uncleflo
Registered since September 28th, 2017
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Tag selected: sigma.
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Tamron 18-400mm f3.5-6.3 Di II VC HLD Wide Angle Lens for Canon APS-C - Black for sale online | eBay
Saved by uncleflo on February 13th, 2022.
Tamron 18-400mm EF-S lens I've been disappointed by the performance of both Canon & Sigma small extreme telephoto zoom lenses, particularly sharpness at the long focal lenses. Then along comes this 18-400mm lens that is the exception to the rule. It autofocuses well even at 400m zoom (at F6.3) given reasonable contrast. Focus is quiet, the anti-vibration feature provides a useful damping of shake, and at F8 the images is less than about 1 pixel blurred even at this huge zoom. At wide angle there is a little exposure fall-off at the corners. Not exceptionally lightweight but perfectly well balanced with the EOS 7D - quite a heavy camera for an EF-S mount. This lens has transformed the usefulness of the 7D as a medium sized setup to for wildlife photography. Not not quite at the quality of an EOS 1D Mk IV + huge and heavy Sigma 50-500mm IS (NLA) but much easier carry and hold and a good choice for a long trek.
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Lenses Database - DxOMark
Saved by uncleflo on May 11th, 2021.
DXOMARK's comprehensive camera lens test result database allows you to browse and select lenses for comparison based on their characteristics, brand, price, lens type, lens size, focal range and aperture. You can also select a camera to see the results for all the lenses tested on it. With DXOMARK you can display the lenses with three different views - Grid, List or Graph in order for you to have the best solution to compare the filtered results. Choose the lenses you want to compare from the results below. Then in the selection box, you can check up to three lenses at a time to compare their measurements.
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Why are modern 50mm lenses so damned complicated?: Digital Photography Review
Saved by uncleflo on May 11th, 2021.
Back in the days when men were iron and ships were wood, there were some things you could rely on. One of those things was your wide-aperture prime lens was a relatively simple double-guass design. Pre-1900, lens designers had already created five of the six lens types that are the basis of what we use today. (The retrofocus lens didn't come around until the 1920s, and zoom lenses, for those who are curious, are basically modified Cooke triplets.) The double gauss has been THE predominant design for wide aperture primes since the late 1800s. Over the years, designers have added additional groups to bring in more light, correct aberrations, and generally make a better lens. But the double gauss part was there in the center of the lens diagram for wide-aperture prime lenses right up until modern times. Name a famous prime lens and it was probably a double gauss: Speed Panchro, Planar, Xenon, Summicron, Takumar, Ultron, and on and on.
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