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Sigma 18-35 f1.8
Some sample images he
http://lcap.tistory.com/entry/Sigma-...mm-f18-Preview An interesting lens for Dx users, and the samples look pretty good. (OK - in my opinion, they look better than pretty good - they look great). So this lens has four "glass-mould" aspherical elements. This is also interesting, as even Nikon only seems to use "PGM" aspherical elements in very high-end lenses, possibly explaining the exceptional performance of the UWA 14-24 zoom. The aspheric elements, including the front element, even on many "pro quality" (including some Canon L designation lenses) wide lenses have been "hybrid" - glass laminated to plastic. A harsh critic of Sigma recently has this to say about the Sigma 35mm f1.4: http://www.lensrentals.com/blog/2012...ew-world-order Tests at DXO show similar results for this lens. Comments posted on Roger Cicala's blog indicate that users are having problems with AF consistency on various bodies. A brief scan of forums shows that many users are having AF consistency problems with fast lenses of many different types and brands, so not sure if this reported problem with the 35mm f1.4 is just another indication of the perils of PDAF systems, high pixel counts, and aggressive pixel-peeping. It will be interesting to see if adjustment using Sigma's USB dock can overcome these focus issues if they are real. I suspect with fast lenses on high MP bodies, that it's not going to be a simple DIY job to calibrate AF when users have two systems to work on - the camera's AF fine-tune as well as the lens calibration system itself. Meanwhile, Sigma has issues with some "OS" lenses on some Nikon bodies, but these are issues "unrelated to AF or lens performance", but weird issues where an image being reviewed on the LCD screen on the camera can't be "scrolled" when the OS system is turned on in the lens. There's no price for the 18-35mm f1.8 yet. Sigma USA's "MSRP" when they list new lenses is usually well above "street price" by the time stock hits the stores. |
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Sigma 18-35 f1.8
I only have one Sigma lens, their 20 f/1.8 and it's excellent. It's
not stunningly sharp wide-open but who expects that any ultra-wide ultra-fast prime could be? It was only moderately expensive, it works, and it is great when stopped down. The only problem I see with this particular zoom is that it looks to be as large as three large-aperture primes stacked on top each other. On 2013-04-20 00:24:36 +0000, Me said: Some sample images he http://lcap.tistory.com/entry/Sigma-...mm-f18-Preview An interesting lens for Dx users, and the samples look pretty good. (OK - in my opinion, they look better than pretty good - they look great). So this lens has four "glass-mould" aspherical elements. This is also interesting, as even Nikon only seems to use "PGM" aspherical elements in very high-end lenses, possibly explaining the exceptional performance of the UWA 14-24 zoom. The aspheric elements, including the front element, even on many "pro quality" (including some Canon L designation lenses) wide lenses have been "hybrid" - glass laminated to plastic. A harsh critic of Sigma recently has this to say about the Sigma 35mm f1.4: http://www.lensrentals.com/blog/2012...ew-world-order Tests at DXO show similar results for this lens. Comments posted on Roger Cicala's blog indicate that users are having problems with AF consistency on various bodies. A brief scan of forums shows that many users are having AF consistency problems with fast lenses of many different types and brands, so not sure if this reported problem with the 35mm f1.4 is just another indication of the perils of PDAF systems, high pixel counts, and aggressive pixel-peeping. It will be interesting to see if adjustment using Sigma's USB dock can overcome these focus issues if they are real. I suspect with fast lenses on high MP bodies, that it's not going to be a simple DIY job to calibrate AF when users have two systems to work on - the camera's AF fine-tune as well as the lens calibration system itself. Meanwhile, Sigma has issues with some "OS" lenses on some Nikon bodies, but these are issues "unrelated to AF or lens performance", but weird issues where an image being reviewed on the LCD screen on the camera can't be "scrolled" when the OS system is turned on in the lens. There's no price for the 18-35mm f1.8 yet. Sigma USA's "MSRP" when they list new lenses is usually well above "street price" by the time stock hits the stores. |
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