Nikon D7500 Users Manual - English for customers in the Americas - Page 307
AAF-S/AF-I Teleconverters ALens f-number DRed-Eye Reduction, 105mm f/2.8G IF-ED. If TC-17E II, TC-20E
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A AF-S/AF-I Teleconverters If the combined aperture when the camera is used with an AF-S/AF-I teleconverter is slower than f/5.6 but is equal to or faster than f/8, autofocus and electronic rangefinding will be available only with the center focus point and the camera may be unable to focus on dark or low-contrast subjects. Single point AF is used when 3D-tracking or auto-area AF is selected for AF-area mode (0 103). Autofocus is not available if teleconverters are used with the AF-S VR Micro-Nikkor 105mm f/2.8G IF-ED. If TC-17E II, TC-20E, TC-20E II, or TC-20E III teleconverters are used with the AF-S NIKKOR 300mm f/4E PF ED VR, autofocus is available only in AF-S mode. A Lens f-number The f-number given in lens names is the maximum aperture of the lens. D Red-Eye Reduction Lenses that block the subject's view of the red-eye reduction lamp may interfere with red-eye reduction. 281