Sigma 70mm F/2.8 EX DG Macro Lens for Sony Digital SLR Cameras

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Product Feature
- Lens Construction: 10 Elements in 9 Groups Angle of View: 34.3 degrees Number of Diaphragm Blades: 9
Product Description
Equivalent field of view to 105mm macro lens when used on a digital SLR camera with an APS-C size image sensor. Ideal lens for portrait, close up and other macro photography. Extremely high quality optical lens for use for medical use such as Dentistry , Dermatology, etc. Special Low Dispersion (SLD) lens and two high refractive index SLD lenses provide excellent correction for all types of aberrations Super multi-layer lens coating reduces flare and ghosting Floating focus system provides extremely high optical performance from infinity to 1:1 MacroSigma 70mm F/2.8 EX DG Macro Lens for Sony Digital SLR Cameras Review
I've never been a big fan of Sigma Zoom lenses, but their prime lenses are top notch. I've been using the Sigma 105mm and 50mm macro primes on my Canon full frame bodies so I decided to pick this lens up for my Nikon D300 to give me a 105mm equiv lens for that system.In a nutshell, this lens is fantastic. It is very sharp corner-to-corner on my Nikon D300. It is sharp wide open at f/2.8 and stays sharp up until about f/11, where it starts to soften just a bit. Lens construction is very sturdy and typical of the top-end sigma primes. Autofocus speed is adequate but not as fast as the best Nikon lenses. It also makes a little more noise when focusing. Manual focusing is excellent with a very smooth and precise feel. I really like this lens and it may be one of the sharpest prime lenses on the market. I highly recommend it.
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