420-800mm F8. 3-16 Telephoto Zoom Lens(Mf) + T-Mount for Canon & for Nikon & for Sony Mount, Very Suitable for Outdoor Shooting, Moon Photography

Q:If the picture is too dark, it can be remedied by:A: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.

Q:Why I can not press the shutter after attaching the lens?A:Fully manual(Advantages: precise focus control, creative freedom, high adaptability, stability and durability, and learning value) lens has no electronic contacts for focusing. For 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.

Q:Why are my photos out of focus and very blurry?A: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.

Q:Why is the aperture value not displayed?A: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,thecamera typically cannot display the F-number

Manual focus lens,

To address a photo that is overly dark, you can take the following steps: 1) lower the shutter speed from 1/500 second to 1/100 second or even slower, like 1/50 second, 2) raise the ISO setting from ISO 100 to ISO 200/400/800, and so on, 3) adjust the angle to allow more surrounding light to reach the camera's sensor via the lens.

For EF Mount Series：for EOS Rebel T8i/T7i/T7/T6s/T6i/T6/T5i/T5/T4i/T3i/T3/T2i/T1i/XSi/XS/SL3/SL2/SL1(100D) & Digital Rebel/XTi/XT/T100(4000D) & EOS 90D/80D/77D/70D/60D/50D/40D/30D/20D/10D/7D Mark II/7D/6D Mark II/6D/5DS R/5DS/5D Mark IV/5D Mark III/5D Mark II/5D & EOS-1D X Mark III/1D X Mark II/1D X/1Ds Mark III/1Ds Mark II/1Ds/1D Mark IV/1D Mark III/1D Mark II/Mark II N/1D.

For RF Mount Series：For 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

For F Mount Series：For D-series DSLR cameras: D850 D810 D810A D800 D800E D780 D750 D700 D610 D600 D500 D300 D300S D200 | D7500 D7200 D7100 D7000 D5600 D5500 D5300 D5200 D5100 D5000 D3500 D3400 D3300 D3200 D3100 D3000 | D100 D90 D80 D70 D70S D60 D50 D40X D40 | D6 D5 D4S D4 D3S D3X D3 D2XS D2X D2H D1X D1H D1;

For E Mount Series：For a7 IV/a7 III/ZV-E10/a7R V/a7C II/a6700/a7R IV/a7S III/a1/a7C/a6600/a9 III/a6400/a7R III/a6100/a7S II/ZV-E1/a9 II/a7 II/a7R II/a5100/a7S/a6000/a9/a7R/NEX-7/NEX-6/NEX-5/Alpha

Fully manual(Advantages: precise focus control, creative freedom, high adaptability, stability and durability, and learning value) lens has no electronic contacts for focusing. For 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

The 420-800mm f/8.3-16 full-frame zoom lens is designed specifically for professional photographers. It includes an adapter ring at no additional cost. Features include precision manual focus with a large focus ring design and an internal focus mechanism, UMC technology to minimize aberrations and flare, resulting in sharp images with exceptional background bokeh. The aperture automatically adjusts based on focal length

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.