The Holding Tank

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MTF Study

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50mm Region

 

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

 | Figure of Merit  | MTF Area Average | Conclusions |

 

Conclusion

 

f8

Easy, both prime lenses are vastly superior.  

All the 50mm primes provide superior performance over almost the whole frame and are clearly much better than the zooms. The new f1.2L prime stopped down performance is almost identical to the f1.4.

The 24-70mm zoom can almost provide superior performance over 100% of the 1.6X crop factor frame.  

The new EF-S 17-55mm f2.8 IS has similar performance to the 24-70 up to the 10mm radius circle after which performance drops off.

Max Ap

The prime lenses are faster than the 24-70mm zoom so the better performance of the zoom is to be expected. The f1.2L performance is close to the f1.4 with slightly lower contrast and fine detail as might be expected.

It is worth noting that despite the speed difference the prime’s have very comparable maximum aperture detail performance to the zoom.  

Again the new EF-S 17-55mm f2.8 IS has similar performance to the 24-70 up to the 10mm radius circle after which performance drops off.

The Bokeh judgment seems to be as good out to 15mm offset beyond which the zoom is better. Interestingly the primes have similar performance indicating the quality of the f1.4.  

 

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.

Any trade marks mentioned are the property of their owners.

  

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