Help me understand aspect ratio and working in light room

[spiralout462]

So pleased we get A sized papers over here. So much easier. Prepare for print once and it scales to any paper size.

European units of measure make so much more sense!!

 

[table1349]

So pleased we get A sized papers over here. So much easier. Prepare for print once and it scales to any paper size.

European units of measure make so much more sense!!

 

[Advanced Photo]

So pleased we get A sized papers over here. So much easier. Prepare for print once and it scales to any paper size.

They are available here as well if you wish to buy them. Most people prefer the ones they grew up with and understand better though. Most of what I do is all custom sizes and custom made frames though so the standards don't really affect me.