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What is the “blend” in context of a super telephoto lens?
What is the "blend" in context of a super telephoto lens? I need the definition of a "blend." I'm looking at a big full frame telephoto lens, the really big ones that have their own tripod mount on them. Although the seller is saying there is an issue with the "blend" and "blend screw". From context clues I'm guessing this is something to do with the len's built in tripod mount but googleing is not he...
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