Quote Originally Posted by marciofs View Post
I try to understand how long time I would need when flashing the paper, or burning the up half image without compromise the blacks.

Based in this test, it looks to me that I would need expose the paper for at least 3 sec, or burn the sky for 3 sec, in order to make the sky a bit light grey.

But I have a strong feeling that I am look at it in a very wrong way:

This 3sec dodge is what I actually did to come up with the result I posted before.
Hi marciofs,

Thanks for sharing your test strip. I'm thinking about advice from a book "Looten's on Photographic Enlarging and Print Quality" and seeing that you have the darks well represented with the most exposure times... up to the sky represented with the least times.
Maybe flip it around - so that you can see what happens in the skies when you give them extremely long exposure times. Not that it would be what you would finally give them at print time. But to show you what potential drama might exist in the sky at print times you might not normally choose. He gave an example where the test strip showed decent "straight" print at 20 seconds but with skies at 80 seconds the clouds became more dramatic.

Your print, I like with blank sky. The advice from Lootens is generic - for next time you find a tough negative and you don't know what the sky shows - maybe you will find one where the sky needs to be made dramatic in the print... His generic advice is to make test prints that show far more and far less exposure than you think you will ever give. So you will know what is too far in each direction.