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makron
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DPreview of 50D is flawed ..please read


just like to point out some facts:

Dpreview used the canon 50/1.4 @ f8 (please correct me if i\'m wrong)

The MEASURED resolution of the 50mm/1.4 at f8 is 70 line pairs per mm (50% MTF).
here: http://www.wlcastleman.com/equip/reviews/50mm/index.htm
(please read in detail how is this measured)

50D (based on 15Mpixel) resolution is 105 line pairs per mm
40D (based on 10Mpixel) resolution is 86 line pairs per mm

Theoretical (http://www.luminous-landscape.com/tutorials/resolution.shtml)
for f8 is 86 line pairs per mm (50% MTF)

And you don\'t expect the Canon 50/1.4 @f8 to outresolve the theoretical resolution do you?

You decide for yourself.


update:

Please note that 50% MTF is \"perceived image sharpness\" as defined in the first link and absolute resolution is higher. The image can be sharpened to \"bring out\" the details so that it can be \"perceived\" by human eyes.

one line pairs per mm means one white and one black line per mm. In pixel term is 2 pixels per mm (one pixel for white and one pixel for black)



Oct 31, 2008 at 07:18 AM
makron
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DPreview of 50D is flawed ..please read


just like to point out some facts:

Dpreview used the canon 50/1.4 @ f8 (please correct me if i\'m wrong)

The MEASURED resolution of the 50mm/1.4 at f8 is 70 line pairs per mm (50% MTF).
here: http://www.wlcastleman.com/equip/reviews/50mm/index.htm
(please read in detail how is this measured)

50D (based on 15Mpixel) resolution is 105 line pairs per mm
40D (based on 10Mpixel) resolution is 86 line pairs per mm

Theoretical (http://www.luminous-landscape.com/tutorials/resolution.shtml)
for f8 is 86 line pairs per mm (50% MTF)

And you don\'t expect the Canon 50/1.4 @f8 to outresolve the theoretical resolution do you?

You decide for yourself.


update:

Please note that 50% MTF is \"perceived image sharpness\" as defined in the first link and absolute resolution is higher. The image can be sharpened to \"bring out\" the details so that it can be \"perceived\" by human eyes.



Oct 31, 2008 at 07:15 AM
makron
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Upload & Sell: Off
DPreview of 50D is flawed ..please read


just like to point out some facts:

Dpreview used the canon 50/1.4 @ f8 (please correct me if i\'m wrong)

The MEASURED resolution of the 50mm/1.4 at f8 is 70 line pairs per mm (50% MTF).
here: http://www.wlcastleman.com/equip/reviews/50mm/index.htm
(please read in detail how is this measured)

50D (based on 15Mpixel) resolution is 105 line pairs per mm
40D (based on 10Mpixel) resolution is 86 line pairs per mm

Theoretical (http://www.luminous-landscape.com/tutorials/resolution.shtml)
for f8 is 86 line pairs per mm (50% MTF)

And you don\'t expect the Canon 50/1.4 @f8 to outresolve the theoretical resolution do you?

You decide for yourself.


update:

Please note that 50% MTF is \"perceived image sharpness\" as defined in the first link and absolute resolution is higher. The image can be sharpened to \"bring up\" the details so that it can be \"perceived\" by human eyes.



Oct 31, 2008 at 07:05 AM
makron
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Upload & Sell: Off
DPreview of 50D is flawed ..please read


just like to point out some facts:

Dpreview used the canon 50/1.4 @ f8 (please correct me if i\'m wrong)

The MEASURED resolution of the 50mm/1.4 at f8 is 70 line pairs per mm (50% MTF).
here: http://www.wlcastleman.com/equip/reviews/50mm/index.htm
(please read in detail how is this measured)

50D (based on 15Mpixel) resolution is 105 line pairs per mm
40D (based on 10Mpixel) resolution is 86 line pairs per mm

Theoretical (http://www.luminous-landscape.com/tutorials/resolution.shtml)
for f8 is 86 line pairs per mm (50% MTF)

And you don\'t expect the Canon 50/1.4 @f8 to outresolve the theoretical resolution do you?

You decide for yourself.



Oct 31, 2008 at 05:59 AM





  Previous versions of makron's message #6331851 « DPreview of 50D is flawed ..please read »