Each to their own but I am not a big fan of using iPhones and iPads while observing. Even dimmed down and with with red screen they are really bright and destroy night vision. The thing people often forget is that to preseve night vision you must use a DIM red light, I have painted red nail polish on my headlamps to reduce the light a bit as they are too bright natively, and screens are much brighter than my headlamps.
Malcolm
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