Activity for Pryzet
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Pryzet posted a comment on discussion General Discussion
Hi, I did more experiments a bit of time ago but did not have time to share it here. I did use some batch script to run MTF-Mapper on hundreds of pictures collected over a long period of time. Then I used batch crop of the result pictures and batch OCR to collect the offset value form the cropped picture (did not find a way to get the offset value in a text file). With this I have been able to run long tests without wasting time collecting offset values. The first test I did was to save pictures...
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Hi Frans, Thank you for your detailed answer. I end up using the A2 chart on A3 paper because I though the software was struggling with my "low resolution" sensor (compared to most DSLRs). But I face the same focus shift issue with A3 chart on A3 paper with all fiducial markers visible. Regarding your question about the MTF measurements meeting my needs. To be honest I did not try this a lot as I a currently most interested in the focus feature. Then I may spend some time measuring MTF of my lenses...
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Hi Frans, Thank you for your detailed answer. I end up using the A2 chart on A3 paper because I though the software was struggling with my "low resolution" sensor (compared to most DSLRs). But I face the same focus shift issue with A3 chart on A3 paper with all fiducial markers visible. Regarding your question about the MTF measurements meeting my needs. To be honest I did not try this a lot as I a currently most interested in the focus feature. Then I may spend some time measuring MTF of my lenses...
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Hi Frans, Thank you for your detailed answer. I end up using the A2 chart on A3 paper because I though the software was struggling with my "low resolution" sensor (compared to most DSLRs). But I face the same focus shift issue with A3 chart on A3 paper with all fiducial markers visible. Regarding your question about the MTF measurements meeting my needs. To be honest I did not try this a lot as I a currently most interested in the focus feature. Then I may spend some time measuring MTF of my lenses...
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Hi, I'm trying to use MTF Mapper Focus chart to measure the focus shift of IR corrected lenses (CCTV lenses) from different manufacturers between white LEDs and IR 850nm lighting. The phenomenon I want to measure is the same as the chromatic aberrations we can notice between Red Green and Blue channels on and RGB picture. My goal is to do a rough focus on the chart with white LEDs, note down of the estimated chart distance and MTF peak position, then turn off the white LEDs and turn on the IR 850nm...
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Hi, I'm trying to use MTF Mapper Focus chart to measure the focus shift of IR corrected lenses (CCTV lenses) from different manufacturers between white LEDs and IR 850nm lighting. The phenomenon I want to measure is the same as the chromatic aberrations we can notice between Red Green and Blue channels on and RGB picture. My goal is to do a rough focus on the chart with white LEDs, note down of the estimated chart distance and MTF peak position, then turn off the white LEDs and turn on the IR 850nm...
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