Reviews and Problems with Sigma APO 50-150mm F2.8 EX DC HSM
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Lens Test: Sigma APO 50-150mm f/2.8
15 May 2008
Excerpt: At first glance, the new Sigma 50-150mm f/2.8 EX DC ($680, street) appears to possess an unusual focal length range. But when you do the math, multiplying by a 35mm lens-conversion factor of 1.4X, it becomes a more familiar-sounding 70-210mm equivalent.
Excerpt: For APS-C shooters who covet the fast, image-stabilized 70–210mm zooms for full-framers, Sigma provides the sole choice. This 50–150mm f/2.8 OS lens ($1,099, street) replaces a similar but nonstabilized lens in Sigma’s catalog.
Conclusion: A solid build quality that we have become accustomed to from the Sigma range and still light enough for handheld, OS remains sharp with a fixed range, wide aperture usually reserved for pros.
Pros: Fixed f/2.8 aperture, Four stops OS, Pro focal range, Lightweight for a telephoto
Cons: Too large for most hobbyists, Only for crop sensor, Vignetting
Excerpt: This new f/2.8 telephoto zoom from Sigma is the answer to many photographers' prayers. As lenses go, this one is rather short on what you could class as key features, but that doesn't mean that it's below par. In fact it sets the benchmark on what a telephoto zoom should offer.
Conclusion: So which lens you should choose? Sigma 70-200 f/2.8 or Sigma 50-150 f/2.8? First one has better optical performance, especially on APS-C/DX matrix. Astigmatism, vignetting and distortion are well controlled which is not in case of 50-150 model. But all in all advantage of 70-200 is not that big.
Cons: poor image quality at the edge for 150 mm,, chromatic abberation should be smaller in APO lens,, noticable astigmatism for focal length range from 100 to 150 mm,, clear vignetting especially at 150 mm,, significant front-focus with Canon 20D.
Sigma AF 50-150mm f/2.8 EX DC HSM (Nikon mount) - Review / Test Report
10 November 2006
Conclusion: The Sigma is an impressive lens with only few weaknesses. The resolution is excellent at 50mm and 100mm and (roughly) very good at 150mm although the quality could be a little better at f/2.8 here. While not formally tested the close focus performance (@ 150mm <1.5m) seems to fairly poor.
Summary: With a compact size and weight alleviating the need for a tripod collar and the third generation of Sigma’s HSM focussing motor making the AF very quick, the lens is fast in every sense and easy to handle.
Pros: Excellent optical performance, Very good handling with fast AF, Compact with a supplied hood.
Cons: Slight fall-off in resolution at the longest focal length., Distortion just noticeable at 150mm.
Excerpt: 1. Opis Sigma APO 50-150 mm F2.8 EX DC HSM spada v Sigmin EX pro razred objektivov. Oznaka DC nam pove, da je namenjena izključno fotoaparatom s senzorjem APS - C velikosti, HSM pa, da ima vgrajen ultrasonični AF motorček.
Pros: Ostrina pri vrednostih zaslonke od f4 do f8, Tiho in hitro ostrenje, Zgradba ohišja, Cena, Zelo dobra dopolnitev širokokotnega objektiva (ki je ponavadi v rangu 17/18-50/55mm)
Cons: V določenih primerih izrazita kromatska aberacija, Ostrina pri zaslonki F2.8