Good lens for nikon d5000?

Camera lens

The custom Zeiss apo sonnar 1700mm lens

I need more info than that to give you an actual answer.

Nikon's 24-70 f2.8

Http://www.bhphotovideo.com/c/product/551436-REG/Sigma_597306_200_500mm_f_2_8_EX_DG.html

I would consider Nikon 70-300mm f/4-5.6G AF Nikkor SLR Camera Lens

Compact and lightweight, this 4.3x autofocus zoom lens is ideal for candid shots, portraits, travel and sports photography
Count on genuine Nikon optics for outstanding picture quality
This is a G designated lens, not ED series - Nikon Part #1928
Accepts 62mm filters (see sidebar)