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.

BENOISON Telephoto Lens for Canon RF

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BENOISON 420-800mm f8.3 Manual Telephoto Lens for Canon RF (RF Mount)

Compatible Models (for Canon R series):

  • for Canon EOS R, Ra, RP, R3, R5, R5 C, R6, R6 Mark II, R7, R8, R10, R50, R100 Mirrorless Camera (RF mount)
  • Not for Canon EOS M50, M100, M6, M5, M10, M3, M (EF-M mount)
  • Not for Canon EOS Rebel SL3 SL2 T8i T7 T6 T5 4000D 2000D 90D 77D 6D 5D 1D…… (EF/EF-S mount)

Use in M Mode

  • When using a manual lens, the camera should be set to "M" manual mode.
  • Since manual lenses lack electronic contacts for lens recognition, the inability to automatically adjust exposure values may result in photos that are too dark or too white.
  • Manual setting of ISO and shutter speed is required.

F00 Display

  • Manual lenses do not have an electronic contact, "F00" is displayed because the camera is unable to acquire aperture information.
  • At the same time, the aperture information cannot be adjusted from the camera, and the aperture value can only be changed automatically by adjusting the focal length.

How to use the manual lens?

Enable "Release shutter w/o Lens"


  • You can not press the shutter after attaching. To resolve this, Enable "Release shutter w/o Lens".
  • Tips to use our Manual Lens: 1) Set the Release shutter w/o Lens option in the camera menu to Enable. 2) Set the mode dial to Manual (M).
  • Note that the aperture value will not be displayed (it will show "F00"). The aperture can only be changed automatically by adjusting the focal length, for example: 420mm/F8.3 → 500mm/F10 → 600mm/F12 → 700mm/F14 → 800mm/F16.
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.

Enable "Release shutter w/o Lens"

Merchant Video

  • Why can't I press the shutter after mounting the lens?

    Please do Enable the "Release shutter w/o lens", and then you can press the shutter to take a picture.

  • Why does my picture out of focus and very blurry?

    Since our lenses are manual lenses, there are no electronic contacts for autofocus. Need to turn the focus ring (on the front of the lens) for manual focusing. If it is still blurry, use a tripod and time-lapse function to keep the image stable.

  • Why is F00 displayed and how can the aperture value be set?

    As the manual lens has no electronic contacts to recognize the aperture value, “F00” is displayed. The aperture value can only be adjusted automatically by changing the focal length. (420mm/F8.3 →500mm/F10→600mm/F12→700mm/F14→800mm/F16)

  • What if the image turn out bright?

    If the image is too bright, lower the ISO (e.g. from 200 to 100) to reduce the light sensitivity and increase the shutter speed (e.g. from 1/125s to 1/250s) to reduce the exposure and avoid overexposure.

  • What if the image turn out dark?

    If the image is too dark, increase the ISO (e.g. from 800 to 1600) to increase the sensitivity and decrease the shutter speed (e.g. from 1/250s to 1/125s) to allow more light onto the sensor.