hugo rodriguez

Hi Frans, I'm back after a few days of vacation. I've done several tests with the different images into Imatest, ImageJ and MTFM and will share them with you. It's quite interesting.

I'll be out for a few days, will reply you when I'm back :)

Aha, I understand. I¡ll try to make some tests with other angles but 5º. With distortion I really meant other angles but 5º instead of curved edges, which is hard to find unless you test some fisheye lens or othe really distorted (though these days are quite common as many manufacturers as you know hide that under the 'manufacturer profile'). And in the first paragraph you already answered that. Ok, so to make readings is better to correct the vignetting (even roughly) than to keep the image 'as-is'....

All these is because I'm helping a friend, the man behind this website that specializes in lens testing: www.digitalcamaralens.com Actually I'm comparing this particular lens: https://www.digitalcamaralens.com/Html/Objetivos/Yongnuo/100_2.0/Yongnuo-100_2_Analisis.htm He needs to optimize the workflow for testing because it takes so much time in boring tasks. I'm trying to convince him to use MTFM instead of ImageJ with SE_MTF_2xNyquist. But he is worried by seeing how different are the results specially...

Ok, I'm sending you the files I used through WeTransfer for this test as well as some RAW from a Tamrom 16-30mm with a SONY a7R II at all apertures. Please confirm me that you receive the email. It will expire in 3 days, but don't worry if you can't download it. I can also upload then to GDrive if you need.

Hi Frans! Thanks for such a detailed response. Well, all that you explained is the same as I already knew, so I think we are talking the 'same language', great then :) I couldn't create that image with that code as I'm no expert with command line. I wrote this into the program files/MTF mapper: mtf_mapper.exe mtf_generate_rectangle -m 1.0 -n 0 -o sharp.png But got and error... any help will be welcomed :) Regarding the differences between Imatest, sfrmat and MTFMapper I found an article of a friend,...

Hi Frans, That's right, and that's exactly what I always thoughit was: a cycle is the same as a pair of lines. I also did a research in Imatest documentation and confirmed what I did know: a cycle is the same as a pair of lines. Anyway, when you say that " If one line pair is the same width as a pixel, we have one line pair per pixel, which is also one cycle per pixel" I guess you mean a 'pair of pixels' instead of a single pixel because it's simply impossible to have a cycle per pixel. Or maybe...

Hi Frans, thanks a lot for your kind reply. 1) Well, I don't know the sensor model but I used RAWDigger to dig into the manufacturer metadata and there I found the value I was looking for: 6080 photo detectors. I assume it's right. Not a big difference, though, between 6016. 2) Regarding Imatest, I've just realized that when I entered 5.96um as the pixel pitch, the units were 'pixel per inch' instead of 'microns per pixel' which I think is the right one. See attached image. However, this didn't made...