The Infinity USB Knob

But the clever bit was when Hertzstark got rid of all the number registers and replaced them with a single unit called a step drum. This, as the name implies, is a drum made of metal cut in steps to correspond to different numbers. He then simplified things even further by adding a second drum on top of the first in reverse, so a simple shift in th... See more

"I had an idea… I should look at everything backwards… I'll pretend I have already invented everything. What does this kind of machine have to look like, so someone could use it?” Curta calculator: The mechanical marvel born in a Nazi death camp:

we do use these functions, we changed the AF/MF button from its default [AF/MF Control Hold] to [AF/MF Ctrl Toggle]. We find it cumbersome to continually press the button to keep the lens in manual focus mode. It’s too easy to release the button while you turn the focus ring and therefore mistakenly switch to automatic focus. If you use the toggle

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"I started to concentrate on possible solutions and at first, naturally, didn't get any further," said Hertzstark. "Later, I had an idea that I should look at everything backwards. I thought to myself, I'll pretend that I have already invented everything. What does this kind of machine really have to look like, so that someone could use it? It cann... See more