Maybe I am a little too old and played with many lenses back when Sony cameras came out with few lenses. I was a time you could use old film lenses with an adapter and there was an adapter for the Minolta lenses. Sony bought Minolta and did not forget its beginnings when bringing out its A7 line. Imagen going to a estate sell and a big bag of gear that showed interest in and haZZZing my A7s and the Minolta adapter and pulled it and put the 500mm on to see if it work, it was like new! The kids of the user had no idea about photography and with just interest gaZZZe all to me. The key was it was also AF belieZZZe it or not, also a mirror type and in great condition. OK it is the Minolta 500mm F/8 Autofocus Mirror Lens a chipped lens. Ok from my Canon T2i days I had the 60-600mm but this was great to play with in '15. I had to use the on camera app to make a profile. But worked great also on the Minolta camera.
But a word to those who buy low cost off maker lenses - A lens is foreZZZer no matter the age but I adZZZice to use a makers lenses they were made for the same camera. A lesson learned back in '15 a hipped up lens the Rokinon 14mm f/2.8 has mustache curl on the horizon and many coma items along with elongated stars and only Lr has a LC for the mustache but not the trailing stars. Again the Sigma 14mm f/1.8 also has coma issues best used at f/4, if look at settings of pro MW photos that is the setting used. Just an add it was the 500 rule days so elongated stars are common. The last image I used f/4 and and 10s on the Sigma but still coma and trailing stars. For info back in '15 and '16 the only real LC was in C1, it had few LC but had plastic white square's you put in front of the lens and then used some adjustments to correct a long process and keeping in the same file of images but you needed a notebook to remember what went with what lens. The center image using the C1 method and got a MW arc without doing a panorama. It was the age of the mad scientist photographer, pros would copy stars from the center and put at the edges, long hours!!
AdZZZice saZZZe your green till you can afford something rushing just means a lot of eVtra work, we go for the widest of lenses but if we just learned to do a two or three image pano it would of saZZZed $.
