IT168? Review In fact, this article originally wanted to be called "The Poor Man's Fourth Treasure - Canon EF-S 10-18mm STM Review", but because it may confuse some friends who don't understand yet There was a misunderstanding, so I raised another topic. But in my mind, this lens is fully qualified to join Canon’s Four Affordable Treasures Plan. I believe Canon users should be familiar with Canon’s three EF-S lenses, collectively known as the poor man’s three treasures. They are EF-S 18-55mm f/3.5-5.6 IS STM and EF-S 55-250mm f/4-5.6 IS STM. And the EF 50mm f/1.8 II lens, known as the "little spittoon".
Because these three lenses are cheap and cover a wide range of focal lengths, they are deeply loved by junior players and home users. Of course, I think the reason for this love is more because these three lenses are really practical. It's very cheap. Canon launched a brand new EF-S ultra-wide lens this year, the EF-S 10-18mm f/4.5-5.6 IS STM lens (equivalent focal length 16-29mm). This lens can be regarded as filling the gap that the previous "poor man's three treasures" lacked. It has a super wide focal length, so today we will show you how this lens performs in all aspects.
Advantages:
1. Cheap price
2. Lightweight and portable
2. Super wide focal length
3. With the Canon EOS body lens, the compensation effect is obvious
Disadvantages:
1. The workmanship is slightly average
2. The aperture is slightly smaller
< p>3. The glare is somewhat obviousAppearance:
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Resolution:
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Distortion test:
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Vignetting test:
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Real shot Samples:
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Purchase guidance:
There is another Canon APS-C format ultra-wide lens currently on the market that Canon has An EF-S 10-22mm f/3.5-4.5 USM lens was launched in 2004, which is equivalent to about 16-35mm, without IS anti-shake. The new EF-S 10-18mm f/4.5-5.6 IS STM lens not only comes with IS anti-shake but also uses an STM stepper motor with smoother autofocus and lighter sound.
In terms of price, the EF-S 10-18mm f/4.5-5.6 IS STM is also very affordable. It is currently priced at 2,399 yuan. Click to view the details. Although the maximum aperture is smaller, you can get one at this price. With an ultra-wide focal length zoom lens, other factors become less important. You don’t need such a large aperture during the day. When shooting at night, using a tripod can solve the problem of a small aperture. And for subjects like the starry sky at night, I think focal length is more important than aperture. In short, I think this is the best choice for Canon APS-C format users who like ultra-wide focal length.
Overall lightweight and portable
The minimum focusing distance of Canon EF-S 10-18mm f/4.5-5.6 IS STM can reach 0.22m, the equivalent focal length is 16-29mm, and the overall size is very small It is small and very light, weighing only 240g. It is about the same size as Canon's most common kit lens, the Canon EF-S 18-55mm f/3.5-5.6 IS STM. The length and weight of the two lenses are almost the same.
▲Canon EF-S 10-18mm f/4.5-5.6 IS STM
▲Canon EF-S 10-18mm f/4.5-5.6 IS STM
▲Canon EF-S 10-18mm f/4.5-5.6 IS STM
▲Canon EF-S 10-18mm f/4.5-5.6 IS STM
▲Canon EF-S 10-18mm f/4.5-5.6 IS STM IS anti-shake technology with 4-stop compensation effect
Summary:
The characteristics of this lens are that it is light and small, very easy to carry, and really It is a good lens suitable for traveling. But considering the price, let’s not talk about the lack of materials and the lack of a focusing frame.
The center resolution of the lens is very good
The Canon EF-S 10-18mm f/4.5-5.6 IS STM lens adopts a design of 14 elements in 11 groups, including 1 UD lens and two aspherical lenses.
▲Canon EF-S 10-18mm f/4.5-5.6 IS STM MTF curve
How to interpret the MTF curve? Click me!
It can be seen from the lens curve chart of Canon EF-S 10-18mm f/4.5-5.6 IS STM that the resolution performance of this lens at the maximum aperture and F8 is very good, and the edge drawing at 10mm is very good. The quality decline is serious and other performance is acceptable. We can also look at the MTF curve of the EF-S 10-22mm f/3.5-4.5 USM, an ultra-wide lens launched by Canon in 2004 for the APS-C format.
▲Canon EF-S 10-22mm f/3.5-4.5 USM lens curve chart
As can be seen from these two curve charts, Canon EF-S 10-18mm f The optical quality of the /4.5-5.6 IS STM lens is obviously much better than the previous Canon EF-S 10-22mm f/3.5-4.5 USM lens.
