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The minimum focusing ability is very useful in certain disciplines such as ornithology (bird watching) and even entomology (insect observation) and others, it allows us to clearly focus on animals (birds, butterflies, dragonflies, amphibians and reptiles, etc. ) a short distance, watching them in detail. The so-called "focus to infinity" also should be checked. This

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In addition to power flow routes are divided by type of thresholds – obstacles that are overcome on the ship. Oversea Wikipedia gives six shades of obstacles: level 1 (easiest). Small obstacles. Must the minimum possible maneuvers. Level 2 (easy). There are small rocks, requiring for their passage of simple maneuvers. Level 3 (complex). Already

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