uncleflo
Registered since September 28th, 2017
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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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How to Test Your Lens | B&H Explora
Saved by uncleflo on January 6th, 2019.
So, you just bought a shiny, new, and maybe expensive, lens for your camera, and being the savvy consumer, you did your homework. You pored over customer reviews on the B&H Photo website, read online reviews splattered all over the Internet, grabbed a copy of every photo magazine that reviewed the lens, bookmarked dozens of websites, and now have the lens’s MTF curve charts burned into your retinas. Now, your lens is here and it is time to go out shooting. Honestly, not a problem. Your lens should be as good as it can be and, as photographers, we want to take photos. So, stop reading and go out and make some photographs! Still here? OK, let me tell you why you might want to test that lens yourself. The main reason is that even with today's precision computer-controlled manufacturing techniques, there are variations in each and every lens that rolls off an assembly line. This means that some examples will be better than others. Some lenses will be outstanding and others will make you wonder if all of those glowing reviews you read online were completely bogus.
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Lens Tests: A Simple Method
Saved by uncleflo on January 6th, 2019.
This is a simplified subjective method of testing lenses optical sharpness. This should not be confused with tests for focus accuracy and discrimination in a 3D environment, that is a totally different issue although often confused by the inexperienced. A focus accuracy test is suggested here Focus Test. The advantage over this method, compared to just taking a shot of a garden etc, is elimination of variables such as subject and camera movement, insufficient depth of field, flatness of field and variations in focus location. It uses a nice consistent high contrast subject to make comparisons easy; checking sharpness on general photographic views is not very easy. As the method is subjective, it is worth testing against a known good lens for comparison.
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