Most wildlife photo/video makers desire "long enough" lens (what usually means +1000/1500mm or so) that would allow them to film critters from miles away. But such a "long enough" lens does not exist, and focal length of about 200-400mm is far enough in 99% of cases. Especially with GH cameras and its ExTC mode. Why? Because if you think you may get stunning picture you dream about, using +1000mm lens - you are wrong. Totally wrong! The amount of haze - an air (mostly hot, often moving also) between you and the creature you are filming - will be so high in that case, that it will destroy an overall image quality. The sharpness, clarity, colors, contrast etc. are lost! Therefore you need to get closer not using a longer tele lens, but just getting/moving YOU closer to the subject, to eliminate that haze effect. That's it.
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