I don't think this forum should be without a link to this cheap trick https://petapixel.com/2012/11/03/tu...o-a-macro-lens-by-removing-the-front-element/
I tried that a long time ago, it works and produces quite sharp results but the big disadvantage is that the lens ends up with only one distance at which you can use it because by removing the front element it also removes the ability to focus.
