Sigma 509944

Auto focus is fast. Lens is easy to use and easy to get used to. The quality is generally good.

Does have a softer focus at full zoom (but then again it's never going to be perfect as it is a relitivly cheap lens)

Ability to get really close to the action e.g. sport and wildlife

max aperture of 5.6 at 300mm end of zoom gives shutter speed of 1/60 sec. in our normal British sunshine

Weight, Comprable to Nikon in the way it works

not too keen on having to switch into macro mode manually

cheap

no autofocus with d40

get really close to the subject and great detail in image quality

lack of auto focus on at least the nixon version, means lots of fiddling about ,especially if like me you wear spectacles

its a good lens at the price of a cheap and nasty lens.

If I had to fault it the mat finish on main barrel is a bit coarse, but thats nit picking

Solid build

I found it difficult to focus accurately

work well whith my nickon

nil

really easy lens to use

a bit heavy

cheap. 70-300 zoom

not compatable with D40X. manual focus only.