THIS is why I returned the Speedbooster

[Ralph B]

Here is a zip file that contains two 1920 x 1080 frame grabs taken with the Sony A7s, one in full frame mode without the Speedbooster, and one in APS-C mode with the Speedbooster. Same lens (Minolta 58mm @ f2), same exposure (1/60 sec), same ISO (12,800).

The results pretty much speak for themselves.

https://www.sendspace.com/file/ly1l9e

IMPORTANT: When downloading fron Sendspace, only click on "Click here to start download from sendspace". DO NOT CLICK ANYTHING ELSE!

 

[optitek]

Try readjusting the focus- the cars are out the background is sharp.

 

[PSA1]

It is not the fault of the metabones, it is noisier in APS-C mode I'm sure.

 

[goodgoings]

It looks like the edges smear a little more making it more blurry. I kind of like this look for films but for photography, no.

It will be noisier in APS-C mode if that is something you don't like, but it looks like you are shooting at a fairly high ISO. People shooting video with the A7S tend to overexpose a stop or more and bring the exposure slider down to hide the noise. At lease that is the current findings. If you did not change the ISO the speedbooster is giving you that extra stop of light, but also showing more noise.

 

[Samuel H]

I love my speedbooster, but f/2 may be a bit too wide for it: you're turning the lens into a 35mm f/1.4 and usually those are soft wide open

Here are my thoughts and tests about the speedbooster