Forum Twitter Facebook Google + RSS

Author Topic: Very odd score: needs explanation  (Read 2219 times)

Offline mg428

  • Newbie
  • *
  • Posts: 8
Very odd score: needs explanation
« on: April 28, 2014, 11:27:44 am »
This a comment for this page on the website
The G lens only excels at one paramter (sharpness, acutance to be more specific) and only at one aperture, the widest f/2.8 aperture to be more specific. On the most of the rest of the parameters the G lens performs significantly worse. CA worths specific mention in this regard despite the ED element in the G lens.


(Note: If this were a lens where the most important aspect were high performance at maximum aperture, this could have been the explanation, but even the review explicitly states that performing high at f/2.8 is not what people look for on macro lenses. I'd like to also remind that when closed focused the aperture will be automatically stopped down.)

Offline Sophie - DxOMark

  • Administrator
  • Sr. Member
  • *****
  • Posts: 488
Re: Very odd score: needs explanation
« Reply #1 on: June 03, 2014, 10:23:01 am »
Thank you for your interest in DxOMark, and our apologies for the late reply.
The DxOMark score does not take into account CA, as it can be corrected without any loss of information. All the other aspects, on the other hand, are taken into account. Here is how we process: for each focal, we take the best aperture, and in the case of the 60mm f/2.8 G, the best score is achieved at f/2.8.
The former version (D) achieves a very high sharpness at f/5.6, but when you take noise sensor into account - in lowlight condtions as we proceed to compute the overall score - the best focal aperture remains 60mm f/2.8. Unfortunately, sharpness is not as high as we measured it at f/5.6, and that difference explains the odd DxOMark score in regard to the other score you're mentioning.

Hope this helps.