That sounds very heavy... Is it really that way?
And also, you shouldn't put US stamps on your envelope
to Will Smith, you need German stamps there (if you're sending from Germany to US).
It's your included reply envelope, the SASE, which should have US stamps. I can't imagine that a C4 envelope + a picture could weigh 500g.
However, if your SASE + picture weigh 500g, it's about 18 ounces which is
10.40$.
This is why I wonder if your return package will weigh 500g:
One time I sent a C5 envelope including C4 envelope (same size as yours I believe) and an A4 sized picture... this all only weight 50g or less!

Therefore I'm pretty sure 2 or 3 ounces postage will be enough, 1.70$ or 2.55$
That sounds very heavy... Is it really that way?
And also, you shouldn't put US stamps on your envelope [i]to[/i] Will Smith, you need German stamps there (if you're sending from Germany to US).
It's your included reply envelope, the SASE, which should have US stamps. I can't imagine that a C4 envelope + a picture could weigh 500g.
However, if your SASE + picture weigh 500g, it's about 18 ounces which is [b]10.40$[/b].
This is why I wonder if your return package will weigh 500g:
One time I sent a C5 envelope including C4 envelope (same size as yours I believe) and an A4 sized picture... this all only weight 50g or less! :)
Therefore I'm pretty sure 2 or 3 ounces postage will be enough, 1.70$ or 2.55$