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Advice requested re Canon 1.4 extender

[ Edited ]

I already had a Canon 1.4x mark I extender when I recently bought a Canon 100-400 L II lens. The mark I extender seems to work fine with it but should I spring for a mark III extender for this lens? I had been using the mark 1 extender with the similar-vintage Canon 300mm f4 L. Cameras are EOS R and 90D and I shoot mostly butterflies, bees, and smaller nature--not many birds. Thanks.

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Re: Advice requested re Canon 1.4 extender

[ Edited ]

If 90D has the same AF module as 80D has, then x1.4 III will give you more usable AF points than x1.4 or 1.4 II. Check page 135 in the 80D manual. From 1 point to 9 points.

You can try yourself right now with x1.4 and 100-400 II and check how many AF points you are able to use.

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Re: Advice requested re Canon 1.4 extender


@Wandalynn wrote:

I already had a Canon 1.4x mark I extender when I recently bought a Canon 100-400 L II lens. The mark I extender seems to work fine with it but should I spring for a mark III extender for this lens? I had been using the mark 1 extender with the similar-vintage Canon 300mm f4 L. Cameras are EOS R and 90D and I shoot mostly butterflies, bees, and smaller nature--not many birds. Thanks.


The 6D Mark II has the same AF system as both the 80D and 90D, or at least seems to.  You get 27 f/8 AF points, three rows of 9 AF points, with the 1.4x III and the 100-400mm Mark II.

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Re: Advice requested re Canon 1.4 extender

" I had been using the mark 1 extender with the similar-vintage Canon 300mm f4 L."

 

This is one of the few lenses I recommend using a 1.4x tele-con.  It works very well. Personal experience with both since I own both.  As a general rule I am not a great fan of extenders. My friends tell me the new 100-400mm zoom is also a good working combo. I can't say personally since I have neither the Mk III tel-con nor the new 100-400mm zoom. However, form what I am told it is worth getting the Mk III extender for the new zoom.

 

I very much prefer native FL. IMHO, a super zoom like one of the 150-600mm lenses is a better choice. Again though, you have the Mk II version 100-400mm so I would go for the new Mk III 1.4x tel con. AF points is not the only benefit here.

EB
EOS 1DX and 1D Mk IV and several lenses!
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Re: Advice requested re Canon 1.4 extender

Optically, I really don't think you are going to be able to tell a difference with most combinations between your original and the latest version.  If you didn't have an extender and wanted one, then getting the newest one makes sense but I wouldn't move to the newer version from what you current are using.

 

An extender is always going to reduce the image quality of the native lens, with a really good lens that can be acceptable.  But with the current high pixel count sensors, in many cases cropping is going to work as well or better.  If the lost f stop from the extender forces you to an exposure triangle where the ISO is set more than a stop or two from native then the quality may be lower from the combination than cropped.  The other option with the extender is dropping shutter speed to compensate but again the loss due to motion blur may exceed any gain from the extra 40% increase in image "fill" of the sensor.

 

I have taken a lot of test images with my EF 300 and 400 f2.8 lens with a 1.4X in place and I shot one soccer game with the EF 300 1.4X combo while my EF 400 was in for a checkup.  The images are very nice because the bare glass is so good but even with these the loss between bare glass and using an extender is obvious.  If you consistently need an extender on a lens, then you really need longer glass instead of a newer extender.

 

Rodger

EOS 1DX M3, 1DX M2, 1DX, 5DS R, 1D M2, EOS 650 (film), many lenses, XF400 video
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Re: Advice requested re Canon 1.4 extender

I use the 1.4x mk III extender with the new 100-400 zoom lens on occasion and found the focus not quite satisfactory until I removed a clear lens filter.  If I left the lens filter in place and removed the extender, the focus was sharp.  I'm interested in hearing others experience/knowledge with this topic.  

 

Just for fun,  I'm posting two images shot at 560mm (Canon 100-400 F4.5-5.6L IS USM Mark II + 1.4X Mark III Ext) with no clear uv protector.  I should have had a better shutter speed for the skydivers, as it was difficult tracking them as I had no warning when they would jump.  Cheers.. G

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Re: Advice requested re Canon 1.4 extender

[ Edited ]

@PhotoGerry wrote:

I use the 1.4x mk III extender with the new 100-400 zoom lens on occasion and found the focus not quite satisfactory until I removed a clear lens filter.  If I left the lens filter in place and removed the extender, the focus was sharp.  I'm interested in hearing others experience/knowledge with this topic.  

 

Just for fun,  I'm posting two images shot at 560mm (Canon 100-400 F4.5-5.6L IS USM Mark II + 1.4X Mark III Ext) with no clear uv protector.  I should have had a better shutter speed for the skydivers, as it was difficult tracking them as I had no warning when they would jump.  Cheers.. G

 

 


There is such thing as a "clear UV filter".  There are UV filters, which the lens does not like.  And, there are Clear filters, which do not seem to have any effect on lens performance.  I recommend B+W Nano Clear filters for any lens.  Never UV or CPL.

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Re: Advice requested re Canon 1.4 extender

"there are Clear filters, which do not seem to have any effect on lens performance."

 

Not my experience.  My first version 100-400mm Canon did not play well with any filter. I sold my ef 400mm f5.6L prime to buy the 100-400mm and later regretted it.  So I sold the 100-400mm zoom to buy another 400mm f5.6L. Live and learn.

 

EB
EOS 1DX and 1D Mk IV and several lenses!
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Re: Advice requested re Canon 1.4 extender


@ebiggs1 wrote:

"there are Clear filters, which do not seem to have any effect on lens performance."

 

Not my experience.  My first version 100-400mm Canon did not play well with any filter. I sold my ef 400mm f5.6L prime to buy the 100-400mm and later regretted it.  So I sold the 100-400mm zoom to buy another 400mm f5.6L. Live and learn.

 


Sounds like a good reason to simply remove the filter, and go without one.  If your images were still not to your liking, then the problem was the lens, not the filters.

 

I could not get sharp images with the 100-400mm II until I removed the UV filter, and set Image Priority to FOCUS.

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Re: Advice requested re Canon 1.4 extender

"Sounds like a good reason to simply remove the filter, and go without one"

 

The filter did not remain on it for long.  Two of my closer friends had the same lens and filter issues.  We all sold it and bought, in my case bought another, the 400mm f5.6L. Even without a filter the 100-400mm is not as sharp as the prime. Besides the first 100-400mm has additional problems not just not liking filters. It really soured me and probably why I never bought the current version of the 100-400mm which I am told is much better. No first hand experience with it.

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