A Sydney man who filmed up dozens of women's skirts as they stood on escalators at Central train station has been sent to jail for at least 12 months.

Lawyers for Karl Edwin Skow, 59, swiftly launched an appeal against his jail term after a magistrate sentenced him to a maximum 18-months imprisonment for his "sly, predatory acts".

Karl Edwin Skow, 59, pictured at Downing Centre Local Court on Wednesday, has launched an appeal against his prison sentence. Credit:Seven News

He pleaded guilty to three charges of intentionally recording an intimate image without consent.

Police who searched his Barden Ridge home found he used his mobile phone to capture intimate images of about 36 women over four months.