Pages: [1]   Go Down

Author Topic: Diffraction Compensation:How to compensate for lost sharpness at small apertures  (Read 967 times)

Dinarius

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 933
    • Denis Mortell Photography

I found this article really interesting, and it was one of the reasons I was querying the other day how to put the same image side-by-side on the screen to compare the effect of sharpening.

However, unless I'm going blind, when I put two of my Canon files together on the screen (at 100%) and tick the Diffraction Compensation box for one of them, I can see no change in sharpness.

Does this C1 feature only work with PhaseOne files?

Thanks.

D.
Logged

BartvanderWolf

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 6940

I found this article really interesting, and it was one of the reasons I was querying the other day how to put the same image side-by-side on the screen to compare the effect of sharpening.

However, unless I'm going blind, when I put two of my Canon files together on the screen (at 100%) and tick the Diffraction Compensation box for one of them, I can see no change in sharpness.

Does this C1 feature only work with PhaseOne files?

Hi,

No, it works on all Raw (!) images. However, it targets diffraction only, not defocus. Therefore, it is most effective in the plane of best focus, not so much at the edges of the DOF zone.

Cheers,
Bart
Logged
== If you do what you did, you'll get what you got. ==

Dinarius

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 933
    • Denis Mortell Photography

Hi Bart,

Thanks for the reply.

Yes, of course I was comparing RAW files, but obviously not the kind that would show a difference.

Will try again.

Good to know it will work with my Canon, in any case. It's a really neat addition to C1.

Would be interested to hear people's views on noise and Diffraction Compensation.

Cheers!

D.
Logged

Dave Ellis

  • Jr. Member
  • **
  • Offline Offline
  • Posts: 90

I found this article really interesting, and it was one of the reasons I was querying the other day how to put the same image side-by-side on the screen to compare the effect of sharpening.

However, unless I'm going blind, when I put two of my Canon files together on the screen (at 100%) and tick the Diffraction Compensation box for one of them, I can see no change in sharpness.

Does this C1 feature only work with PhaseOne files?

Thanks.

D.

Hi D

I'd suggest you take a raw shot of something like a Siemens test chart initially with an f stop of f/22. Zero out the default sharpening in C1 and then toggle between Diffraction Compensation on and off, viewing at 100%. There should be a noticeable effect in the innermost region of the chart. After that move on to real world images with some distinct edges (sign lettering etc) and once again shoot with f/22.

Dave
« Last Edit: February 05, 2017, 04:13:05 AM by Dave Ellis »
Logged

Dinarius

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 933
    • Denis Mortell Photography

Dave,

Many thanks for the reply.

D.
Logged
Pages: [1]   Go Up