What's the diffrents between these two 50mm lens?
I want to buy a 50mm lens for my girlfriend nikon camera but i don't know what the diffrents between these two 50mm lens i'm a canon user so i do not know alot about nikon stuff so can you please help.
The AF-S lens is faster auto-focusing and is the one you need to buy her if she has an entry level Nikon dSLR.
Since you failed to mention the model camera she has, we can't tell you which you need to buy her
Generally if her camera cost more that $1, 000, you can buy her the AF lens, otherwise you will need to buy the AF-S model lens
The 50mm F1.8G (2nd one) has a focus motor built into the lens. If your girlfriend has one of the entry level Nikon DSLR's like the D3200 or D5200 then this is the one she needs. The other one will only autofocus on the D90 or D7000 and up since they have a focus motor built into the camera body.
All Nikor lenses mount on all recent (last 30+ years) Nikon cameras.
But in the digital world, not all Nikor lenses are equal.
Lenses with a "G" designation were designed specifically for the 'entry' level Nikons - D3000, D3100, D5000, D5100, etc. They differ in two respects from other Nikor lenses.
First, the autofocus drive motor is in the lens rather than the camera body. That means that the camera body is a bit less expensive and lighter in weight, but that savings is offset by a slight increase in lens weight and price. But since entry-level cameras are most often sold in kits, the purchaser never sees that difference. But purchasers of more expensive 'professional' cameras end up paying a bit less for their additional lenses, and their overall camera bag weight is a bit less.
Second, the "G" stands for 'gelded' and means that something has been removed from the lens. Specifically, G lenses do not have aperture rings, and instead, the photographer is required to use the automation settings in the camera to adjust aperture. In practice, that's OK, but where it matters is that G lenses can't be used on camera bodies that do not provide the automation required to set the aperture. So a G lens will work just fine on a modern DSLR, but it won't work on an older Nikon camera even through the lens can physically mount on the camera.