If on a walk between fields, you can spot these many times. Old bathtubs,that are being used as drinkingwells for cattle. These were just waiting to get used, the animals were not out yet after the winter and the fields were being prepared. If I find one with water in, I ask my wife to go sit in the tub and take a bath in nature. No luck so far, and she makes it clear what I can do with the idea. But one day………. Lens of choice was a Carl Zeiss Pancolar 50mm f1.8, if you want to go for a vintage CZ lens, I prefer this one over the famous Tessar.