It ' s not looking like Dak or Frederick will get the upgrade <| sep |> This gave me a good laugh <| sep |> In a very specific way you might , but don ' t bother trying it . The only way the longer lens comes out better is if you crop the wider lens down to the same fov . Trust me , he is right but the way he always explains it doesn ' t give people the right idea . If you pretend that the field of view does not matter to you , you will get the most photons by making the product of the cube of the crop factor times the square of the aperture times the focal length as small as possible . That is why a 24 mm f 1 . 4 is a nice choice for landscape astro . The focal length is good for milky way shots and lots of light comes through so even an older camera can do ok . Just promise to buy a longer lens if you find that you are always cropping your images extensively such that you do not need the width . Crop sensors and cropping in post have the same effect except cropping in post also reduces pixel count . Either way you will reduce light by a cube or square of the crop factor depending on whether the tripod is fixed or tracks the stars .