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Syousef,
IF stands for individual focusing as opposed to CF centre focusing. Each eyepiece has its own dioptre adjust, with no focus wheel. Its the only way to go for proper "marine" binoculars that are fully waterproof. Coming from this background, I have found that this type is also the best for astronomy, having viewed the dark skies at sea for many years.
Your slide show is very well done and should be informative and enjoyable. Congratulations!
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