This image is in fact from my Rikenon 28mm lens near its min focus of 11 inches and shot at f/5.6.
Yes it's heavily cropped - but I cannot find any great fault with that as I'm not about to print a poster of this. Remember when you hear complaints about how 50mm and 35mm macro lenses make you frighten away bugs: cropping can be a good friend. I went inside and grabbed my Sigma 50 macro, but really could not get much closer in any case. I could crop it a bit less to get slightly better results, but the great shot with the 28mm is a better story to share. Macro-like images from a $35 lens and no screw-on 'macro filter' works for me!