ASK JIM

Every month, Jim will answer a question from his online students, from people who participate in his tours and workshops, or from subscribers to this magazine. If you have a question you’d like Jim to answer, please drop him a note at photos@jimzuckerman.com.

Q: Jim . . . Do I use auto ISO for HDR?

Edward Gabelman, Cinncinati, Ohio

A:No, it’s best to use a fixed ISO. With HDR, there should be one variable that gives you the bracketed images, and I feel it is best to make that variable the shutter speed. If the ISO varies, you’ll have different types and amounts of noise for each image and I think that may not look good. §