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<blockquote data-quote="BF Hammer" data-source="post: 827099" data-attributes="member: 48483">It is overwhelming when starting. Nikon F mount evolved over decades to accommodate new tech and at least try for backwards compatibility. Did not always work that way.DX means a sensor that is smaller than the full-frame of 35mm film. For cost and technology reasons all DSLR makers began with DX &quot;crop-sensor&quot; cameras on the market. What that means for you is that you are not limited to exclusively DX lenses, full-frame projects an image that covers your sensor fully. Me using a full-frame camera, I do have to pass over those less expensive DX lenses.AI and AIS is electronic communication between lens and camera. Looking at vintage lenses, you really need to stick to the compatibility list in the camera manual.AF-S, AF-P, AF D, this is generational series basically. I believe a D7500 has the autofocus motor in camera body required to use D lenses. Old tech. The AF-S has motor inside lens. That really is much better as the D lenses are slower and make loud noises when focusing. Actually I do not know what AF-P is about either. But the compatibility chart in your manual won't steer you wrong.</blockquote>

[QUOTE="BF Hammer, post: 827099, member: 48483"] It is overwhelming when starting. Nikon F mount evolved over decades to accommodate new tech and at least try for backwards compatibility. Did not always work that way. DX means a sensor that is smaller than the full-frame of 35mm film. For cost and technology reasons all DSLR makers began with DX "crop-sensor" cameras on the market. What that means for you is that you are not limited to exclusively DX lenses, full-frame projects an image that covers your sensor fully. Me using a full-frame camera, I do have to pass over those less expensive DX lenses. AI and AIS is electronic communication between lens and camera. Looking at vintage lenses, you really need to stick to the compatibility list in the camera manual. AF-S, AF-P, AF D, this is generational series basically. I believe a D7500 has the autofocus motor in camera body required to use D lenses. Old tech. The AF-S has motor inside lens. That really is much better as the D lenses are slower and make loud noises when focusing. Actually I do not know what AF-P is about either. But the compatibility chart in your manual won't steer you wrong. [/QUOTE]

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