The Holding Tank

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MTF Study

| Lens MTF Area Summary and Figure of Merit |

| MTF Data Overview | Photodo / Canon MTF Cross Validation | 

| Contax, Nikkor and Leica R lenses vs Canon | 

| List of Canon Data Comparisons | List of Photodo Data Comparisons |

| Database Download |

85mm Region

| Average MTF | Worst Case MTF | Relative MTF | S to M Ratio |

 | Figure of Merit  | MTF Area Average | Conclusions |

Conclusion

f8

Again, both prime lenses generally superior.  

The zooms do well reflecting the easing of the lens design constraints at the longer focal length, however, the primes are 100% satisfactory over the whole image, and in the case of the primes superior overall for contrast and most of the frame for detail.

The 24-70mm and 70-200mm f/4L (and IS version) can almost provide superior performance over the whole 1.6X crop factor frame.  

Max Ap

The 100mm f2.8 macro and the 70-200mm zoom have very similar contrast performance with the 100mm only slightly better. The 85mm is also as good as these out as far as 17mm offset from the optical axis. This is very impressive for the faster 85mm lens.

Maximum aperture detail performance is very close between the lenses, again this is impressive for the faster 85mm.

The Bokeh again is very comparable with the faster 85mm only loosing out beyond 16mm offset from the optical axis.  

MTF Study

| Lens MTF Area Summary and Figure of Merit |

| MTF Data Overview | Photodo / Canon MTF Cross Validation | 

| Contax, Nikkor and Leica R lenses vs Canon | 

| List of Canon Data Comparisons | List of Photodo Data Comparisons |

| Database Download |

| Average MTF | Worst Case MTF | Relative MTF | S to M Ratio |

 | Figure of Merit  | MTF Area Average | Conclusions |

Last Updated 05/06/2008

All Content © 2005-09 Lester Wareham All Rights Reserved     

All material is supplied  as is and without warranty, use at your own risk.  

All opinions stated are the authors own.

All quoted information remains the copyright of the respective authors.

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