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next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL
#13
[quote name='flektogon' timestamp='1300408035' post='6918']

But this is exactly what I was pointing at. The same lens (if we assume that there were no lens sample variations) mounted on the 10 Mp Pentax camera achieved 2180 pixels (per the image hight) resolution, while mounted on the 8 Mp Canon camera it achieved only 1999 pixels. For sure, poor lenses will show more less the same resolution regardless of the sensor resolution. But a high quality lens will be much more limited by the sensor resolution. And while the sensor requires use of the AA filter (which is still the case even of contemporary 18 Mp sensors), it clearly means that their spacial resolution is still below the Nyquest frequency. Yes, once the future sensors have maybe more than 20 Mp, then their resolving power will not limit even the best lens. How much pixels such sensors would need? I remember, that best lenses from the film era could not resolve more than 100 lp/mm, so let's use that number, though today's lenses, optimized for the APS-C size sensors could have (much) higher resolution. To satisfy the sampling theory, the sensor without a need for the AA filter should have 2 x 100 x 16 (the APS-C sensor hight) pixels in the vertical direction, which is more than 15 Mp for the entire sensor. So, the same lens tested on a camera with a 10 Mp and 16 Mp sensor will show very different resolution.

[/quote]

no, you keep focussing on the NUMBERS. Don't do that.... just look at the bars themsleves, in relation to the vertical axis. Not the numbers, but the maximum achievable. The horizontal lines in each graph are meaning the same thing, even if the numbers, for the higher res. sensor, are higher.



So.. the top line is the max achievable. The next line is to what is considered excellent. And so on.Erase the numbers, and just compare the graphs,



As you can see, the bars for the k10 and 350D + tamron then are pretty much the same.

Similar, the graphs of the 350D and 50D are pretty much the same, with the same lens.



Only when the measurements go very low, you will start to see a difference.



And with this knowledge, you can more or less compare the new 35mm f2.4 with the very good discontinued 35mm f2 and the nice 35mm f2.8 macro. Just disregard the numbers on the scale, and only look at the graph itself.
  


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 flektogon - 03-18-2011, 12:27 AM
next PZ lens test report: Pentax SMC DA 35mm f/2.4 AL - by Brightcolours - 03-18-2011, 12:35 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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