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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 02 Dec 2010 (Thursday) 10:56
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400 5.6 vs 300 2.8 + 1.4xtc ?

 
sandpiper
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Feb 25, 2014 07:03 |  #46

Kanye wrote in post #16715326 (external link)
Yeah, but it does with any 1D body...

Which is true, but a 1D has less reach than the 7D, which cuts out the benefit of using the TC anyway. This is especially so with any prior to the mkIV.




  
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Kanye
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Feb 25, 2014 22:52 |  #47

sandpiper wrote in post #16715748 (external link)
Which is true, but a 1D has less reach than the 7D, which cuts out the benefit of using the TC anyway. This is especially so with any prior to the mkIV.

1.3x crop factor + 1.4x TC + 400L = 728mm reach

vs

1.6x crop factor + 400L = 640mm reach

728mm - 640mm = 88mm

You gain 88mm focal reach with a 1D + 1.4x that AFs...




  
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dasher108
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Feb 26, 2014 10:28 |  #48

Quack Me Up wrote in post #16702709 (external link)
Let's open up this old thread. I have a 7D and a 400L 5.6 now. I'm wondering the same thing as the original person. For those of you who have used the 300 2.8 IS with a 1.4 extender have you noticed any focus tracking problems for BIF? Wondering if it'll track as good as or better than the 400 5.6 without an extender?

Thread re-visited using 7D as the basis for lens options.

Kanye wrote in post #16715326 (external link)
Yeah, but it does with any 1D body...

This does not really address users question of lens and 7D.


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Doctor ­ Mabuse
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Feb 26, 2014 10:33 |  #49

speters2 wrote in post #11482701 (external link)
I thought I should mention that you can indeed retain Af with the 400mm/5.6L + 1.4, if you use the one Kenko makes

Confirmed. AF working here with a 550D.




  
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hollis_f
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Feb 26, 2014 11:11 |  #50

Doctor Mabuse wrote in post #16719151 (external link)
Confirmed. AF working here with a 550D.

'Working' as in 'still great for birds in flight' or 'working' as in 'will attempt to focus on slow-moving things in good light'?


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Owl_79
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Feb 27, 2014 08:14 |  #51

Using smaller aperture lenses on f/5.6 AF body, causes that some parts of AF sensor (actual, selected AF point) remains dark, thus AF CPU gets confused. This is the reason for hunging AF if you put f/8 lens for a body that has f/5.6 AF sensor. Not that f/8 passes less light than f/5.6, it has nothing to do with that (as example, f/5.6 lens focuses in quite dark situations while f/8 will not even in direct sunlight!).

Canon 1D body has special, physically different (smaller) center AF point for f/8 lenses.


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gocolts
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Feb 27, 2014 09:02 |  #52

hollis_f wrote in post #16719264 (external link)
'Working' as in 'still great for birds in flight' or 'working' as in 'will attempt to focus on slow-moving things in good light'?

This is true. I used the 400L + 1.4TC combo for racecars and bikes, worked ok, but birds would be tough.

If one is determined to get out near 600mm with a 7D on a $1k budget, I'd go for the new Tamron 150-600 and deal with the quirky AF servo 7D owners are noting (including me) over the 1.4 TC taping trick. I've tried/owned both, and I think the Tamron is going to be a better bet.

Granted- my old 400 DO with 1.4TC was the best combo, but I simply don't need 500+mm enough to justify such an expensive lens for it, even if it was a great combo.




  
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Feb 27, 2014 09:18 as a reply to  @ gocolts's post |  #53

Does anyone know if the 5d MarkIII will autofocus using the 400/5.6 and 1.4x teleconverter combo?


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amfoto1
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Feb 27, 2014 09:31 |  #54

Scud49 wrote in post #16721518 (external link)
Does anyone know if the 5d MarkIII will autofocus using the 400/5.6 and 1.4x teleconverter combo?

Yes, it will... So long as the latest firmware is insalled and limited to some of the central AF points.

