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p.4 #5 · p.4 #5 · FotodioX PRONTO: Leica M-Mount to Sony E-Mount with AF! | |
Charlie N wrote:
it's not about reverse engineering, it's so similar to the techart, that it shares the same FLAW, power drain issue
That means nothing. Pretty much every cheap adapter on the market (such as every EF adapter other than Sigma and Metabones I've tried) has the exact same flaw. It's a result of not properly implementing Sony's lens power management mechanisms. Sony bodies keep the lens partially powered after the camera is powered down to reduce initialization time when the camera is powered back up. I believe the intent is that the lens is supposed to cut power to everything except the microcontroller itself, and keep that only powered enough to wait for an interrupt and not lose RAM contents. Lots of Chinese manufacturers probably just keep the microcontroller running at full power.
NOTE: You don't have to pull the camera's battery as a workaround. Unmounting/remounting the lens (only a fraction of a turn, enough to break the LENS_XDETECT connection) is all you need to cause the lens to remain depowered until the next time the camera is turned on.
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rscheffler wrote:
I thought Sony opened their E/FE lens protocol to third parties? But that wouldn't excuse a direct cloning of Techart's hardware and software by FotodioX, if that's indeed the case.
Everyone ignored the key word in Sony's 2011 announcement - "basic". Given the state of most third-party E-mount products SIX years later, including Metabones' explicit statement that they received no assistance from Sony despite being the most qualified for Sony's 2011 program, indicates that "basic" isn't enough to make an AF lens. It likely only contains mechanical specifications.
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