EXCERPT page containing first few paragraphs. 2021-12-04 02:53:17
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The goal here is to assess control of secondary longitudinal chromatic aberration which tends to show up on out of focus high contrast areas or other transitional contrast areas.
The lens was on a tripod, and focused at 300mm. Shutter speeds ranged from 1/13 second at f/2.8 to 1.0 seconds at f/11. While watching in 10X Live View for any movement, a remote release was used in Mode 2 (zero vibration).
To avoid blur from motion, extreme caution is advised when shooting with long telephoto lenses. Like nearly all super teles (Canon, Nikon too), the tripod foot is poorly designed for stability, producing visible jiggling at the slightest provocation (a puff of wind). This is easily seen by entering magnified Live View. The weight and sturdiness of the tripod are only a minor factor by comparison. Long lens looking for stability use more elaborate support mechanisms.
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