For a few yrs I used a few M-mount lenses adapted to a now 8-yr old a6000. The 40mm (->60) , used most is a bit long. Now I have so much fun w/ these ttArtisan manuals, it is very addictive. It's almost like knocking around w/ a M body, w/o weight of my a7 series. Image quality is just amazing for the price. Cheaper & safer to walk around w/ at night. Very capable lenses used @ f/2 & f/2.8 . Will buy 2 more ; i am not telling which! I will probably get the full frame 20->70 f/4 G before then ( to replace my Tamron 17->28 f/2.8 ?? & get a cheap 16/17 prime? ) Trust me, these Chinese lenses are fun to shoot w/ may be just not for a job. Buy 5 or 6 & u r NOT going to switch camera brand. p.s. part of the fun is they are NOT AF !!! back to a sane future !