Complex sentence: The Sony FE 70-200mm F2.8 GM OSS lens is one of Sony's two lenses that are compatible with their dedicated 1.4x and 2.0x lens teleconvertors, yielding an effective focal length of 98-280mm and 140-400mm, respectively.
Split into simpler sentences: The Sony FE 70-200mm F2.8 GM OSS lens is currently one of only two Sony lenses that are compatible with their dedicated 1.4x and 2.0x lens teleconvertors. When equipped, the combination yields an effective focal length of 98-280mm and 140-400mm, respectively.