Mark Gowin
Member
Following the recent discussions in the "more fun images" thread and particularly Thomas's comments regarding corner sharpness I decided to shoot a brick wall and see what happens.
Test setup:
*Leica S2 with 70mm Summarit mounted on a Gitzo 1325 tripod with RRS BH-55 head.
*Camera to wall distance was approximately 2.8 meters.
*There is no easy way to ensure the camera sensor plane is exactly parallel to the wall so I did my best and quit worrying about it.
*Autofocus was used just prior to first photo and was not changed for subsequent shots (I know one should use focus bracketing for a lens test, but I didn't want to bother as I wanted to see how accurate the autofocus was because that is how I use the camera - not focus bracketing)
*Shot tethered to MacBook Pro using Leica's Shuttle software
*Raw conversion in LR 3 Beta 2 using defaults with the only adjustment being my standard sharpening (amount - 50; radius - 0.7; detail 35). I made no attempt to white balance or equalize exposures. Note: I think the variation in corner colors are representative of the actual scene because the wall was under an awning and there was a color temperature variation from top (more shade) to bottom (brighter due to reflection off sidewalk).
I know some or many will find faults with my test method and that is OK. It tells me what I wanted to know and I am happy.
First the full image f2.5
Next a center crop f2.5
Top Left corner f2.5
Top Right corner f2.5
Bottom Left corner f2.5
Bottom Right corner f2.5
Test setup:
*Leica S2 with 70mm Summarit mounted on a Gitzo 1325 tripod with RRS BH-55 head.
*Camera to wall distance was approximately 2.8 meters.
*There is no easy way to ensure the camera sensor plane is exactly parallel to the wall so I did my best and quit worrying about it.
*Autofocus was used just prior to first photo and was not changed for subsequent shots (I know one should use focus bracketing for a lens test, but I didn't want to bother as I wanted to see how accurate the autofocus was because that is how I use the camera - not focus bracketing)
*Shot tethered to MacBook Pro using Leica's Shuttle software
*Raw conversion in LR 3 Beta 2 using defaults with the only adjustment being my standard sharpening (amount - 50; radius - 0.7; detail 35). I made no attempt to white balance or equalize exposures. Note: I think the variation in corner colors are representative of the actual scene because the wall was under an awning and there was a color temperature variation from top (more shade) to bottom (brighter due to reflection off sidewalk).
I know some or many will find faults with my test method and that is OK. It tells me what I wanted to know and I am happy.
First the full image f2.5
Next a center crop f2.5
Top Left corner f2.5
Top Right corner f2.5
Bottom Left corner f2.5
Bottom Right corner f2.5
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