I'm creating a magazine in Indesign and have pdf ads that I imported and placed all throughout the magazine. The pdf ads are crisp and clear in their original format, but when I place them in Indesign, they're super blurry. I tried converting the pdf ads to a bunch of different formats (jpeg's, png's, etc), then placed them in Indesign. This reduces some of the blurriness, but when printed, they are still unreadable.
Just to show you what I mean, here's an ss of a pdf in Adobe Reader:
and here's how it appears in InDesign:
Both are at 100%.
Do you have any idea why I'm having this problem, and how I might be able to fix it?