Question Do yo need 1.4 converter

[ghamden]

I have been reading some of the post and i have a question with a 20d and a 70/200 f4 L
the lens is acctually approx. 112/320 so my question is by adding a 1.4 to the lens does this increase it to 156/448 and is it worth the cost.

[Andrew Pratt]

That depends on what you want to shoot? For wildlife IMO yes the TC would be a big help...and even then it'll be shorter then you'd like.

[MDJAK]

I have the 70-200f2.8 on which I sometimes use a teleconverter, usually when shooting outdoor sports. My 1dsmkII has no crop factor though and so it becomes a 280 at the long end.

Keep in mind that the crop factor is often misunderstood. While it is cropping the field of view as a longer lens would, it is not bringing you closer as a longer lens would. Also, with the F4, it becomes F5.6, I believe, and is that much slower in both focusing and the amount of light it allows in.

[GyRob]

the 1.4 is a nice pice of kit but it will add a little softness to any lens you put it on .
Rob.

[jfrancho]

I have the 70-200f2.8 on which I sometimes use a teleconverter, usually when shooting outdoor sports. My 1dsmkII has no crop factor though and so it becomes a 280 at the long end.

Keep in mind that the crop factor is often misunderstood. While it is cropping the field of view as a longer lens would, it is not bringing you closer as a longer lens would. Also, with the F4, it becomes F5.6, I believe, and is that much slower in both focusing and the amount of light it allows in.Try to refrain from using the "c - phrase" or else this will become a ten page post....

[lomond]

the 1.4 is a nice pice of kit but it will add a little softness to any lens you put it on .
Rob.

I agree that it must impact on the quality of the image, however, it's very difficult to see the difference on the 300f4 I tend to use it with. In fact I think it's so good it's hardly ever off this lens.
As a downside the focus can be a little slow in low light due to the one stop of light that is lost.
I wouldn't hesitate to recommend this TC for any Canon lens faster than f5.6 that is compatible with it.

Agree with the c*** factor comment.

[wibbly]

So if I compare:

A) No 1.4x = faster lens 'combination', faster shutter speed for given required DOF = sharper image, and I can crop it by 1.4x to get the same effect as using the 1.4x but end up with less pixels in the image..., and

B) 1.4x = still get 8MP images that might be less sharp because the lost light made me take at a slower speed, and marginal loss of sharpness through the use of the extra glass...

Price apart, using the 1.4x is the better compromise in general??

John

[jfrancho]

So if I compare:

A) No 1.4x = faster lens 'combination', faster shutter speed for given required DOF = sharper image, and I can crop it by 1.4x to get the same effect as using the 1.4x but end up with less pixels in the image..., and

B) 1.4x = still get 8MP images that might be less sharp because the lost light made me take at a slower speed, and marginal loss of sharpness through the use of the extra glass...

Price apart, using the 1.4x is the better compromise in general??

JohnThese would be the same questions you would ask yourself when deciding focal range anyway. Right? I mean the same comprimise would be made between say a 50mm and 85mm; or even a zoom without a fixed aperture throughout it's focal range. I guess I'd say that would have to be up to you.