Canon RF-S 3.9mm F3.5 STM DUAL FISHEYE Manual

Introduction

The Canon RF-S 3.9mm F3.5 STM DUAL FISHEYE is a VR image production lens for use with EOS R series cameras compatible with RF-S lenses.

• To get the most from your lens, we recommend using it under the following conditions.
  • Use Live View
  • Use a tripod
• Images can be captured with two lenses, left and right. These images can be converted to a VR image using a camera application that supports the captured images.
• "STM" stands for Stepping Motor.

This lens can be used with some cameras* in the EOS R series. If the camera does not support it, or the camera's firmware is not a compatible version, there may be issues with the camera operation.

* For supported cameras, please check the Canon website.

Nomenclature

Attaching and Detaching the Lens

Please refer to the camera's instructions for details.

• Set the camera's power switch to OFF when attaching or detaching the lens.
• Attach the lens cap before detaching the lens from the camera.
• After detaching the lens, place the lens with the rear end up and attach the dust cap to prevent the lens surface and contacts from getting scratched. Make sure the lens and dust cap mount indexes are aligned when attaching the dust cap.
• 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.

Attaching and Detaching the Lens Cap

This lens projects out past the front frame. To protect the lens, use the special lens cap when not taking photos.

Attaching the Lens Cap

Attach (2) while squeezing the levers (1) on the Detach (2) while squeezing the levers (1) on the inner sides of the cap. inner sides of the cap.

Detaching the Lens Cap

Detach (2) while squeezing the levers (1) on the inner sides of the cap.

• After detaching the lens cap, do not touch the lens surface or allow it to come into contact with its surroundings.

Focusing/Control ring

The focusing/control ring can be used as either a focusing ring or a control ring.

Switching between the focusing ring and control ring is performed on the camera. Please refer to the camera's instructions for details.

Use as a Focusing Ring

Set the focus mode (AF/MF) on the camera. To shoot in autofocus (AF) mode, set the camera's focus mode to [AF]. To use only manual focusing (MF), set the camera's focus mode to [MF], and focus by turning the focusing ring (focusing/control ring).

Use as a Control Ring

Set the control ring function using the camera's menu. The control ring can be assigned the functions that are commonly used with cameras, such as shutter speed and aperture settings. Please refer to the camera's instructions for details on how to use the control ring.

• The lens does not have a focus mode switch or a focusing/control selector switch.
• Delayed focus may occur if the focusing ring (focusing/control ring) is quickly turned.
• Adjust for any difference in focus between the left and right lenses. For details, see Checking/ Adjusting Left and Right Focus.
• This lens does not support Servo AF. Before movie recording, set the focus using One-Shot AF or manual focus.

• This lens focusing/control ring is electronic.
• It is possible to set cameras that support electronic fulltime manual focusing to manual focusing when the camera is in the operational mode. However, the camera settings need to be changed.
• When AF operation is set to One-Shot AF, manual focus is possible after autofocusing has been completed by continuing to press the shutter button halfway (electronic manual focus function). However, the camera settings need to be changed.
• During movie mode, the AF speed will be slower than in still image shooting mode.

Please refer to the camera's instructions for details.

Checking/adjusting left and right focus

Checking Left and Right Focus
When first mounting this lens on the camera, or when using it after being transported for an extended period, use the following steps to check the difference between left and right focus.

1. Display an enlarged image from the left lens, then either use the camera's autofocus (AF) or turn the focusing ring (focusing/control ring) to focus the lens.
   
2. Switch to an enlarged image from the right lens.
   

• If the focus in the enlarged image from the right lens is correct after switching, adjustment is not needed. Only adjust the focus, using the steps on the following page, if the focus is not correct.

• For information on how to display an enlarged image from the left lens and how to switch display of enlarged images between the left and right lenses, refer to the "Shooting and Recording/Focusing" section in the VR Recording Guide.

Adjusting left and right focus
Leaving the enlarged image from the right lens showing, adjust using the following steps.

Left-right focus difference adjustment mode switch

1. Slide the left-right focus difference adjustment mode switch to the ADJUST side.
2. Turn the focusing/control ring to adjust.
   

• Turning the focusing/control ring only adjusts the focus of the right lens.
• Adjustment is complete once the focus in the enlarged image from the right lens is correct.
• After adjustment, return the left-right focus difference adjustment mode switch back to its original position (the opposite side to ADJUST).

