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<blockquote data-quote="DTigga" data-source="post: 116675" data-attributes="member: 12060">Fx and dx refer to the sensor size in your camera.Fx=full frame sensor (same size as a&nbsp; traditional 35mm film)Dx=crop sensor (smaller sensor, used in your D5100)As for lenses, anything labeled as AF-S will auto focus on a D5100.&nbsp; All other Nikon lenses will work in manual mode.The numbers tell you how much of your subject you will fit in the frame.50 is considered a baseline as it is basically the scene as it would appear without any lens. Anything under 50 that is considered a wide angle lens, whilst over that is a zoom lens.&nbsp; Some lenses have two numbers. This means the lens has a focal range between these numbers.Note: because you have a Dx sensor on your camera, the numbers will need to be multiplied by 1.5 when working out your focal range. This means 35 is now your baseline. I'm sure there are plenty more thorough explanations online you can find but this should be enough to get you started.</blockquote>

[QUOTE="DTigga, post: 116675, member: 12060"] Fx and dx refer to the sensor size in your camera. Fx=full frame sensor (same size as a traditional 35mm film) Dx=crop sensor (smaller sensor, used in your D5100) As for lenses, anything labeled as AF-S will auto focus on a D5100. All other Nikon lenses will work in manual mode. The numbers tell you how much of your subject you will fit in the frame. 50 is considered a baseline as it is basically the scene as it would appear without any lens. Anything under 50 that is considered a wide angle lens, whilst over that is a zoom lens. Some lenses have two numbers. This means the lens has a focal range between these numbers. Note: because you have a Dx sensor on your camera, the numbers will need to be multiplied by 1.5 when working out your focal range. This means 35 is now your baseline. I'm sure there are plenty more thorough explanations online you can find but this should be enough to get you started. [/QUOTE]

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