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Posts: 80
Registered: ‎02-12-2017

Re: New member needs help

I have the latest version of the Canon 100-400. I tried a Canon 1.4 extender and found that it needed more light and was slow to auto focus. The images were disappointing. I like B&H because they have a good return policy. I tried a Tamron 150-600 G2 but was disappounted in build quality and images.  I will buy only Canon products from now on. I will buy the Canon f/2.8 70-200. Thoughts?

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Re: New member needs help

"I will buy the Canon f/2.8 70-200. Thoughts?"

 

Yeah a few but the important one is, it is the best lens made.  Smiley Happy  I would not be without mine!

 

I agree with you on the 100-400 with the t-con but I don't on the 150-600mil G2.  It is a consumer lens.  No better no worse and on par with Canon consumer lenses or anybodies for that matter.

EOS 1DX and 1D Mk IV and several lenses!
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Re: New member needs help

I did not like the 1.4 extender on my 100-400. How about a 1.4 on a 70-200 for birds at 15-40 yards?

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Re: New member needs help


@lurechunker wrote:

I have the latest version of the Canon 100-400. I tried a Canon 1.4 extender and found that it needed more light and was slow to auto focus. The images were disappointing. 


You should give it more time to learn.  But, you knew going in that the extender would decrease the light and slow down the aperture.  You just didn't know much the impact on AF performance would be.  Didn't you have to climb a learnng curve with the 100-400mm before you were satisfied with the shots?

 

I think the 100-400mm with the 1.4x feels like it focus at least as fast as my Sigma 150-600 "C".  But, since the firmware upgrade to the Sigma, which was a complete rewrite of the AF, the Sigma is VASTLY improved in AF speed and image quality.

Curiously, I have never bothered to use the 1.4x with the 70-200mm, but I would expect the impact on aperture and AF speed to be similar to that of the 100-400mm.  I guess I must reach for the 100-400, instead of the using the 1.4x with the 70-20.

 

Seeing how the 70-200mm is perfect just the way it is, that might explain why I have never used the 1.4x with it.  When I do carry the 100-400mm, it has been on a crop sensor body, and the 70-200mm is on a full frame body.  


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"Doctor told me to get out and walk, so I bought a Canon."
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Posts: 5,484
Registered: ‎06-25-2014

Re: New member needs help


@Waddizzle wrote:

@lurechunker wrote:

I have the latest version of the Canon 100-400. I tried a Canon 1.4 extender and found that it needed more light and was slow to auto focus. The images were disappointing. 


You should give it more time to learn.  But, you knew going in that the extender would decrease the light and slow down the aperture.  You just didn't know much the impact on AF performance would be.  Didn't you have to climb a learnng curve with the 100-400mm before you were satisfied with the shots?

 

I think the 100-400mm with the 1.4x feels like it focus at least as fast as my Sigma 150-600 "C".  But, since the firmware upgrade to the Sigma, which was a complete rewrite of the AF, the Sigma is VASTLY improved in AF speed and image quality.

Curiously, I have never bothered to use the 1.4x with the 70-200mm, but I would expect the impact on aperture and AF speed to be similar to that of the 100-400mm.  I guess I must reach for the 100-400, instead of the using the 1.4x with the 70-20.

 

Seeing how the 70-200mm is perfect just the way it is, that might explain why I have never used the 1.4x with it.  When I do carry the 100-400mm, it has been on a crop sensor body, and the 70-200mm is on a full frame body.  


I have used a 1.4 extender on my 70-200 f/2.8, and it worked fine. The loss, if any, of image quality wasn't noticeable. Of course it turned the lens into an f/4, but that's no hardship outdoors. (And it takes a pretty big room before a 70-200 lens needs an extender indoors.)

 

The big difference in using the extender on the two lenses under discussion is that the 70-200 is a constant-aperture zoom and the 100-400 isn't. So it's possible that the extender could cause autofocus problems at the long end when used on the 100-400, but no such issues should occur with the 70-200.

Bob
Philadelphia, Pennsylvania USA
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Re: New member needs help


@RobertTheFat wrote:

I have used a 1.4 extender on my 70-200 f/2.8, and it worked fine. The loss, if any, of image quality wasn't noticeable. Of course it turned the lens into an f/4, but that's no hardship outdoors. (And it takes a pretty big room before a 70-200 lens needs an extender indoors.)

 

The big difference in using the extender on the two lenses under discussion is that the 70-200 is a constant-aperture zoom and the 100-400 isn't. So it's possible that the extender could cause autofocus problems at the long end when used on the 100-400, but no such issues should occur with the 70-200.


If he is having AF problems, then it could related to the selection of AF points and/or AF assist points.  Not every AF point would be functional with extender at maximum zoom.  

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"Doctor told me to get out and walk, so I bought a Canon."
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Esteemed Contributor
Posts: 3,834
Registered: ‎06-11-2013

Re: New member needs help

I seem to recall that Canon deliberately slows the AF speed when the notice the extender is being used.  A slower AF speed is fairly normal.  There were a few reasons why it was a good idea to do that... I do not recall specifically what they were.

 

Tim Campbell
5D III, 5D IV, 60Da
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Posts: 80
Registered: ‎02-12-2017

Re: New member needs help

Should I expect good images on birds at 40 yards with the 2.8 70-200 on my 80D? I crop images but do no other editing.

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Re: New member needs help


@lurechunker wrote:

Should I expect good images on birds at 40 yards with the 2.8 70-200 on my 80D? I crop images but do no other editing.


What size of brids?  Why should you NOT expect good images?  I suppose how fast birds are moving about, and what direction, might present a challenge to the AF system.  

 

EOS 6D201704118007.jpgLR_Cropping.JPG

At that distance, why not use the supertelephoto zoom?  BTW, Lightroom reports the distance to the subjects in the above photos as being between 30 meters and infinity.  My foggy recollection is that they were around 40-50 yeards.

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"Doctor told me to get out and walk, so I bought a Canon."
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Re: New member needs help

"Should I expect good images on birds at 40 yards with the 2.8 70-200 on my 80D?"

 

Any photo from the Canon EF 70-200mm f/2.8L IS II USM Lens will be good.  However if you are referring to the size of the bird in the shot from 40 yards, it depends on what bird.  An ostrich will be pretty nice a chickadee will be tiny.  No reasonable lens made will make a tiny bird large in a photo at 40 yards.

I use 400mm to 600mm on tiny birds and try to be not more ths 25 (less than 10 yards) feet from them.  The closer the better.

bird.jpg

This is from a 500mm lens at approx. 20 feet for example.

EOS 1DX and 1D Mk IV and several lenses!
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