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Sigma Sony Fit 17-50mm F2.8 EX DC OS HSM Auto Focus Wide Lens The Sigma 1750 mm f/2.8 EX DC OS HSM belongs to the high-end series, marked by the EX symbol. It starts with a metal mount inside which you see the rear element with a diameter of 27 mm. It is placed at the level of the mount for the 17 mm focal length and it collapses over two centimetres inside when you pass to the focal length of 50 mm. This lens covers a focal length from 17mm wide angle and offers a large aperture of F2.8 throughout the entire zoom range, making it ideal for many types of photography such as portraiture and landscapes. The OS (Optical Stabilizer) function offers the use of shutter speeds approximately 4 stops slower than would otherwise be possible. According to the producer the new Sigma 1750 mm f/2.8 OS is equipped with the newest optical stabilization mechanism (OS), which is supposed to work with 4 EV efficiency. Such efficiency level is declared for all Sigma lenses with stabilization. It uses two elements made from Sigma's new 'FLD glass', plus two glass mold and one hybrid aspherical elements, to reduce aberrations. The minimum focus distance is 28cm across the entire zoom range, giving a maximum magnification of 0.2x, and the 77mm filter thread does not rotate on focusing. The Sigma 1750 mm f/2.8 has some issues with the work against bright light but fortunately they are not huge. You can catch light artifacts the easiest at the shortest focal length and their intensity increases after the stopping down of the lens. At 30 mm the flares are small and at the maximum focal length they become negligible. High image quality is assured throughout the entire zoom range. Incorporating HSM (Hyper Sonic Motor), the lens provides fast and quiet AF. The lens has a minimum focusing distance of 28cm (11) throughout the entire zoom range and a maximum magnification ratio of 1:5. The rounded 7 blade diaphragm creates an attractive blur to the out of focus images. The inner focusing system eliminates front lens rotation, making the lens particularly suitable for use with the supplied petal-type lens hood and circular polarizing filters. The 17-50mm f/2.8 EX DC HSM OS features the slightly simplified version of Sigma's HSM (hypersonic AF motor). It is still fast and nearly silent but full-time manual (FTM) override is not possible in one-shot AF mode. The AF speed via in contrast AF (Live-View) is on the slow side. Manual focusing is delicate due to the very short focus path - it just takes a turn of 30 degrees to focus from infinity to the close focus limit. This approach improves the AF speed for sure but you need to have some experts skills if you want to do it all manual. The focus accuracy of the tested sample was fine on our test DSLR. Kit Content Sigma (Sony Fit) HSM 17-50mm F2.8 EX DC OS Auto Focus Wide Lens Case Petal-type Hood (LH825-03) For more information about, Sigma 17-50mm F2.8 EX DC OS HSM AF Wide Lens For Sony . Customer Reviews on Sigma 17-50mm F2.8 EX DC OS HSM AF Wide Lens For Sony by Sigma£522.00 by Sigma£279.00 by Sigma£193.02 by Sigma£312.00
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većina fotografskih entuzijasta koristite zoom objektive , a ne fiksne žarišne duljine . Sigma proizvodi široku lepezu zoom objektivima , uključujući i 8-16 mm f/4.5-5.6 DC HSM , u 17 do 50 mm f/2.8 EX DC OS HSM , u 17-70 mm f/2.8-4.0 DC Macro OS HSM ,50-200 mm f/4.0-5.6 DC OS HSM , 18-50 mm f/2.8-4.5 DC OS HSM . Dodatni zoom su žarišne duljine 18-50 mm , 18-125 mm , 18-200 mm , 18-250 mm i 10-20 mm . DC fiksne žarišne duljine fiksne duljine fokusa obično se koristi rad stručnjaka koji zahtijevaju veću kvalitetu slike i razlučivost od onoga što se nalazi u zoom objektivima . Fiksne žarišne duljine često nazivaju premijera leće , iako je premijera leće zapravo predstavljaju normalne žarišne duljine objektiva za određeni filmski format . Za APS - C formata kamere , Sigma čini tri modela - .4,5 mm f/2.8 EX DC HSM Kružna Fisheye , na 10 mm f/2.8 EX DC HSM Fisheye i 30 mm f/1.4 EX DC HSM DC objektiva Kompatibilnost Sigma DC objektivi kompatibilni s većinom DSLR fotoaparata . Nisu svi objektivi su u potpunosti kompatibilan sa svakim kamere napraviti i model . DC objektivi kompatibilni su sa Sigma , Canon, Nikon, Konica Minolta /, Sony, Pentax , Kodak, Fujifilm , Olympus i Panasonic i Leica kamerama . DC objektivi nisu kompatibilni sa 35 mm filmskoj ili full - frame DSLR fotoaparata . DC vs DG objektivi Iako su obje linije leće su u skladu s digitalnim fotoaparatima , DG objektiv linija nudi velik otvor , širokokutne leće s kratkim naglaskom minimalna udaljenosti . Za razliku od DC objektiva , DG objektivi su također kompatibilan sa full frame DSLR fotoaparata i 35 mm filmske kamere . APS - C vs Full Frame APS - C senzor , koristi na mnogim DSLR fotoaparata , su kompaktni ili ne- full frame senzor . Full frame senzor mjeri iste veličine kao full frame 35 mm filma , odnosno 36 mm i 24 mm. Kompaktni ili APS - C veličini senzora su manji od punog kadra od 35 mm filma . Kad koristite fotoaparat s kompaktnim senzorom ,žarišne duljine objektiva dobiva množi s nečim što se zovefaktor usjeva . Na primjer , kada se koristi Sigma 30 mm f/1.4 EX DC HSM objektiv na fotoaparat sa APS-C senzor koji ima faktor 1,6 x obrezivanje ,30 mm žarišne duljine ima jednaku vidno polje od 48 mm objektivom na standardni full frame fotoaparata . From:http://hr.365electric.com/cameras/camera-lenses/1016053868.html