How to test your lens?
How to test your lens?https://www.bhphotovideo.com/explora/photography/tips-and-solutions/how-test-your-lens/bi/2446/kbid/3285
個像場set up要十分準確,尤其測試大光圈時候。 it is an interesting read.
however, just like what Chinese-Tee has said, it's too troublesome to set up. i just rely on the reviews from lensrentals. :P
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