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Message: <blockquote data-quote="nickt" data-source="post: 685655" data-attributes="member: 4923">This might help you and @<a href="https://nikonites.com/member-45802-bluegrassman.html" target="_blank">bluegrassman</a> ....Back in film days, A and S were a great advancement. Less 'wow' for me now . That's just me though, certainly they are still popular tools. I still use them under many conditions. The problem I have is they take a little more awareness than I sometimes have. Assuming a fixed iso, you run the risk of hitting a wall in Shutter priority. As the light dims, your aperture will open, eventually hitting its lower limit. If you miss the warning, you will start under exposing as the light lessens.Now for Aperture priority... again assuming a fixed iso, you have virtually no limit on the shutter speed the camera will choose. As the light dims, the shutter will slow. No warnings. If you are shooting at f8 in dimmer light, you can quickly find yourself with a shutter speed too slow for hand holding.Auto iso can help with both of these conditions. Especially if you set a minimum shutter speed with the auto iso. On the other hand, there are times when auto iso is a terrible idea. Sunsets for instance.My everyday mode for my big lens is manual mode with auto iso. I lock in 1/800, my safe handheld speed for 600mm and I lock in f7.1 (one stop up from wide open for better sharpness). Shooting this way, I am very 'automatic', yet I have tight control on my handheld settings. I am at good settings for any light conditions. No surprises with blurry or dark pictures. Some folks put an upper limit on iso when shooting this way, I don't. I'll take a grainy shot over no shot.</blockquote>

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