Lightdow RF 420-800mm F8.3 Telephoto Zoom Lens – MF for Canon EOS R6 Mark II/R5 Mark II/R5/R3/R7/R8/R10/RP/R6/R50/R1/R5 C/R50 V/R100/R/Ra – Manual Focus Mirrorless Cameras Lens(RF Mount,Black)
Price: $67.99 - $54.39
(as of Feb 03, 2026 00:48:06 UTC – Details)
Product description
The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. 420-800mm telephoto lens for canon RF Merchant Video
How to use the manual lens of the RF mount:
The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. How to use the manual lens of the RF mount Merchant Video
Manual Lens Necessary for Manual Operation
Manual operation steps:1) Set “Release shutter w/o lens” to “Enable”;2) Adjust to M mode.
Support RF lens for Canon EOS R, Ra, RP, R3, R5, R5 C, R5 Mark II, R6, R6 Mark II, R7, R8, R10, R50, R100 and other RF mount mirrorless camera.Not support for Canon EOS M mount series and EF mount series models
Lightdow 420-800mm Telephoto Zoom Lens
Note: No auto focus. Full Manual Lens, no electronic communication with the camera body, and the settings, including the F-number, are adjusted manually using physical controls on the camera lens itself. Therefore, the camera usually cannot display the F-number (only F00 or F– is displayed).
420-800mm RF Lens
420-800mm Telephoto Lens
EF Mount
Lens Mount
RF Mount
420-800mm
Auto Focus
Manual Focus
62mm Filter Size
EF Mount
Lens Mount
EF Mount
420-800mm
Auto Focus
Manual Focus
62mm Filter Size
420-800mm RF Lens 
420-800mm EF Lens 
Why are my photos out of focus and very blurry?
Before taking a picture, turn the focus ring on the lens body to focus. If the image is still blurry,we recommend using a tripod, shutter release cable, and time-lapse function to stabilize the image.
Why I can not press the shutter after attaching the lens?
1. First, go to settings on your camera and set “Release shutter w/o lens” to “Enable”.
2. Adjust to M mode.
3. Rotate the lens focus ring to focus, and adjust the ISO and shutter speed. (Lens aperture varies with focal length)
What is the filter size for this 420-800mm telephoto lens?
The filter size is 62mm.
Why is the aperture value not displayed?
Note: No auto focus function. This is a fully manual lens with no electronic communication with the camera body, and the aperture varies with the focal length of the lens. Therefore, the
camera typically cannot display the F-number.
If the picture is too dark, it can be remedied by:
Reduce the shutter speed from 1/500 sec. to 1/100 sec. or slower, such as 1/50 sec.
Increase the ISO number from ISO 100 to ISO 200/400/800, etc.
Switching positions to allow more ambient light to enter the camera’s imaging sensor through the lens.
[Easy-to-Use Warm Tips] – ⚠Fully manual(Advantages: precise focus control, creative freedom, high adaptability, stability and durability, and learning value) lens has no electronic contacts for focusing. Switch the camera to full manual (M) mode immediately after installation, otherwise the “no lens” error may be triggered; ⚠If the error still occurs, you need to enable the “Release shutter without lens” option in the camera menu.
[Manual Focus Experience] – Tailored for photographers who pursue the ultimate, the 420-800mm F8.3 lens adopts a fully manual focus design, requiring photographers to carefully adjust parameters such as shutter speed, ISO and aperture before shooting.
[Telephoto Zoom Lens] – Features include precision manual focus with a large focus ring design and an internal focus mechanism, UMC technology to minimize aberrations and flare. The aperture automatically adjusts based on focal length (f/8.3 at 420mm, f/16 at 800mm), and it is compatible with 62mm filters and RF mounts.
[Wide Compatibility with Canon FR-mount] – Lightdow 420-800mm F8.3 Telephoto Zoom Lens is perfectly compatible with Canon EOS R/RP/Ra/R5/R6/R3/R5 C/R6 Mark II/R7/R8/R5 Mark II/R1/R10/R50/R100/R50 V Mirrorless Cameras, providing a versatile lens for a variety of shooting scenarios.Whether it is portrait or landscape, street photography, macro, Lightdow lens can handle it easily.
[Capture Capabilities] – 420-800mm manual focus telephoto lens excels at capturing detailed images of distant subjects, effectively bringing remote objects closer. It is ideal for photographing the moon, wildlife, birds, buildings, airplanes, landscapes, and more. The aperture range is F8.3-16, and it automatically adjusts with the focal length. Consequently, the camera cannot set the aperture value of the manual lens, resulting in the display of F00/F– on the camera.
