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The LA-EA3 is for lenses with in-lens motors - which would cover all but the Sigma 100-300
The LA-EA4 has a built in AF motor, and so can drive lenses designed for in-body AF motors, including your Sigma 100-300.
So you could get an LA-EA4 and it would allow you to use all of your lenses on the A6400.
BUT
The LA-EA4 also includes it's own AF system, using a (fixed) SLT mirror.
Which means you 'loose' ~ 1/3 stop of light (it's diverted to the AF module), and you are limited to the LA-EA4 AF system.
So you are noticeably better off using an LA-EA3 for lenses which it supports (as it has no impact optically, and uses the A6400 AF system).
Given that you have the 16-50 f/2.8, I'd be tempted to either get the A6400 body only, or just with the 16-50 kit - either that or get the 18-105 and sell the 16-50 f/2.8 - I'm not sure you'd want both.
The only reason for getting the 16-50 kit is that it's so small when powered down - on my A6000 I can fit camera & lens in a coat pocket - and while it does have compromises to achieve the small size, in-camera jpegs correct for most, and LR profiles do the same for RAW - and you can create great shots in an extremely compact set up. |
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