used *

2

.

*1 Does not include RF lenses, EF-M lenses, or CN-E lenses (EF Cinema 

lenses).

*2 Certain restrictions may apply depending on the lens and camera in 

use.

 

Caution

Details pertaining to risks that may result in injury.

 

Do not leave the product in places exposed to extremely high 

or low temperatures. 

The product may cause burns or injury when 

touched.

 

Do not insert your hand or fingers into the product.

 This may result 

in injury.

Conventions used in this instruction

  Warning to prevent lens or camera malfunction or damage.

  Supplementary notes on using the adapter and taking pictures.

This device complies with Part 15 of the FCC Rules. Operation is subject to the 

following two conditions: (1) This device may not cause harmful interference, and (2) 

this device must accept any interference received, including interference that may 

cause undesired operation.

Do not make any changes or modifications to the equipment unless otherwise 

specified in the instructions. If such changes or modifications should be made, you 

could be required to stop operation of the equipment.

This equipment has been tested and found to comply with the limits for a class 

B digital device, pursuant to part 15 of the FCC Rules. These limits are designed 

to provide reasonable protection against harmful interference in a residential 

installation. This equipment generates, uses and can radiate radio frequency 

energy and, if not installed and used in accordance with the instructions, may cause 

harmful interference to radio communications.

However, there is no guarantee that interference will not occur in a particular 

installation. If this equipment does cause harmful interference to radio or television 

reception, which can be determined by turning the equipment off and on, the user 

is encouraged to try to correct the interference by one or more of the following 

measures:

•  Reorient or relocate the receiving antenna.

•   Increase the separation between the equipment and receiver.

•   Connect the equipment into an outlet on a circuit different from that to which the 

receiver is connected.

•   Consult the dealer or an experienced radio/TV technician for help.
CAN ICES-3 (B) / NMB-3 (B)

 

z

 When using a lens that is heavier than the camera, be sure to hold the lens.

 

z

When detaching the adapter, be sure to attach the front and rear cap to 

protect the contacts. Make sure the adapter and cap mount indices are 

aligned when attaching the caps.

 

z

 Contacts that are scratched, soiled, or have fingerprints on them may result 

in faulty connections or corrosion, which may lead to malfunctions. If the 

contacts get soiled, clean them with a soft cloth.

 

z

 Since a lens’ minimum focusing distance is lengthened when this adapter is 

attached, maximum magnification and field of view might change. 

 

z

 The rear mount on the adapter has been fitted with a rubber ring to improve 

dust-resistance and water-resistance performance. This rubber ring may 

cause friction marks to appear around the camera’s lens mount, although 

this will have no effect on usage.

 

z

Rubber rings can be replaced at Canon Service Center (chargeable). 

■ Attaching and Detaching the Adapter

Attaching Procedures

1. Turn the camera OFF.

2. Attach the lens to the adapter.

Align the mount index found on the lens with the same mark found 

on the adapter, and turn the lens clockwise until you hear a click.

(Fig. 

-A for EF lenses, Fig. 

-B for EF-S lenses)

3. Attach the adapter onto the camera while the lens is still 

attached to it.

Align the mount index found on the adapter with the same mark 

found on the camera, and turn the adapter clockwise until you hear a 

click. (Fig. 

)

Detaching Procedures

1. Turn the camera OFF.

2. Detach the adapter from the camera while the lens is still 

attached to it.

Turn the adapter counterclockwise while pressing the camera’s lens 

release button. Detach the adapter once it has stopped turning. 

(Fig. 

)

3. Detach the lens from the adapter.

Turn the lens counterclockwise while pushing the lens release lever 

found on the adapter. Detach the lens once it has stopped turning. 

(Fig. 

)

CT1-B080-A

Drop-In Filter Mount Adapter 

EF-EOS R 

Instructions

ENG

-A

-B

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