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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 16 Jul 2014 (Wednesday) 13:11
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Modified EF-S 10-18 STM on 5D3

 
msowsun
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Jul 16, 2014 13:11 |  #1

I modified my EF-S 10-18 STM last night so it will mount on Full Frame cameras. This just involves unscrewing the plastic lens mount and cutting off the plastic part that extends too far into the mirror box area of the camera lens mount. I glued the pieces back together so that there is not a large opening in the back.

The mirror will hit at 10mm, vignettes badly at 10-13mm, but works jut fine at 14-18mm on a Full frame.

Today I was playing around with my 5D Mk III and have discovered a slight problem........

For some odd reason it will not do Phase Detection AF on my 5D3. It works fine in LiveView using Contrast detection AF. When I mount the lens, the "One Shot" message on the top LCD goes to "M Focus". When I switch to LiveView or Video, it goes to "One Shot", but as soon as I go back to using the viewfinder, it goes back to "M Focus". Not only will it not AF, but there is also no green dot focus confirmation in MF mode.

I also have a 18-135 STM that does the same thing when mounted on my 5D3. Both lenses work perfectly on my SL1/100D and also my old EOS 630 film camera. The EF 40mm STM also works perfectly on my 5D3.

I went down to my local "Henry's" camera store and they were nice enough to let me try my modded 10-18 on one of their 5D3's and sure enough it behaved exactly the same way.

The 10-18 works just fine with the 6D as reported by "Bright Colours", so I suspect this may have something to do with the advanced AF design of the 5D3. I also suspect that any other FF camera with advanced AF (like the 1Dx) might also have the same problem with these APS-C STM lenses.

Any thoughts as to what's going on with the 5D3's PD AF?

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8586.jpg~original

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8582.jpg~original

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8585.jpg~original

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8584.jpg~original

14mm on 5D3
IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8514.jpg~original

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8498.jpg~original

Mike Sowsun / S110 / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 18-135mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.8 STM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 1.4x II
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vengence
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Jul 16, 2014 13:40 |  #2

No ideas, but just wanted to say thanks for sharing your findings!




  
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Hermelin
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Jul 16, 2014 16:33 as a reply to  @ vengence's post |  #3

lol, why even bother with this and not just buy a UWA made for FF in the first place.


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msowsun
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Jul 16, 2014 16:41 |  #4

I have an Samyang 14mm that I am very happy with but I like the idea of a nice compact alternative that also has Image Stabilization. Since I already own both lenses, I thought it would be fun to try it out.


Mike Sowsun / S110 / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 18-135mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.8 STM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 1.4x II
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vengence
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Jul 16, 2014 17:42 |  #5

Hermelin wrote in post #17036216 (external link)
lol, why even bother with this and not just buy a UWA made for FF in the first place.

Because it's 60% less than the cheapst FF lens canon offers and 20% wider? Oh, and canon doesn't offer a FF UWA with IS?




  
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1Tanker
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Jul 16, 2014 17:51 as a reply to  @ vengence's post |  #6

Thanks Mike, for 1. doing this experiment. 2. reporting your results/issues.

While many just have that need to just ask "why", some actually try things, and this is how many great things/inventions are stumbled upon.

I love playing/modding things as well.. i just can't afford to anymore.

Keep up the good work, Mike.. and i hope you find out what the issue with the 5D3 is.. and find a workaround! :D


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frankchn
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Jul 16, 2014 17:52 |  #7

vengence wrote in post #17036336 (external link)
Because it's 60% less than the cheapst FF lens canon offers and 20% wider? Oh, and canon doesn't offer a FF UWA with IS?

Canon does actually -- Canon 16-35mm f/4L IS USM. Agreed that the 10-18 is much cheaper though, if a bit less versatile.




  
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msowsun
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Jul 16, 2014 17:58 |  #8

1Tanker wrote in post #17036351 (external link)
and i hope you find out what the issue with the 5D3 is.. and find a workaround! :D

I don't think there ever will be a workaround. I am Okay with that though because LiveView AF still works and I find it easy enough to Manual Focus just using the viewfinder.


Mike Sowsun / S110 / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 18-135mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.8 STM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 1.4x II
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vengence
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Jul 16, 2014 19:08 |  #9

frankchn wrote in post #17036353 (external link)
Canon does actually -- Canon 16-35mm f/4L IS USM. Agreed that the 10-18 is much cheaper though, if a bit less versatile.

Ahh, forgot they put it on that one. Still, it's only 4 times the price... ;)




  
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tat3406
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Jul 16, 2014 22:31 |  #10

Great modified. Have more sample picture?
Think over to purchase crop camera with this lens.


6D, 100L,24-70 F4L, 40mm pancake, 70-300L
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pkim1230
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Jul 16, 2014 23:47 |  #11

do you have more photos? those forrest shots dont really even look like wide angle shots.
i guess it shows that it vignettes a lot and too blurry in the corners to be useful.
also, do you have the link to bright color's thread about working it with 6d?



Gear | 6D, 550D, 1000D IR Modified, Samyang 24mm f/1.4, Rokinon 14mm f/2.8, Canon 40mm f/2.8, Tamron 70-300mm VC f/4-5.6, iOptron SkyTracker

  
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msowsun
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Jul 17, 2014 05:16 |  #12

pkim1230 wrote in post #17036847 (external link)
do you have more photos? those forrest shots dont really even look like wide angle shots.
i guess it shows that it vignettes a lot and too blurry in the corners to be useful.
also, do you have the link to bright color's thread about working it with 6d?

I haven't really taken any photos other than to test the vignetting with and without a filter.

Here is the link to the Photozone Forum thread where there are a few photos: http://forum.photozone​.de …-ef-14-18mm-f5-56-is-stm/ (external link)

And DPReview Forum thread: http://www.dpreview.co​m/forums/thread/369918​4 (external link)


Mike Sowsun / S110 / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 18-135mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.8 STM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 1.4x II
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msowsun
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Post edited over 2 years ago by msowsun.
     
Jul 17, 2014 11:07 |  #13

Here are a some quick snaps from today. I intentionally included the sun and it seemed to handle the flare quite well.

all 14mm at f/8

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8595.jpg

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8597.jpg

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IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8600.jpg

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8601.jpg

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8602.jpg

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8603.jpg

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8604.jpg

Mike Sowsun / S110 / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 18-135mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.8 STM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 1.4x II
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msowsun
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Jul 17, 2014 12:01 |  #14

8 more quick jpeg snaps from in front of my house today with a 67mm Hoya HD CPL. You can see some extra vignetting in the corners from the CPL.

all 14mm at f/11

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8605.jpg

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8606.jpg

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8607.jpg

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8608.jpg

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8610.jpg

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8611.jpg

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8609.jpg

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo15/5D3_8612.jpg

Mike Sowsun / S110 / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 18-135mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.8 STM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 1.4x II
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pkim1230
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Jul 17, 2014 17:16 |  #15

How messy does it get to do this mod? I have a crop camera and 6d so I'd like to switch it from time to time. Also I don't have a wide angle for my crop camera nor my 6d so this lens and mod could be a real option.



Gear | 6D, 550D, 1000D IR Modified, Samyang 24mm f/1.4, Rokinon 14mm f/2.8, Canon 40mm f/2.8, Tamron 70-300mm VC f/4-5.6, iOptron SkyTracker

  
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Modified EF-S 10-18 STM on 5D3
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