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next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL
#11
[quote name='flektogon' timestamp='1300398989' post='6915']

What are talking about? Those bars are nothing else than graphical representation of the resolution numbers! The only way to tell, which lens has higher resolution then the others is to test/measure their resulution under the exactly same conditions.

[/quote]

The bar's height have a direct relation to the maximum achievable resolving power of the camera used. You do not have to take my word for it, but you really can get a really good impression of a lens' sharpness just by comparing the bar height in relation to the vertical axis, without looking at the measured numbers.



Two examples:

Pentax K10 with Tamron 90mm f2.8 DimMacro:

[Image: mtf.gif]

Canon EOS 350D with same Tamron 90mm f2.8 Di macro:

[Image: mtf.gif]



Canon EOS 350D with Canon EF 100mm f2.8 USM macro:

[Image: mtf.gif]

Canon EOS 50D with Canon EF 100mm f2.8 USM macro:

[Image: mtf.png]



As you can see, the bars show a very similar height both for the 10mp Pentax K10 and the 8mp Canon EOS 350D, both with a Tamron 90mm.

And same with the bars for the 8mp 350D and 15mp EOS 50D, both with a Canon 100mm macro.



The vertical axis is important, it shows the maximum achievable resolution for the sensor. Since for each camera the scale on the vertical bar is different, you can compare results from the K10 tests and the K5 test. Only when a lens starts to resolve about half the maximum achievable reults, you will start to see real differences between sensors with different resolutions.
  


Messages In This Thread
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by AlbertoM - 03-15-2011, 06:19 PM
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by flektogon - 03-17-2011, 02:21 PM
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by flektogon - 03-17-2011, 09:56 PM
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by Brightcolours - 03-17-2011, 10:20 PM
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by flektogon - 03-18-2011, 12:27 AM
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by flektogon - 03-20-2011, 01:20 PM
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by flektogon - 03-20-2011, 06:46 PM
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by flektogon - 03-20-2011, 08:37 PM
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by arvydas - 03-20-2011, 10:45 PM
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by Christos - 03-22-2011, 06:07 PM
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by Christos - 03-22-2011, 08:17 PM
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by Christos - 03-22-2011, 09:41 PM
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by Christos - 03-22-2011, 09:45 PM
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by froeschle - 04-20-2011, 01:30 PM
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by Christos - 04-20-2011, 02:09 PM
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by Christos - 04-20-2011, 05:21 PM
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by Christos - 04-22-2011, 06:10 AM
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by Christos - 04-22-2011, 06:47 AM
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by Christos - 04-22-2011, 07:31 AM

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