Note : This is a 420-800mm lens, add extra 2X teleconverter lens become 1600mm Version installed way as following If you have any questions, please contact us by email, we will reply you within 24 hours Important USE TIP ThisisaFULLManualLens,NOElectronicContacts,yourcamerawillnotdetectthelenswhenmounted,that'swhyitshows"LENSNOTATTACHED"orerror,pleaseswitchtoMFMODEinordertousethislenscorrectly.TipstouseourManualLens:1)SetthemodedialtoManual(M).2)SettheReleasew/oLensoptioninthecameramenutoEnable.3)SettheShutterlockoptioninthecameramenutoOff:nolens4)Setyourcamerato1/1000thofasecondandtheISOto1000.Setthelenstof8.Gooutsideonasunnydayandtryagain,thenusewithatripodtomakeimagestablewithoutblurry.manualmodeisjustthat:manual.Youhavetoadjustyoursettingstogettheexposure.Camerawillnotdoitautomatically.Noimage("black")meansnotenoughlight,ifit'sblownout("white"),thereistoomuch.Adjustyourshutterspeedaccordingly.youcanadjustslowlyshutterspeed(-ifonblack)oradjustthefastershutterspeed(ifonwhite)pleasefollowingforourusetiptousethislensagain. About JINTU We are a professional photography equipment company, start on 2013, USA, Specialize production for camera lens, lens adapter etc in china. Feature: JINTU 420-800mm Manual focus Super Telephoto lens, 2X Teleconverter doubles the power of your lens to 1600mmwith strong full metal body, Small size 10.6 x 3.5 x 3.5 inch, light weight 700g=1.8LB, easy to carry to anywhere. Ultra high definition image quality .with Japan design,High index, low-dispersion multi-coated optical glass to reduce flare Perfect for the wildlife or nature photographer who wants to be hidden while taking photos of the subject. Work with anyCanon Digital EOS Rebel T1i, T2i, T3, T3i, T4i, T5, T5i, T6, T7, T6i, T6s, T7i, SL1, SL2, EOS60D, 70D, 77D, 80D, 50D, 40D, 30D, EOS 5D, EOS1D, EOS5D III, EOS 5D IV, EOS 5Ds, EOS 6D, EOS 7D, EOS 7D Mark II Digital SLR CamerasIncludes T-mount adapter for digital and 35mm canon SLR cameras :Introduction:For photographers seeking the ultimate super-telephoto zoom lens, the JINTU 420-800mm HD II delivers unrivaled consistency, long range performance and image quality in the most demanding situations. An advanced lens that draws peak performance from D-SLRs, it's an ideal choice for photographers who want to keep their gear cost to a minimum while on super-telephoto assignments.The JINTU 420-800mm high definition super telephoto zoom lens is perfect for the professional and amateur photographer alike. There is a built-in, rotating tripod mount for easily attaching to your tripod or monopod. For 2X teleconverter lens:The 2x Professional Multiplier is a high-quality teleconverter that delivers enhanced telephoto versatility.It multiplies the focal length by 2x, providing an affordable and portable way to extend your cameras reach.This lens can fit 500mm 800mm 420-800mm & 650-1300mm etc telephoto LENSSpecifications:Zoom Type: Push/Pull (Two-touch)Focus Mode: Manual FocusMinimum Focus Distance: 5.25' (1.6 m)Aperture: f/8.3-16Filter Size: 62mmLength: 8.75" (11.85" at full zoom)Weight: 18.3 oz (520 g)Camera Mount: For canonPackage includes:1 X Jintu 420-800mm Lens1X T2 Mount Adapter1x Front Lens cap1x Rear Lens cap1 x 2x