The disadvantage of the old frog 60 macro is that the sealing is not enough and the focusing system is backward. Old frog's 60 macro seal is not good, and the performance of this 60mm F2.8macro2: 1 macro lens is not good, especially in terms of resolution. The resolution is very low at the aperture from F2.8 to F8, and the sharpness of this lens only reaches a usable level from F 1 1. Although small aperture is usually used when shooting macro, the imaging quality of this lens is extreme and the focusing system is backward, which belongs to design defects.