Abel Tan Yew Hong, 28, pleaded guilty to 3 counts of insulting the modesty of a woman, with another seven charges considered during his sentencing.
Tan was sentenced to 11 weeks of jail on Friday, 16 April.
Tan was an engineer who took upskirt videos of his victims on escalators, standing behind them and filming them with his Sony Xperia phone.
On 5 September 2019, he followed his victim up 3 flights of escalators to take her upskirt video at Serangoon MRT station.
He was caught on 10 September 2019 when he was filming another video at Bedok MRT station, where a man saw him taking the video and stopped him.
He was then taken to the MRT staff, who called the police on him.
His phone was then seized and examined, and his offences then came to light.
Tan’s defence lawyer said that Tan had become interested in upskirt videos online, noticing that some of the videos were high quality while some were low quality.
He added that his intention was “merely to experiment and find out if his mobile camera could take the high-quality videos he saw on the internet.”
Tan is currently out on bail of $5,000 and is due to surrender himself on 26 April to begin serving his sentence.