What's more, it works with Sony 1.4x and 2x teleconverters. The latter can extend the maximum reach up 1600mm, even if the reduced f/16 maximum aperture is impractical for most scenarios, besides ...

As you might expect, the depth of field is razor-thin, probably sub-millimeter. Additionally, with a 4X lens on a 35 mm sensor, the field of view is about 9 mm so you have to have a steady hand ...

plus it's slightly pricier while Canon's lens has a 4x optical zoom which can zoom out wider to 200mm. For people with a Sony camera, however, the new FE 400-800mm offers the longest reach ...