Yoshizen's Blog

Sony lens myth (3)

Some time ago, I wrote about the strange behaviour of the Sony 30 mm F3.5 Macro lens when it was mounted on the other camera. (Sony lens moves their focus while the lens was not mounted on their Sony camera, = even without having connected to the power.


In fact, I’ve written about the Chinese made NEX-NZ lens mount adaptor, in a postscript in the Homemade NEX-NZ adaptor post.

While testing this Chinese adaptor with Sony / Zeiss 55 mm 1.8 lens on Nikon Z7 camera, I noticed that this lens behaves same as to 30 mm F3.5 lens.

Those 6 photos above are the continuous shot showing how this 55 mm lens moves its focus when the camera was aimed to the outside. The lens moves its focus from Close to infinity then to very close again, obstructing anybody’s attempt to use the lens anywhere else of the Sony camera.

—– It is quite natural that the camera Co, hate other made lens used on their camera, but why they need to block their lens used / tested on the another camera ? — Is that because the lens needed to be used with their own correction program such as Chromatic, Distortion correction built into their image procesor ?

As I wrote it before, the most interesting question is, what kind of device or mechanism made such function works. —– the focus motor might be a silent stepper motor kind (but it makes some noise) though, what sort of the power back-up system maks its function keep working, —– how it retains the power without having the trouble of re-charge ? ? ? ? — small battery or super capacitor kind ? (Sony didn’t give any answer for those inquiry. — and I haven’t disassembled and checked inside of the lens yet.)


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