If the right lens focus goes notably out of range while correcting for focus differences in the left and right lenses, slide the left-right focus difference adjustment mode switch back and forth three times within 6 seconds, starting from the ADJUST side. This will reset the right lens position to its initial setting. After that, check and adjust the left and right focus again. When the left-right focus difference adjustment mode switch is set to the ADJUST side, the AF mode cannot be used. In addition, you cannot shoot still images and movies.

Filters (Sold separately)

This lens has a rear filter holder at the rear.

It can take screw-in filters (φ30.5mm) or sheet filters (gelatin filters).

When using screw-in filters:

1. Attach the filter (φ30.5mm) to the rear filter holder mounting thread.
   
2. Match up the rear filter holder index and the attachment position mark on the lens, and turn the rear filter holder clockwise until it reaches the stop position mark.
   

• Removal is the reverse of attaching.

• Only one filter may be used.
• Please note that some filters cannot be attached, depending on their thickness or shape. If you force the filter on, you could damage the lens or filter.

When using sheet filters (gelatin filters):
Download the filter template files, print them out, then lay the filter over the template and cut to match. Then insert the filter in the rear filter holder.

1. Cut the filter to match the filter template outline.

• Download the filter template file (PDF).
• Print the filter template out at full size (100%), and use it as the template to cut out the filter.
• Also print this page out at full size and use it as the template. The filter template file is the same as this figure.
  

• Only one filter with a thickness of 0.2 mm/0.008 in. or less may be used.
• When printing the template, make sure that the illustration size remains the same. Check that the printed-out size is the same as the measurements shown in the illustration.
• Cut along the middle of the lines printed on the filter template. Any deviation from the template line width can cause the following issues.

Note 1: Cutting inside the line can lead to the filter not being held securely in the rear filter holder and slipping out of place.

Note 2: Cutting outside the line can lead to the filter not fitting in the rear filter holder.

2. After attaching the filter to the rear filter holder, attach the filter cover to the rear filter holder mounting thread.
   
3. Match up the rear filter holder index and the attachment position mark on the lens, and turn the rear filter holder clockwise until it reaches the stop position mark.
   

• Removal is the reverse of attaching.

• Image ghosting may occur as a result of using a filter. Take care to avoid getting dirt or scratches on the filter.

Exposure

Photographing with AE (auto exposure) is possible at all focusing distances even with this lens attached.

• AE metering range is restricted to within the image circle in the left lens.
• As this lens is wide-angle, using flash photography on close-up subjects can cause very inaccurate AE exposure measurements. In that case, either use a separate light meter or check your images after capture.

Specifications

* This comes included with the lens, but can also be purchased separately.

• The lens length is measured from the lens mount surface to the front end of the lens. Add 24.2 mm/0.95 in. when including the lens cap and dust cap.
• The width, height, length and weight are for the lens itself only.
• Close-up Lens 250D/500D cannot be attached because there is no size that fits the lens.
• You cannot use extenders.
• All data listed is measured according to Canon standards.
• Product specifications and appearance are subject to change without notice.

Safety Precautions

Precautions to ensure that the camera is used safely. Read these precautions thoroughly. Make sure all details are observed in order to prevent risks and injury to the user and other people.

Be sure to follow the instructions carefully when using the lens.

General Precautions

Handling Precautions

• Do not leave the product in excessive heat such as in a car in direct sunlight. High temperatures can cause the product to malfunction.
• If the lens is taken from a cold environment into a warm one, condensation may develop on the lens surface and internal parts. To prevent condensation in this case, first put the lens into an airtight plastic bag before taking it from a cold to warm environment. Then take out the lens after it has warmed gradually. Do the same when taking the lens from a warm environment into a cold one.
• Please also read any lens related handling precautions listed in your camera's instruction manual.

Shooting Precautions

• Focus again after recovering from the auto power off status.
• To maintain the focus position in the shooting-ready status, set [Auto power off] to [Disable] on the camera.
• This lens has a short focal length, which means dirt or dust on the surface of the lens will show up easily. Use a commercially-available blower to remove dirt or dust from the lens surface or mount opening.
• This lens is comprised of two lenses, and both the left and right lenses are read by one sensor. Depending on the camera, the image of the left lens is displayed on right side of the monitor, and the image of the right lens is displayed on the left side of the monitor.

Please refer to the camera's instructions for details.