A:AnswerHi mike, Sony's commitment to customer satisfaction is our top priority. The camera does have viewfinder and the aperture of the lens is F2.8 (W) – F4.5 (T). Thank you so much for your question. And thank you for choosing Sony. - Pakorn (Sony Social Support)
A:AnswerHi Shy, Sony's commitment to customer satisfaction is our top priority. The camera does not have portrait mode for video. You can still vlog with the camera but you will have to rotate the video in the editing software before posting on YouTube. Thank you so much for your question. And thank you for choosing Sony.
A:AnswerHi Clickclickbang, Sony's commitment to customer satisfaction is our top priority. The camera can transfer images captured to iPhone using Imaging Edge Mobile app available on Apple App Store. It will use wireless network to transfer instead of Bluetooth. Thank you so much for your question. And thank you for choosing Sony.
A:AnswerHi UMSPAVE, Sony's commitment to customer satisfaction is our top priority. The camera does come with an integrated microphone. Thank you so much for your question. And thank you for choosing Sony.
A:AnswerHi, h! Yes, the camera has a "Dual Rec" function. You may refer to this link for more information:
https://helpguide.sony.net/dsc/1740/v1/en/contents/TP0001537518.html
~Ralph