F-Stop

#11 of our Curious Conundrums series.

Marti constructed this puzzle. She said "Rich liked the long 12 entries, but thought the 9's were a little weak."

I'm eager to see if anyone notices the extra step Marti took to make this puzzle more elegant to a discerning eye.

Puzzle:

Here is PDF (click on File, then Download Original).

Here is puz file (click on File, then Download).

Spoiler: Here is the answer grid.

Thanks for solving, and we look forward to your comments.

C.C.