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Message: <blockquote data-quote="J-see" data-source="post: 475444" data-attributes="member: 31330">As mentioned the cheapest option is the Tamron or Sigma 150-600mm. They'll both lose some sharpness at the longest end but up to 400mm they're pretty decent.For primes it gets expensive pretty fast. You'll need at least 300mm which is already a bit short for birding.There's the older and new Nikon 300mm f/4 which cost around 1.5k and 2k and after that the price only goes up (a lot). You can combine them with teleconverters but they do impact image quality. The more they increase focal length, the more the impact on image quality.</blockquote>