What did Martin Luther think of the Orthodox Church and Islam?

I was wondering, since Martin Luther, and the reformists didn't like the Catholic church, what was there opinion of the Orthodox church? And also what their opinions of Islam were. I saw a few quotes on Islam, the Ottomans, and Sulieman the Magnificent, but I would like a few experts to tell me his opinions on them, as it would be very helpful.
 
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