Hello, I have just started with macro(micro) photography. I have F-801s body with AF 35/2 and AF 85/1.8 lenses. I would like to hear some comments about PK13 and PK12 extension rings. What is quality of pictures taken with these rings, especially compared with 60/2.8 micro or 105/2.8 micro. I am planning to use these rings mostly with 85/1.8 lens. Is it better to use supplementary lenses NR 5T or NR 6T with 85/1.8 or is better with PK12 respective PK13. Thanks Samir
