Chris, strangely, i also used google maps but used "astronomy brookvale pittwater road" rather than "telescopes Brookvale" - but nothing came up.
So i tried "astronomy brookvale" again this morning and lo and behold there it was - "Astronomy Online - CLOSED" (in place of York Optical for your search phrase). I think York optical "may" have taken over from Astronomy Online, but this is testing my memory now.
Anyhow, thanks for the leg-up. "Astronomy Online" it was.
Definitely was York Optical.
At least that's what they called themselves when I visited just over 10 years ago.
Sad to see it go.
There was also another dealer at Crows Nest I visited. Astro Optical Supplies. Closed too I believe.
And one at Broadmeadow (near Newcastle) I spent a lot of time and money there when I worked at nearby Lambton.
I think is still operating. Survey and Instrument Specialists.
Thanks for the sleuthing Michael! Your photo has actually happily confirmed to me that it wasn't York Optical, but Astronomy Online :-) The facade was darker and the signage was very different. I suspect York might have bought Astronomy Online out (or even the other way around, who knows?). Also, York optical doesn't sound right, whereas Astonromy Online jags a strong memory.
So, given that both shops were there, you're all hitting sixes.