Fast lens needed
 

HI there Guys,

i am a photographer in swansea, looking for a new lens which is fast on the auto focus at the moment got a sigma 28-300 and a tamron 28-300 vr di which cost about £500 but its auto focus is rubbish at the high end of the zoom looking for a 50/70- 250/300 its just got to be fast.

thanks nik

to fit what camera???

Sorry that would have been a useful point

a canon 5d and a 5d 2

thanks
nik

My first thought would be the Canon 70-200 f4 - it's a superb lens, very fast AF and amazing image quality.

HI there is mthis the one?

http://www.camerabox.co.uk/product1....FZJr4wodHWCbeQ


thanks NIK

Looks like it to me, lovely bit of glass. If you feel like spending a bit more :D Canon do an IS version too.

Just a note: 'fast' when talking about lenses refers to the maximum aperture, so-called because a wide aperture will let you use a faster shutter speed. So a fast lens may be f1.4, but a slow one f3.5. Depends on focal length as well, longer lenses tend to be slower.

HI there Guys,

i shoot a lot of multi pose in nurseries and the sort of stuff that sells at the moment are a combination of close crops and full bodies.

I need to be able to zoom from one to another quickily and the auto focus i have on my lens is rubbish sometimes its going in and out and the shot is lost especially when in low light conditions.

I use a 5d 1 and 2.

Please forgive my ignorance and lack of knowledge as far as lenses are concerned i just want the lens to focus quickily.

Have i understood this correctly if the lens is a 1.4 for exaqmple and i am shooting at f8 will the lens still work quickily?

Nik

The aperture makes no difference to the speed of the autofocus. The AF is on the camera, so if it's going in and out it's the camera's fault. If that happens override it manually, at small apertures you will get a good enough DoF for the subject to be in focus.

Alex,

The aperture makes a huge difference in low light. When I went to Focus on Imaging a few years ago, and was doing some research on Sigma long lenses for Lello I had major problems with focus hunting on some of their long zooms. Test were in the exhibition hall lights. On the Nikon stand Foxy and I had a play with some Nikon excotica (fast lenses but same light) and the difference was incredible.

Don