EF 17-40 f4 + 1x4 teleconvertor

[click1808]

Hi I'm a newbie to this ,but i would like to ask can i use a 1x4 conv with this lens or should i just buy a lens equivalent
Thanks

[gemmf]

Personally I can see a point in making it a 24-56mm f5.6 lens. I think you'd be better off buying a different lens.

[philway]

The answer is simply here : http://www.usa.canon.com/consumer/contr ... delid=7462

[gemmf]

The answer is simply here : http://www.usa.canon.com/consumer/contr ... delid=7462

Not that simple, I'm afraid. It's true that you can only physically attach the Canon extender on certain Canon lenses, but there are ways of getting around to it (e.g. I use an extension tube for my 100mm macro), and teleconverters of other makes can be put on those Canon lenses. So you can use a converter on almost any lenses. I was just talking in more practical sense.

[philway]

With an extension tube, the focus to infinite is lost and I don't think the Canon 17-40 f/4L USM becoming a good macro lens.

Another link about EF extender specifications : http://www.usa.canon.com/app/pdf/lens/L ... rt_new.pdf

[sheila]

IMHO, TCs should not be used as a substitute for another lens. I have the Sigma 1.4x which I rarely use but when I do, I lose sharpness, even with good Canon glass.

Cheers
Sheila

[click1808]

I here what ya saying ,thanks y'all i'll be getting a 24 -70 f2-8
l8r
be cool