Peter Chant wrote:

I put square prints in square frames.
;-)

Ah ha - so when I mess up and get vignetting do I need to get round
frames?!

:-)

Why, yes!

But don't stock up on them, else you will be forced to mess up more often
than you perhaps might like to.
Though on the other hand... being forced to mess up - so you can fill those
frames - is a good excuse for messing up.