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

$191.46

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Sold byAmazon USADelivered 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 adventurous shoots season after season.
CREATIVE CONTROL - Fixed aperture from f/8.3 to f/16 offers consistent depth of field for stunning telephoto compositions.
REACH BEYOND LIMITS - Massive 420-800mm focal range captures distant wildlife and moon shots with unmatched detail.
SEAMLESS COMPATIBILITY - Upgraded RF mount fits Canon EOS R series mirrorless cameras directly—ditch the adapter hassle.
PRECISION IN YOUR HANDS - Full manual focus ring lets you fine-tune every shot for razor-sharp clarity—no autofocus distractions.

The BENOISON 420-800mm RF telephoto lens is a manual focus zoom lens designed exclusively for Canon EOS R series mirrorless cameras. Featuring a super-telephoto focal length range, durable RF mount construction, and a fixed aperture from f/8.3 to f/16, it offers photographers precise control and exceptional reach for wildlife, moon, and distant subject photography. This lens requires manual focusing and camera settings adjustment but delivers professional-grade telephoto performance without the need for adapters.

Specifications

ASIN	B0DQNRY2DR
Best Sellers Rank	#39 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)
Color	Black
Compatible Camera Mount	Canon RF
Compatible Devices	for Canon RF mount mirrorless cameras
Customer Reviews	3.7 3.7 out of 5 stars (68)
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	420 Millimeters
Lens Mount	Canon RF
Manufacturer	BENOISON
Manufacturer Part Number	420-B-RF
Maximum Aperture	8.3 f
Maximum Focal Length	800 Millimeters
Media Type	ProductImage
Minimum Aperture	16 f
Minimum Focal Length	420 Millimeters
Model Name	420-B
Photo Filter Size	62 Millimeters
Real Angle Of View	5 Degrees
Warranty Description	1 year
Water Resistance Level	Not Water Resistant
Zoom Ratio	1.9

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$191.46

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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