Hi, I'm fairly new to photography and was just browsing ebay while on lunch and ended up at one stage looking at lens.

But why/what makes these lens so cheap?
Lens 1

Lens 2

I have been looking at spending something around the $700-$88 range for 105mm macro lens and $1400 for a 500mm lens as I want to Macro shots and nature shots (birds etc).

As I said I'm fairly new to photography, like just over 4 weeks ago I got the camera So be gently when calling me a idiot please

Thanks in advance for the answers as well