[Kerrowdown]

If any relation to a well known brand?

Looking at the technical specs of filters that I came across deep in a bag, which are made with Japanese AGC Glass.

(AGC株式会社, AGC kabushiki gaisha), formerly Asahi Glass Co., Ltd. '(旭硝子株式会社), a Japanese global glass manufacturing company, headquartered in Tokyo.

[photoptimist]

So you are saying that these filters might be a window on the past?

[FozzFoster]

Asahi is a common word in Japan.
It means rising sun/ morning sun.
This is word/symbolism is seen in historic and modern Japan.
There are many, many companies called 'Asahi'

[Kerrowdown]

So you are saying that these filters might be a window on the past?

I guess you've never seen one of those glass cheese graters then... it's a large glass pane with the cut out filter holes in it.

[Kerrowdown]

Asahi is a common word in Japan.
It means rising sun/ morning sun.
This is word/symbolism is seen in historic and modern Japan.
There are many, many companies called 'Asahi'

Ok thanks for the heads up... that's my wee historical bubble burst then.

[Fogel70]

I Wonder if Asahi glass make glass for drinking Asahi beer?

[slartibartfast01]

Ok thanks for the heads up... that's my wee historical bubble burst then.

There may be a few companies named Asahi but how many of them are likely to manufacture optical filters?

Edit. This one apparently judging by the name
https://en.m.wikipedia.org/wiki/AGC_Inc.

[Kerrowdown]

I Wonder if Asahi glass make glass for drinking Asahi beer?

That sounds like a good plan to me... the making of a good symbiotic relationship.

[Kerrowdown]

There may be a few companies named Asahi but how many of them are likely to manufacture optical filters?

Edit. This one apparently judging by the name
https://en.m.wikipedia.org/wiki/AGC_Inc.

I think we've gone full circle back to my original wonder.

[THoog]

Asahi Glass is a dozen years older than Asahi Optical; unless AOCo was a subsidary of AGC all along and Pentax lore has been hiding it, I don't think you can find a relationship. The one possibility I can think of is if AGC bought the filter manufacturing bits when Hoya broke up Pentax, but it seems unlikely Hoya would facilitate a major glass maker to start competing with one of their core businesses.

[Kerrowdown]

Asahi Glass is a dozen years older than Asahi Optical; unless AOCo was a subsidary of AGC all along and Pentax lore has been hiding it, I don't think you can find a relationship. The one possibility I can think of is if AGC bought the filter manufacturing bits when Hoya broke up Pentax, but it seems unlikely Hoya would facilitate a major glass maker to start competing with one of their core businesses.

Thought I'd found a wee gem... like the pot of Gold at the end of the Rainbow.