Other SDM-AF and Screwdrive-AF supporting extension tubes?

Started May 5, 2014 | Questions thread
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Other SDM-AF and Screwdrive-AF supporting extension tubes?
May 5, 2014

Does anyone know any other extension tubes which allow the use of SDM-AF, correct metadata and normal screwdrive AF other than the Kenko 25mm?

I am quite pleased with the combination of DA*300mm F4 + Kenko 25mm extension tube + HD TC x1,4.

It gives a 1:2.3 maximum magnification at a MFD of 125cm.

The magnification is more than good enough for 80% of my macro uses.

The image quality is outstanding (everyone knows what the DA*300 is capable of).

And the distance you can keep to your subjects is about 200% of the one you get by just using a 180mm macro lens to achieve the same magnification.

All this with silent SDM autofocussing.

I just wonder if there are more extension tubes like this?

This question has not been answered yet.
Leica X1
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