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What is DXO Mark Mobile and should you care?

GeneralEdward Kiledjian

Over the span of a couple of weeks, we saw three phones released, and with every release, the manufacturer touted the device's incredible "best ever" DXO Mark Mobile performance rating:

  1. Samsung released the Galaxy Note 8 with a DXO Camera score of 94
  2. Apple released the iPhone 8 Plus with a DXO Camera score of 94
  3. Google released the Pixel 2 / Pixel 2 XL with a DXO Camera score of 98

Manufacturers love touting these scores to "prove" that they have designed the finest camera a distinguished tech user could ask for. For all intents and purposes, technology should get better and this means every new phone released (at the high end) should have better overall performance than its predecessor. Why would you buy an inferior phone?

While most blogs blindly write headlines repeating this single "representative" number, very few actually take the time to read the full DXO reviews and explain the details to their readers. 

It's complicated

The first thing to keep in mind that blending complex factors into a single easy to digest number is complicated and sometimes may mislead some readers. While most blogs only show the single number, DXO actually provides a generous amount of valuable information for the curious reader.

The DXO tests include a slew of carefully controlled tests and other real world tests that are more subjective. 

If we pick on today's "highest ranking" phone, the Google Pixel 2, here is how the rating of 98 is made up:

DXO provides detailed test results and write-ups for each of these categories. While most blogs will tout that the Pixel 2 has a rating of 98 (the best ever rating for a smartphone), they rarely provide the makeup of that number.

And the make-up of that number is critical to your buying decision. If you will use the camera primarily for video, you may notice it scored 96. You can also check out how DXO made up that score by evaluating what is important to you about video (which attributes are more important to you).

  • Exposure and contrast
  • color
  • Autofocus
  • Texture
  • Noise
  • Artifacts
  • Stabilization

Remeber that the video rating fo 96 is not a straight average but rather a "black box" formulae closely guarded by DXO. 

Is DXO Mark Trustworthy?

The next question is "can you trust the DXO testing methodology"?

Having reviewed the public information made available by DXO, I say yes. They have a well-documented methodology that is as good as it is going to get. I trust their rating but use the detailed review information to make up my mind, not the single number most blogs publicise. 

It is also important to keep in mind that DXO is a for-profit consulting company that manufacturers hire. DXO works with manufacturers to tune their imaging systems and get the best possible performance out of the equipment and software. DXO also sells image quality testing solutions.

I do not believe this consulting arm influences the device ratings in any way but it is still an important fact to keep in mind.

DXO Optics Pro

DXO Optics makes very good photo improvement software because of all this camera/lens knowledge they have accumulated. They know the shortcomings of each of the camera/lens combos and can this build specific correction profiles. 

I own their software and paid for it myself. 

90% of all the questions I receive these days is about comparing the iPhone to the Google Pixel2.  In addition to all the information I have already written and the info provided above, there is one more piece of knowledge you should consider. 

The Google Camera app on the Pixel 2 does not natively support RAW (the iPhone 5s or newer) does. This means DXO Optics Pro has corrective filters for all these iPhone RAW images, but does not for the Google Pixel2. This could be a major deciding factor for more astute or demanding mobile photographer.

Conclusion

I know most users simply don't care about the details. They want one easy to read headline that justifies their belief (Google is better / iPhone is better). My ask is that you, my more knowledgeable readers, take the time to look at the data that makes up the numbers.

It's a worthwhile investment of your time.

Canon SL1 may be the perfect family dSLR

technologyEdward Kiledjian
SL1-large.gif

As the holiday season approaches, you may be looking for a great all purpose camera and the Canon Rebel  SL1 will definitely not disappoint. It is called the world's smallest and lightest APS-C dSLR.

The Rebel SL1 is the smaller brother of the larger Rebel T5i. They both share the same 18MP sensor and DIGIC 5 processor.  Its fantastic that Canon was able to fit all of the t5i guts into such a small body and at the same time keeping most of the Rebel family buttons intact.

Typically most users jumping to this family of device are coming from point and shoot devices and are looking for better quality photos but also fast autofocus. The Rebel SL1 won't disappoint with the generation 2 of Canon's hybrid CMOS Autofocus system. 

Picture Quality

Even though I knew the SL1 contains the same guts as the T5i, I was expecting sub-par image quality but I was wrong. The device produced beautiful beautiful, vivid and sharp JPG images from ISO 100 to ISO 800. The in camera processing was excellent which means you won't have to save in RAW then spend time converting to JPG with a PC app. When you reach ISO 1600, you start to lose some of the finer detail and the inclusion of light artifacts.

As you continue to increase the ISO, the images become less sharp, you start seeing chromatic aberrations and you lose some of the vividness. The worst of it hits around ISO 12000.

The camera supports the Canon RAW format and at lower ISO (under 1600) the quality is comparable to the in-camera generated JPG. The higher the ISO the better it is to shoot in RAW so you can perform post-processing to improve the final results.

 

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Conclusion

Overall I think this is a fantastic camera for the general camera user looking for a small and light dSLR. The design is small but easy to grip. Images up to ISO 6400 are wonderful even when using the in-camera JPG conversion feature. The screen is touch responsive and a good representation of the picture you will take. The new hybrid auto-focus is fast and accurate (little lag between press and take). Little chromatic aberrations and full HD video recording capabilities.

Are there any negatives? Yes Sir!

Although many may prefer the smaller frame, those with bigger hands may find it too small.the Autofocus illuminator is built into the flash which means the flash has to be enabled to use it. This is not desirable because I tend to prefer non-flash pictures when possible.

Overall an excellent purchase for most consumers and highly recommended.