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   meso (meso@the.asbestos.cafe)'s status on Sunday, 19-Jan-2025 06:01:36 JST meso

   in reply to
   @waifu aperture is a diaphragm on your lens that you adjust how open it is. its the part of your lens thats like the aperture science logo
   
   it has an aperture number, or f number depending on how open it is. the more open it is, the lower the number. for example my camera's lens is f1.7 at its most open. i have some way of visualizing this in my brain so that it's intuitive a smaller number is a bigger opening but i cant explain it. but yeah, at its most closed my camera lens is f16.
   
   it's some mathematical ratio of how much light it lets in so the smaller the number the closer it is to giving 100% of the light or some shit. there's less than 1.0 aperture though so idk.
   
   aperture is important because you must juggle the three different settings when shooting film to achieve the correct exposure, otherwise the image is too bright or too dark
   
   the more open that aperture is, the more light it lets in. so you can shoot at faster shutter speeds, for example at 1/1000th sec shutter speed there's light coming in for a fraction of a second, the more open the aperture is, the more light it lets in during that period.
   
   ISO is the sensitivity of your film, the bigger the number the bigger the grain size. ISO 100 has really fine grain, but due to that there's less photons hitting each individual grain so if there's little light it takes a long time for the grains to be hit enough to become visible. ISO 400 has bigger grains, so there's more photons hitting each grain but that makes it have more grain and more noise because it's a bigger chance of stray photons hitting it and the grains are just more visible.