https://www.youtube.com/watch?v=VlEJOU0FjDI
in this video the guy, Chris. goes into some of the functions and differences between similar lenses and then get into the key information about the lens. such as, focal lengths and apertures. these can only be changed by the lens itself due to it being manual. this also keep the price of the lens down whilst not hindering the quality.
the biggest change which concerns me is the difference between f/3.5 and f/5.6 begauce the sharpness and contrast differences are dramatically improved and after testing this out for myself i noticed the same results. i think its down to the fact that theres a stop between every aperture setting other than between 3.5 and 5.6.
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