06-04-2019, 10:36 PM
It is very likely that you can compare MTF of various lenses - if the procedure to get the numbers remains the same.
Manufacturers partly use the calculated MTF and not the real MIF and they try to let the lens look a bit better. Comparative MTF charts, wide open (and oftenonly wide open, while OL tests at various apertures) you can get over at lensrentals.com/blog
https://www.lensrentals.com/blog/2019/04/just-mtf-charts-rokinon-samyang-lenses/ (no 45/1.8 though, as Samyang appears to be too cheap to rent - people who want one, simply buy it.
In the case of Samyang, I too often read "not bad, if you get a good copy - and don't every try to get it repaired".
Manufacturers partly use the calculated MTF and not the real MIF and they try to let the lens look a bit better. Comparative MTF charts, wide open (and oftenonly wide open, while OL tests at various apertures) you can get over at lensrentals.com/blog
https://www.lensrentals.com/blog/2019/04/just-mtf-charts-rokinon-samyang-lenses/ (no 45/1.8 though, as Samyang appears to be too cheap to rent - people who want one, simply buy it.
In the case of Samyang, I too often read "not bad, if you get a good copy - and don't every try to get it repaired".