Speedbooster : Question + an idea
Re: Speedbooster : Question + an idea
PhotosByHall wrote:
A speedbooster is manual focus only, because you are mounting EF to EF-M. What if the connection was EF both sides? You would then put pass through contacts on it a la an auto focus extension tube. You'd then fit the speed booster into the EF->EF-M adapter and you'd have an autofocusing speedbooster that lets you mount full frame on the EF-M cameras!
Is this optically impossible? I don't believe it already exists...
Cheers!
It unofficially exists. A guy in Korea handmakes these from autofocus capable adapters and sells them on ebay for about $300. I've had one for a while.
In general speedboosters are meant for video, not really photography, to help negate sensor crop factors while using fast FF primes and allow extra stop of light so lower ISO can be used.

Sony a7R III
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Sony FE 55mm F1.8
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