Do digital sensors have an MTF?

[Glenn NK]

Yes, improve one's composition/style to the point no one notices that the image is not in focus...

Well done - you caught on.

Glenn

[Steaphany]

Ted,

Thanks for the link to the LumoLabs "Understanding Image Sharpness" page, but even more relivent to this thread, and my photography ( At least how I conduct it ) are the links on the LumoLabs page to a couple references specifically on Modular Transfer Function:

How to Read MTF Curves, Part 1 by Hubert H. Nasse, Senior Scientist at Carl Zeiss AG

and

How to Read MTF Curves, Part 2 by Hubert H. Nasse, Senior Scientist at Carl Zeiss AG

[xpatUSA]

Ted,

Thanks for the link to the LumoLabs "Understanding Image Sharpness" page, but even more relivent to this thread, and my photography ( At least how I conduct it ) are the links on the LumoLabs page to a couple references specifically on Modular Transfer Function:

How to Read MTF Curves, Part 1 by Hubert H. Nasse, Senior Scientist at Carl Zeiss AG

and

How to Read MTF Curves, Part 2 by Hubert H. Nasse, Senior Scientist at Carl Zeiss AG

Yes, thanks Steaphany for the links - although I had already downloaded those two about a month ago. However, they seemed only to discuss lenses, monitors and printing and, after looking through them, I couldn't see anything showing an MTF curve for a sensor as such. Did I perhaps miss a page?

Oddly enough, I found a "perfect" slanted edge that I made after buying QuickMTF some months back and I tested it again yesterday:

. . . rats! so much for uploading my image!!!

This IP address has been banned for violating our Terms of Use

Not what I'd call friendly . . I'll put it up on my site instead . . . here y'are:



For some reason, I didn't get LumoLab's 64% at Nyquist but the created image itself is what one might expect from a perfect sensor (no blur filter, no bleeding etc and perfect conversion to RAW data) presented with a perfect slant edge at the sensor face. So I imagine that a real image arriving at a real sensor from a slant-edge test chart via a real lens would be "worse" than the above. Well, I know it would be because I've already done it in a SD9 vs D50 shoot-out.

best regards,

Ted