Er, you need to Google better.

LA-EA1 = APS-C, contrast-detect only
LA-EA2 = APS-C, phase-detect with translucent mirror
LA-EA3 = FF, contrast-detect only
LA-EA4 = FF, phase-detect with translucent mirror

Contrast detect is super slow on my A7S - I have the LA-EA1 with the rear baffle removed to make it full-frame, and even in bright daylight, it focuses slowly. Just go for the LA-EA4 if you want to use A-mount lenses.

finally, someone speak the right word. (lately all gear comparison and complain talks)....
hello~ using EA adapter.... u say leh? using EA1/3 will work on normal contrast detect which is even slower then native e lens

be friendly la, no sikit sikit scold others. Jesus loves you 

yea, we kawan jahat one... wahahaha

eh, we talking about adapter u jump in without proper introduction we sure thinking u talking about adapter le....

anyway, to answer you... once you reach iso6400 environment, the A7II will fail, the A7s continue to focus lock up to iso 25600 or more without AF assist.

edit: the PDAF works up to around 1600iso (@f2.8, not sure even the PDAF on sensor works like dedicated F2.8 sensor or not, or up to F3.5 standard)... and for contrast detect, which rely how clean the sensor can send the data/contrast to be detected, the FF 24mp work up to 6400 plus minus, but the A7s 12mp work all the way to 51200 (without AF assist).... so, when it gets dark, the A7s still rocks every camera out there...
PDAF is exclusive for Native Sony E mount. even 3rd party(sigma) lens native E also cant use the PDAF. thats the only way to help/keep sony keep selling their lens...

so, not even the older nex6 with PDAF assist works in either adapater nor non-Sony E mount lenses.
albert, if im not wrong, sony never bother to update the algorithm for the EA-CDAF (last was 1.02? or 1.2?).... so basically lastest A6000 or A7II EA1/3 PDAF is as fast as oldest nex3 with same EA1/3 (with the same lens to lens. SAM to SAM, SSM to SSM)....     

hi guys..wanna ask again about A to E adapter. i wanted to buys LA-E2 adapter for my a6000. got a very good 2nd hand price. but some people recommend me to get the LA-E4 instead because it is new (possibly better electronics), has better PDAF (not sure) and has the Fullframe capabilities. it means it is future proof if someday im going to use sony E mount full frame camera. but i dont think i will jump to a FF camera and so far im fine with the crop sensor..need opinions on 'better Electronic and faster AF'..is the LE-A4 really that superior?

thanks

thanks the both of you for the feedback. The sudden desire to change is because my company has some decent discounts with sony as well. not so much the grass is greener, as i am very much in love with fuji's viewfinder compared to sony's puny one. but yea each has good pros and cons.

Also i was considering which lenses are meant for the mirrorless A mount, and i was very confused by the naming and the mounts. Can i assume all full frame a mount lenses are for the A7? or are some for mirrorless and some for mirrored? if it is the latter, how do i know? whats in the naming of the lenses?

thanks

For EF mount, you need EF (EOS) to E Mount but manual focus.
http://www.bhphotovideo.com/c/product/9949...r_canon_ef.html
If you have budget, get the Metabones and you still get Auto focus
http://www.metabones.com/products/details/MB-EF-E-BM4