EXCERPT page containing first few paragraphs. 2021-10-21 00:23:43
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The early morning lighting in early July quickly becomes harsh at high altitude, but it does not impede the assessment of lens performance and symmetry of sharpness, which is the goal here.
This gently ascending slope was chosen for its uniformity of fine detail to reveal any sharpness or symmetry issues. By focusing to the distance, any asymmetries stand out among the nearly identical ground cover. Scenes like this are ideal for testing lens performance at infinity focus, far superior to a building wall or other planar surface, because one can distinguish performance vs symmetry vs field curvature.
Colonizing new heights
Bristlecone pines are taking hold at increasingly higher elevations, this one being quite high, just a bit lower in elevation than some of the more adventurous smaller and younger saplings found at nearly 11,800' elevation on appropriate south-facing slopes. This one is around 11,500' elevation and looks rather lonely, but other smaller ones are taking up the challenge nearby, also. As no older trees are quite this high in this area, one can conclude that tree line is moving up.
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