Can the experience of Gerdy only agree - I have a real 100 macro - my experience with the Marumi-Achromat for 10 years: the difference in the results is minimal for my needs. Those who enjoy unusual shots screwed in front of the achromatic still a close-up lens the results are amazing. Attempts to work only with close-up lenses, I gave up very quickly, the results were miserable, then even more with a retro adapter and a high-intensity fixed lens. Conclusion: Have done with the Marumi-Achromat much joy and very nice shots.