Ok, 70-200 II f2.8 lens with the 2x Extender renders the f2.8: f3.5? Is that correct?
284457
Unfortunately no, you have even to multiply the f stop by 2x, so the 2.8 will be 5.6, is that what you asked for?
2207206
It just so happens that yesterday I tried the 2.0 on my 7D Mark II with the new 100-400 II lens and it lost its AF function. It works fine with the 1.4 extender, though.
1588425
Because Canon dSLR cameras are unable to auto focus if the f-number is greater than f5.6. So, if you have a lens that's f4 and you use the 1.4 extender, then the result is f5.6 and auto focus still work. If you have the same lens that's f4 and you use the 2x extender, then the result is now f8 and auto focus will not work. The only time this is not true is if you're using the Canon 1DX camera body but since most people use the 5DMII or 5DMIII or the crop-sensor bodies, and lenses that typically have f4 in the lens (as do most Canon zooms), then the 1.4 extender is the best solution. I can say that on my 5DMII with my 300mm f4 L lens, the 1.4 extender is a perfect match (and it works perfectly with my 135mm f2 L lens as well).
595976
I haven't owned this lens for very long but I've had very good results with it so far. I mainly shoot with automatic settings and the camera adjusts the aperture for each picture of course. It is not always on f/2.8. It varies, depending on the light conditions, etc. if you shoot manually you can keep it on f/2.8 if you want. That is simply the largest aperture setting you can use on this lens. You CAN change it to a smaller aperture if you want.
1264742
Neither the Canon EF Extender 1.4x or 2x will work with that lens. They work only with L primes of 135mm and longer, and the 70-200mm and 100-400mm zooms. The Extenders will not mount the 24-70mm f/2.8L, are you could damage the lens by trying. There are extenders from other companies such as Sigma and Tamron that may work with the 24-70mm f/2.8L, but you may find the image quality disappointing.
182582
It is 2.8 at 50mm and 3.5 at 200.The scale is fairly linear - it is about f3.0 at 135mmSharpest at f4 and still quite sharp wide open.
260831
I don't know. I love my lens. Haven't had any problems with it. Wish i could buy a stronger one than 200mm. Sherry
1789853
Your aperture is a standard no matter what camera you use. 2.8 is 2.8, regardless of focal length. Technically, your depth of field doesn't change either actually. The 2X crop factor means you need to stand twice as far away to get the same Field of view compared to a 35mm equivalent (full frame), which is why your depth of field will be less. Another way of putting it is that you'll get the depth of field of a 25mm lens with a 50mm equivalent.Also, know that if you're looking for a shallow depth of field with great bokeh, this is the only lens you should be considering. It's spectacular. Your aperture is a standard no matter what camera you use. 2.8 is 2.8, regardless of focal length. Technically, your depth of field doesn't change either actually. The 2X crop factor means you need to stand twice as far away to get the same Field of view compared to a 35mm equivalent (full frame), which is why your depth of field will be less. Another way of putting it is that you'll get the depth of field of a 25mm lens with a 50mm equivalent.Also, know that if you're looking for a shallow depth of field with great bokeh, this is the only lens you should be considering. It's... » Read More Your aperture is a standard no matter what camera you use. 2.8 is 2.8, regardless of focal length. Technically, your depth of field doesn't change either actually. The 2X crop factor means you need to stand twice as far away to get the same Field of view compared to a 35mm equivalent (full frame), which is why your depth of field will be less. Another way of putting it is that you'll get the depth of field of a 25mm lens with a 50mm equivalent.Also, know that if you're looking for a shallow depth of field with great bokeh, this is the only lens you should be considering. It's spectacular. « Show Less
1783065
Hi this canon 100-400 is f4.5-5.6 while the 70-200 is f2.8. These two lenses are totally different.
1163548
Uff... to much i will said... this are one of the finest cheapers lenses that you will find, the one thing that you must have in mind is that this is a f1.8 so that allows to get a lot more light meanwhile the 18-55 is a 3.5 and that my friend on the DLSR world is a big diference.
2130770
Concur with Rich Maher's comments. However when I use it with my Tamron 18-270 zoom I find that I need to use manual focus as it gets a little "confused" with the extender.
811134
while i have never had the 70-200, i've had other canon lenses, including the red strip 24-105 4L, and other tamron lenses...from my experience this 24-70 will be as sharp or sharper than them all...tho, like all lenses, you should not shoot at full open 2.8 for best sharpness...i shoot at 3.2, and with the image stab i is no problem...and fully open to 24mm the outer portion may be less sharp, but that holds for all wide angle zooms...this is as good as the best, it is among the best.
678610
I had the f4 version, and sold it to a friend to buy the F2.8II. Frankly, the increase in IQ is there but very slight. I would have no qualms about going back to the F4 version, it's a stunning lens. So unless you have a specific need for F2.8 (weddings for example as others mention), the added weight of the 2.8 to me is hard to justify. These are both exceptional lenses, the difference is like comparing a Bentley and a Rolls-Royce.
2043803
The main difference appears to be the aperture. The f/2.8 will work better in lower light giving you at least an extra stop of light to play with. This means shorter exposures in lower light than the f/4-5.6.
2204555
The f/# changes as you zoom the lens. At 24mm it is f/2.8, at 85mm it is f/4.0.
1049129
Yet it is. I use a Nikon D2x with a AF-S Nikkor 70-200mm 1.2.8 lens without any problem.
2022116
The teleconverter works best with F2.8 lenses. AF may not work well at higher F stops and you may need to go to Manual focus