ITAP of a Lightbulb on an iPad

Image from and submitted by IT8055
image showing ITAP of a Lightbulb on an iPad

IT8055 on March 19th, 2023 at 21:31 UTC »

iPad with a colourful background reflecting onto the lightbulb. 90mm lens, f18, iso 100, 10 second exposure; Sony a7iii.

BigEvilDoer on March 19th, 2023 at 21:35 UTC »

Fantastic idea.

lonely-with-her on March 19th, 2023 at 22:00 UTC »

Honestly curious question: why the 10 second exposure? I assume that you absolutely wanted the iso at 100 to keep the noise out. And you want the narrow aperture for the depth of field. But you could have gotten that with pretty much anything over f8, and f18 seems like risking diffraction. So I guess what I’m asking is did you prioritize the shutter because you wanted that long exposure or did you prioritize the aperture because you wanted the depth of field?