uncleflo
Registered since September 28th, 2017
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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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Canon EF 28-300mm f/3.5-5.6L IS USM Lens
Saved by uncleflo on July 23rd, 2016.
The EF 28-300mm f/3.5-5.6L IS USM Lens from Canon is an all-in-one zoom lens for versatile and easy subject selection for multiple photographic applications. This lens offers the highest optical performance in its class, plus the convenience of focusing as close as 2.3 feet over the entire zooming range.
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