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.

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Telephoto Lens RF Lens for Canon, 420-800mm Manual Focus MF Zoom Lens for Canon EOS R, Ra, RP, R3, R5, R5 C, R6, R6 Mark II, R7, R8, R10, R50, R100 Mirrorless

Product ID: 701936838

Details

Brand
BENOISON
Camera Lens Description
Manual focus
Compatible Mountings
Canon RF
Focal Length Description
420-800mm
Lens Type
Telephoto

🎯420-800mm super telephoto zoom

🔩Durable RF mount, no adapter needed

⚙️Full manual focus precision

100813CFA

Duties & taxes included

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔭 Zoom into the extraordinary — capture what others only dream of!

BUILT TO LAST - Robust construction with premium materials ensures your lens withstands the rigors of adventurous shoots.
COMPACT POWER ZOOM - 1.9x zoom ratio in a sleek, lightweight design that fits your professional kit without weighing you down.
REACH BEYOND LIMITS - Massive 420-800mm focal length for capturing distant wildlife and moon shots with razor-sharp detail.
TRUE MANUAL MASTERY - Full manual focus control lets you craft every shot with precision—perfect for pros who demand creative control.
SEAMLESS RF COMPATIBILITY - Upgraded RF mount fits Canon mirrorless cameras directly—ditch adapters and shoot faster.

The BENOISON 420-800mm RF telephoto lens is a full manual focus zoom lens designed exclusively for Canon RF mount mirrorless cameras. Offering an impressive super telephoto range with a fixed aperture from f/8.3 to f/16, it delivers exceptional reach for wildlife, sports, and astrophotography enthusiasts. Its upgraded RF mount eliminates the need for adapters, ensuring seamless compatibility and durability. While lacking image stabilization and electronic contacts, this lens empowers professionals to take full creative control with precision manual focusing and robust build quality.

Specifications

ASIN	B0DQNRY2DR
Best Sellers Rank	#12 in SLR Camera Lenses
Brand	BENOISON
Built-In Media	Lens Cleaning Cloth, Telephoto Lens RF mount, User Manual
Camera Lens	Manual focus 420-800mm telephoto lens (RF mount)
Camera Lens Description	Manual focus 420-800mm telephoto lens (RF mount)
Color	Black
Compatible Camera Models	Canon EOS R10, Canon EOS R3, Canon EOS R5, Canon EOS R6, Canon EOS RP
Compatible Camera Mount	Canon RF
Compatible Devices	for Canon RF mount mirrorless cameras
Compatible Mountings	Canon RF
Customer Reviews	3.7 out of 5 stars 80 Reviews
Exposure Control Type	Manual
Focal Length Description	420-800mm
Focus Type	Manual Focus
Image stabilization	No image stabilization
Lens	Telephoto
Lens Design	Zoom
Lens Fixed Focal Length	42 centimeters
Lens Mount	Canon RF
Lens Type	Telephoto
Manufacturer	BENOISON
Manufacturer Part Number	420-B-RF
Maximum Aperture	8.3 f_stop
Maximum Focal Length	80 centimeters
Media Type	ProductImage
Minimum Aperture	16 f_stop
Minimum Focal Length	42 centimeters
Model Name	420-B
Number of Items	1
Photo Filter Size	6.2 centimeters
Real Angle Of View	5 degrees
Warranty Description	1 year
Water Resistance Level	Not Water Resistant
Zoom Ratio	1.9

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