Ahmed Abu Derra was acquitted of two other charges -- of spreading "lies" through his reports on the army's campaign against Islamist militants in the Sinai Peninsula and of taking pictures of waterways in the Suez Canal, said one of his lawyers, Mohammed Hanafi.
"My client has been given a six-month suspended jail term but he is acquitted of the two other charges," Hanafi said. "We are completing the procedure to secure his release today."
Abu Deraa, who writes for the independent daily Al-Masry Al-Youm, was detained on September 4 in north Sinai over reports that army raids had hit a mosque and houses, as well as injuring civilians.
Authorities say they are targeting "terrorists" in the lawless Sinai Peninsula which borders the Gaza Strip, run by the Palestinian Islamist movement Hamas.
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Military spokesman Ahmed Ali last month explained Abu Derra's detention and military trial.
"Investigations showed that Mr Abu Deraa spread lies, saying that the Egyptian armed forces were attacking mosques, women and children. He deliberately spread false news," Ali told reporters.
Such charges came under the jurisdiction of the military.
Civil society groups have slammed the increasing number of military trials of civilians since the army ousted Islamist president Mohamed Morsi on July 3.