Sony a7 and Panasonic GX7: Two Cameras sitting on my desk. Must return one.

Started Jan 5, 2014 | Discussions thread
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tesilab
tesilab Senior Member • Posts: 2,527
Disadvantages of using the LA-EA4 adapter

As already noted, the LA-EA4 will focus much faster because it is a true PDAF focusing system. You should be aware of the tradeoffs and limitations:

1. It will be fast, but not A99 fast. The AF implementation I have read is closer in performance to one of the less expensive Alpha cameras, the A55/A57.

2. It will of course add some serious bulk, and it won't feel like a balanced system.

3. PDAF ,while fast, could entail focusing inaccuracy, since there are two alternate light paths, which could potentially be miscalibrated. Back focus/front focus are issues that you might encounter in a focusing system that doesn't read directly off of the sensor.

4. Any adapter in the lens path creates more room for error with regard to tolerances. It could affect corner to corner sharpness. The same lens might give a better performance on a native mount than adapted.

5. Less light. The translucent mirror in the adapter diverts light from the sensor. This results in about a 1/3 stop loss of light.

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