Canon Digital Lens Optimizer (DLO)

Started May 12, 2013 | Discussions thread
TTMartin
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Re: Canon Digital Lens Optimizer (DLO)
In reply to asad137, May 12, 2013

asad137 wrote:

Are the results as good as the examples on the Canon site indicates?

In my experience, yes with a caveat: If there is noise in the image, the DLO algorithm will create odd artifacts (similar to what you might get using too strong an unsharp mask). For low-noise images it is really excellent; with higher noise images you will have to make a personal judgement between the extra sharpening and the added artifacts (DLO can be applied as a percentage).

Edit to add: Many of the example shots shown on the Canon side are taken at very small apertures (f/22 and the like) where diffraction is the dominant source of image fuzziness. In these cases, a more traditional sharpening method (like an unsharp mask) is likely to work nearly as well as DLO, because diffraction is a more-or-less symmetrical effect and whose transfer function can be approximated by the gaussian blurring in an unsharp mask algorithm.

I did my tests on three shot made with a Canon EOS Digital Rebel XTi and EF 40mm f/2.8 STM lens. Shots were taken at 1/200, f/5.6 and ISO 100. That camera and lens combination doesn't deliver distance information. In two of pictures there was a small feature in the outer 3rd of the image that I wanted to be as sharp as possible. I set all sharpening and noise reduction to 0. I set the strength to around 75. I moved the distance slider back and forth using the preview to find where that feature was as sharp as possible.

Unfortunately, I did not keep an unaltered copy of the RAW file so I don't have before and after shots. But, the results on both the feature and the overall photo was quite noticeable.

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