Re-poster with the 7D and 400/5.6... I have 300/2.8 IS and 1.4X II and use them on 7D. Focus is not a concern. It's plenty fast with or without the TC.

The problem is as others have stated. For BIF specifically, I think "handheld" and the 300/2.8 IS is not a lens I'd want to handhold for very long.

Normally I instead use 300/4 IS for handheld work (also with 1.4X II, and it's plenty fast focusing).

If, on the other hand, you will be working on a monopod or tripod, the 300/2.8 IS would be fine. But, besides IS and larger aperture, you won't be gaining a whole lot over the 400/5.6.


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Feb 27, 2014 09:46 |  #55

amfoto1 wrote in post #16721558 (external link)
Yes, it will... So long as the latest firmware is insalled and limited to some of the central AF points.

Re-poster with the 7D and 400/5.6... I have 300/2.8 IS and 1.4X II and use them on 7D. Focus is not a concern. It's plenty fast with or without the TC.

The problem is as others have stated. For BIF specifically, I think "handheld" and the 300/2.8 IS is not a lens I'd want to handhold for very long.

Normally I instead use 300/4 IS for handheld work (also with 1.4X II, and it's plenty fast focusing).

If, on the other hand, you will be working on a monopod or tripod, the 300/2.8 IS would be fine. But, besides IS and larger aperture, you won't be gaining a whole lot over the 400/5.6.

So, 5D3 has f/8.0 focusing point(s) that can be activated by firmware update? f/5.6 sensitive sensor will not work well with f/8 lens.. it's unaccurate and hunting.


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Feb 27, 2014 09:47 |  #56

amfoto1 wrote in post #16721558 (external link)
Re-poster with the 7D and 400/5.6... I have 300/2.8 IS and 1.4X II and use them on 7D. Focus is not a concern. It's plenty fast with or without the TC

Yes, but a 420mm f4 (300 f2.8 + 1.4xTC) is a hugely different proposition to a 560mm f8 (400 f5.6 + 1.4xTC).

amfoto1 wrote in post #16721558 (external link)
The problem is as others have stated. For BIF specifically, I think "handheld" and the 300/2.8 IS is not a lens I'd want to handhold for very long.

Hmmm, I'm a retired gent with arthritis in my wrists. Yet I'll carry the 300 around all day and shoot it handheld. It's one of the reasons I bought it.

amfoto1 wrote in post #16721558 (external link)
If, on the other hand, you will be working on a monopod or tripod, the 300/2.8 IS would be fine. But, besides IS and larger aperture, you won't be gaining a whole lot over the 400/5.6.

Apart from IS and a larger aperture I'm not sure what else I would want to gain.


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Feb 27, 2014 12:14 |  #57

amfoto1 wrote in post #16721558 (external link)
Yes, it will... So long as the latest firmware is insalled and limited to some of the central AF points.

Thanks Amfoto - I do have the latest firmware installed.


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Feb 27, 2014 14:13 as a reply to  @ Scud49's post |  #58

Just another option to throw in. If the 300 2.8 is an option cost wise, than maybe take a look at a used 400 f/4 DO. Mine is very sharp and takes a 1.4x tc well too.

It works great handheld, has IS, and the lens weighs only 4.3 lbs. On a 7d without a grip, it's surprisingly light. Just a thought..:)


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Quack ­ Me ­ Up
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Feb 27, 2014 20:25 |  #59

Thanks for all the input everyone. I guess my 300 2.8 inquiry is mostly aimed at possibly filling in a gap in my lens lineup. I figured the 300 2.8 w/o an extender will give me 480mm and with a 1.4 extender I'd get 672mm at F4 compared to 640 5.6 with the 400 lens. I thought if the 300 will give me equal to or better image quality than the 400 across the board then I'd also have the straight up 300 to use as well. I have a 70-200 2.8 IS ii and a 600F4 on either side of my 400 now.




  
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Quack ­ Me ­ Up
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Feb 27, 2014 20:29 |  #60

If it makes any difference, If I do buy a 300 it'll be the version 1 IS.




  
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400 5.6 vs 300 2.8 + 1.4xtc ?
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