However, we still have to test the Canon EF-S 10-18mm f/4.5-5.6 IS STM lens in the evaluation environment. We used the ISO12233 standard resolution test card to test the resolution performance of this lens, and later used Imatest software to analyze the test results. This test all uses Canon EOS 7D Mark II (20.2 million effective pixels) with Canon Canon EF-S 10-18mm f/4.5-5.6 IS STM lens for testing.
▲Center resolution test results
▲Edge resolution test results
The test results show Canon EF-S 10-18mm f/4.5-5.6 IS STM The performance of this lens is basically the same as that shown in the MTF curve. The center resolution is good at both F5.6 and F8, while the best edge resolution occurs at F8 aperture. So overall, at F8 At the aperture, this lens can show a good overall resolution.
▲A partial 100% screenshot of the sample taken indoors
See the performance of Canon EF-S 10-18mm f/4.5-5.6 IS STM through a 100% screenshot of a partial sample taken indoors In line with the objective test results, the resolution is pretty good.
▲Aperture: F8 Shutter: 1/4s Sensitivity: ISO100
Partial screenshots of outdoor proofs also show good resolution performance.
Distortion test: After turning on distortion correction, the distortion is almost invisible
Canon EF-S 10-18mm f/4.5-5.6 IS STM is an ultra-wide-angle lens, and distortion is definitely a problem with this lens. To avoid problems, since the test machine Canon EOS 7D Mark II has added lens distortion correction, this function is especially useful for wide-angle lenses.
And since this lens was launched before the Canon EOS 7D Mark II, the correction data of this lens already exists in the Canon EOS 7D Mark II. During the test, we also turned off the in-camera distortion correction and turned on the distortion correction. model was tested.
▲Canon EOS 7D Mark II has added lens distortion correction
The lens distortion test still uses Canon EOS 7D Mark II (20.2 million effective pixels) with Canon Canon EF-S 10- A combination of 18mm f/4.5-5.6 IS STM lenses, and Imatest software was used to process the data later. The test results are expressed as a percentage. The closer the value is to zero, the smaller the distortion. The test result value is negative, indicating barrel distortion, and the picture expands outward. On the contrary, it is expressed as pincushion distortion, and the picture shrinks inward.
10mm end distortion test:
▲10mm end without internal distortion correction
Canon EF-S 10-18mm f/4.5-5.6 IS STM The distortion value at the 10mm end of the lens is -3.09%, which is barrel distortion. The distortion can be said to be very obvious.
▲Turn on the in-camera deformation correction for the 10mm end
The test result after turning on the in-camera deformation correction is -0.255%. It can be clearly felt that the distortion compensation effect is very good after turning on the deformation correction. obvious.
18mm end distortion test:
▲The 18mm end does not turn on the in-camera distortion correction
Canon EF-S 10-18mm f/4.5-5.6 IS STM this The distortion value at the 18mm end of this lens is 0.209%, which is pincushion distortion. The distortion test result is within 1%, and the distortion effect is within the acceptable range.
▲Turn on the in-camera deformation correction at the 18mm end
After turning on the in-camera deformation correction, the distortion at the 18mm end was also effectively compensated, and the test result was -0.0681%. Distortion is almost negligible.
Summary:
Needless to say, everyone can see how obvious the correction effect of Canon's EOS SDS is against the original lens. What is currently known is that Canon EOS 7D Mark II is Deformation correction can be performed directly in the camera, while other models can only use Canon's DPP software for post-correction, so when using this lens, you may wish to consider using it with the Canon EOS 7D Mark II body.
Vignetting test: Vignetting is almost invisible after peripheral light correction is turned on
Vignetting is also the longest problem encountered by wide-angle lenses. After turning on peripheral light correction in the camera, It basically eliminates most of the vignetting of the Canon EF-S 10-18mm f/4.5-5.6 IS STM, except for a little trace of vignetting at the maximum aperture of 10mm and 18mm.
▲10mm end vignetting test (turn on peripheral light correction)
▲18mm end vignetting test (turn on peripheral light correction)
Now there are many Canon EOS SLR cameras have a built-in lens peripheral light correction function. If you do not have Canon EF-S 10-18mm f/4.5-5.6 IS STM data, you can download the updated data through the Internet.
Flare test: encountered relatively obvious ghosting
Canon’s lens uses 14 elements, so there are 28 reflective surfaces, so many Reflective surfaces will inevitably encounter ghosting problems. Let’s take a look at the actual performance of this lens.
▲Glare test
When shooting outdoors, I did not install a hood on the lens, so I encountered more obvious glare, so if you want to avoid glare, you should try to use shading. cover.
Canon EF-S 10-18mm f/4.5-5.6 IS STM real shot sample:
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▲Real shot Take proofs
▲Real proofs