For the last few months I've really taken to shooting close up's of flowers/plants. I have used either my 35mm f1.8 prime lens or my 18-55mm kit lens. These lenses are OK but I often end up cropping the picture post capture to really focus on the detail of the flower. I'm therefore thinking of purchasing a macro lens but not sure what to go for. I've looked at the Nikon 40mm f2.8, which has the following: picture angle 38 degrees 50'; closest focus 0.163m/0.53ft; max reproduction ration 1x.
Would anyone be able to explain the specifications highlighted in red a bit more, and also what a specific macro lens can offer that the current lenses above that I am using don't - I would like to not have to crop pictures post-capture but fill the frame with the close up of the flower detail.
Any advice would be welcome,