Can lens or camera have a 'clinical' rendering?

Started 1 month ago | Discussions thread
57even Forum Pro • Posts: 14,724
Re: Can lens or camera have a 'clinical' rendering?
6

fPrime wrote:

57even wrote:

fPrime wrote:

57even wrote:

fPrime wrote:

I’ve certainly described some lenses as clinical. To me a “clinical” lens is simply one that is highly corrected for optical aberrations, distortion, vignetting, and soft corners when shot wide open. I use the term dispassionately. For some applications (like astrophotography, for example) a clinical rendering quality is actually preferable.

The downside of clinical lenses is that they tend to draw less microcontrast and 3D Pop once stopped down. That can be counterproductive to some photographic use cases.

fPrime

This doesn't make a lot of sense. Why can't a well corrected lens have good microcontrast?

It’s likely that my definition of microcontrast differs from yours.

fPrime

That doesn't answer my question.

I didn't want to sidetrack Erik's thread on clinical rendering into yet another microcontrast debate. But basically, if microcontrast is defined as simply an extension of global contrast with respect to higher spatial frequencies which yields more “bite” in the fine details of an image, then extremely well-corrected lenses will certainly deliver more of that quality.

If, however, we view microcontrast as tonal gradation, then these same, sharper, clinical lenses deliver less image microcontrast. How so? High Refractive Index glass elements differentially absorb fragile blue wavelengths over green and red wavelengths. The more elements that designers use to correct for aberrations and un-sharp corners, the more that low-gain blue wavelengths in the scene are gated out. This muddies the scene's microcontrast globally but especially so in the shadows and dark portions where low-gain blue wavelengths often dominate.

fPrime

Did you just make that up or read it on an internet site?

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