I think 1/100th is a long way from 1/800th and not really the same situation - but clearly (!) I think if the light is low you need to use full manual or Apeture priority or risk suffering dark photos.
I'm just trying to pount out that Aperture mode lets your camera work properly always - Shutter priority doesn't as it's limited by the glass you're using, which is amplified if you're using slow glass.
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