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<blockquote data-quote="Child" data-source="post: 847551" data-attributes="member: 71081">I purchased a <a href="https://www.adorama.com/used-nikon-50mm-f-18g-af-s-autofocus-lens/p/us2084431" target="_blank">Nikon 50mm f/1.8G AF-S Autofocus Lens</a> from Adorama in &quot;used but excellent condition&quot; this month for my D5100. I have previously only used kit lenses. I generally shoot in manual mode (as opposed to A, S, P, or Auto) and in manual focus (as opposed to AF-C, AF-S, or AF-A) with the lens switched to M/A (not M) on my kit lenses. This allows me to choose a point for the camera to focus on, and let the lens focus in automatically on my assigned point. I've got bad vision and can't trust my eye to focus tight enough.But those settings don't work with this prime lens. Even with the lens in M/A mode, the lens will not auto-focus as long as the camera is set to Manual Focus mode (MF) - I have to manually adjust with the lens ring. The lens will happily auto-adjust if I'm in any of the AF modes, so I know the auto setting is working.Is this just how the lens is built? Is there a setting I can change to allow me to focus manually and adjust the lens automatically? Or is the lens defective? Ultimately, should I buy a different lens? Thanks guys!Mckenna</blockquote>

[QUOTE="Child, post: 847551, member: 71081"] I purchased a [URL='https://www.adorama.com/used-nikon-50mm-f-18g-af-s-autofocus-lens/p/us2084431']Nikon 50mm f/1.8G AF-S Autofocus Lens[/URL] from Adorama in "used but excellent condition" this month for my D5100. I have previously only used kit lenses. I generally shoot in manual mode (as opposed to A, S, P, or Auto) and in manual focus (as opposed to AF-C, AF-S, or AF-A) with the lens switched to M/A (not M) on my kit lenses. This allows me to choose a point for the camera to focus on, and let the lens focus in automatically on my assigned point. I've got bad vision and can't trust my eye to focus tight enough. But those settings don't work with this prime lens. Even with the lens in M/A mode, the lens will not auto-focus as long as the camera is set to Manual Focus mode (MF) - I have to manually adjust with the lens ring. The lens will happily auto-adjust if I'm in any of the AF modes, so I know the auto setting is working. Is this just how the lens is built? Is there a setting I can change to allow me to focus manually and adjust the lens automatically? Or is the lens defective? Ultimately, should I buy a different lens? Thanks guys! Mckenna [/QUOTE]

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