Any good tutorial on Optical Size?

Glyphs
1

Hello,

Please point out to some good resources on Optical size and how to use it.
I have read the appendix provided in hand book.

Thanks and regards.

2

I can recommend the book by @TimAhrens and Shoko Mugikura.

Technically, opsz works just like any other design space axis. See the Multiple Master and Variable Font tutorials.

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3

Thanks @mekkablue for the heads up.

@TimAhrens please let me know the name of the book @mekkablue mentioned.

Thanks and regards.

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5

Thanks @DaveBailey.