I ordered this lens for the 2017 solar eclipse and it did not disappoint. I have not and have not yet used the 2x extension. At 1300mm I was honestly stunned by the photos and video of sunspots, Bailey beads and solar flares. Simply fantastic photos! The product description doesn't include Sony mirrorless cameras like the a6000, but it worked great with the right T-ring adapter. When examining other possible lenses, it turned out that they have serious problems with focusing. This lens performed very well and for the price you couldn't beat it.
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