This is an example thread and not a question thread. One of the problems with shooting in low light is the relatively long shutter speeds that can be required. "Faster" lenses with larger maximum apertures are designed to offset this. Many people shoot in "aperture priority" mode, which allows you to set the aperture (in this case wide-open) while allowing the camera to pick the two other elements of the digital exposure triad--shutter speed and ISO. Even with fast f/1.4 lenses, if the light is really low you can find yourself with longish exposure times at max acceptable ISO. The results if shooting handheld are blurry images. VR lenses or some camera bodies can overcome blur caused by camera shake, but they can't fix blur caused by subject motion at slow shutter speeds. Manual mode is often avoided by many people. But in low-light situations it can be very helpful. The following were all shot during the day, so I specifically adjusted the exposure to mimic shutter speeds that are common when shooting in low-light. Manual focus which was constant between the two shots. ISO 200, f/8, 1/6th second. This was taken in aperture priority mode with the ISO set at 200. The camera determined a proper exposure of 1/6th second. This resulted in significant blur from camera shake. ISO 200, f/8, 1/30th second. This was taken in manual mode by setting the shutter speed at the minimum I considered acceptable to prevent camera shake hand-held. Since I kept everything else constant, it is clearly underexposed. Above image with exposure boosted in LR by 2 1/3 stops. Not sure how obvious this is with the small internet images, but the last image is sharp as compared to the first image which is extremely blurry. Shooting in RAW allowed me to correct the exposure in post. Given the choice between a properly exposed but blurry image vs an underexposed but sharp image, I would choose the latter for most subjects. Most cameras will allow for ISO to be automatically adjusted even in manual mode. So you are kind of getting an auto-mode while still preventing blur from slow shutter speeds. Alternatively could just shoot in shutter priority mode and let the camera adjust aperture and ISO to compensate for the scene.