I'm a new owner of the Nikon D5100 and also own the 55-300mm lens and 18-55mm lens. I love this set up a lot and I am totally enjoying myself. However, I like to take shots of birds and wildlife while hiking and I am finding that the 300mm just doesn't seem to be enough.
I saw some Kingfisher birds and the pictures are relatively clear using the 300mm, but I have to crop to get it larger. When I do this I lose some clarity.
So now I am looking for a 500mm lens. The Nikon lens is just way out of my budget range so I have been looking at Amazon for different options. I noticed someone was selling the Vivitar 500mm mirror lens and a 2x teleconverter lens with a D5100 as a package. The Vivitar 500mm lens (without the camera) was about $200.
I also was looking into a Sigma 100-500mm lens, priced around $1,100. I was wondering if you could give me your insight on what option would be better.
Also if you have any helpful hints on using what I have to get better photos with certain settings that would be great...which truth be told I am not all that familiar with.