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Forums > Back > Canon EF 14-18mm f5-5.6 IS STM ;)
Brightcolours
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#1
07-13-2014, 06:47 PM
Yesterday I bought a Canon EF-S 10-18mm f4.5-5.6 IS STM. First tested it on my EOS M to see if it had bad alignment or other issues, but all seemed quite ok.

 

I screwed off the mount, it encompasses the entire back of the lens, one single piece. I sawed off the part that protrudes into the FF mirror box too much (the mirror will hit it), sanded it down some more to be sure the back plate/mount clears the mirror, and screwed it back on again.

 

To my surprise, at 14mm the lens already does not vignet anymore (real vignetting I mean, not the light fall off variety). So, the lens is essentially a 14-18mm f5-5.6 lens on full frame! At 13mm black corners appear.

 

At 18mm f8:

[Image: gallery_10230_63_332082.jpg]

 

And at 14mm f8:

[Image: gallery_10230_63_188637.jpg]

 

Maybe not too bad, for a €269 lens that weighs a bit over 200 grams, and which has IS and silent AF? Makes for a nice light travel UWA I think. More testing this week (only finished adapting it 2 hours ago).

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Rover
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#2
07-13-2014, 09:08 PM (This post was last modified: 07-13-2014, 09:09 PM by Rover.)
Beats the ubiquitous Samyang 14mm for this purpose I guess... Smaller, has AF, AE and IS, can use filters out of the box. Though this conversion is not for the faint of heart.
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Brightcolours
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#3
07-14-2014, 08:18 AM
Well, it beats it with AF, AE and IS, can indeed use filters, and beats it with much lower distortion. But the Samyang beats this lens by a large margin in light fall off performance towards the corners, and corner sharpness (they get rather mushy with this lens). More test images to follow.

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Rover
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#4
07-14-2014, 11:00 AM (This post was last modified: 07-14-2014, 11:02 AM by Rover.)
RE: sharpness: doesn't it get acceptable stopped down?

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Brightcolours
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#5
07-14-2014, 05:16 PM
The overall sharpness gets pretty good, so it is not an issue for every shot. But the extreme corners remain mushy, a larger area at 14mm than at 18mm. I will post more images somewhere this week.

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popo
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#6
07-14-2014, 05:42 PM
Would also be interested to see the mod too!

<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.
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Rover
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#7
07-14-2014, 06:48 PM
My Sigma 14/2.8 never really gets sharp in the extreme corners of APS-H frame, and it's a full frame lens weighing 655 grams. My point is, maybe it's naive to await miracles from this EF-S lens that weighs 1/3 of the Sigma...
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Brightcolours
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#8
07-14-2014, 06:58 PM
Quote:My Sigma 14/2.8 never really gets sharp in the extreme corners of APS-H frame, and it's a full frame lens weighing 655 grams. My point is, maybe it's naive to await miracles from this EF-S lens that weighs 1/3 of the Sigma...
I'll be sure to make an APS-H crop for you to judge.

 

Quote:Would also be interested to see the mod too!
I'll make a photo of the "mutilated" backside for you.
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Rover
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#9
07-15-2014, 05:07 AM
Thanks, though I'll hardly ever get around to replacing the Sigma - I'm too fond of it even though I'm only using it sporadically.

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Brightcolours
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#10
07-15-2014, 11:21 PM (This post was last modified: 07-15-2014, 11:47 PM by Brightcolours.)
Quote:Thanks, though I'll hardly ever get around to replacing the Sigma - I'm too fond of it even though I'm only using it sporadically.
Just to get an idea:

the lens at 12mm (f8), cropped to 1.3x crop format (CA corrected in PS, standard DPP conversion):

[Image: gallery_10230_63_773376.jpg]

 

Sorry, photozone seems to downsize the file to 1600 pixels wide max.

Later I will post a 13mm and 14mm 1.3x crop example.
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