Imaging recource: LensRentals’ 400mm shootout: Money usually buys better results, but there’s more to it than price

    LensRentals does a lot of excellent testing, but to date they have been unable to adequately test lenses that weigh more than 2.5 kilograms (about five and a half pounds) and have a focal length greater than 250mm, so supertelephoto lenses have not been tested. However, with a lot of determination and some tweaking to their testing methods, the team has been able to evaluate 400mm lenses with "good reproducibility" and perform "The (sort of) Great 400mm Lens Shootout." You'll notice a few lenses are missing, such as the Nikon...
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