Chromatic Aberration ~ software intervention Nikon Nikkor-P 10.5cm f/2.5 c.1959/1960

Once I sorted out how to apply chromatic aberration software corrections to old manual focus lenses I set about to have a look at a few of my oldest lenses, beginning with a well used, mostly clean glass Nikon Nikkor-P 10.5cm f/2.5 9 aperture blade "tick-mark" transition c.1959/1960 lens.

To review, here's how I enabled automated chromatic aberration correction in RawTherapee.

 Rawtherapee -> RAW -> Chromatic Aberration Correction -> select Auto-correction

Pretty simple, right?

Setup ~ 

• Sony A6300 set on a tripod 
• +1EV (because of the strong white back-light) 
• 2 second self timer
• ISO100 focusing on the stick 
• Images made at f/2.5, f/4, f/5.6, and f/8
  
• Processed in RawTherapee 

Voila! encore the mundane scene of my Rescue Orchid - 

 

 

I took three processing steps and share the results in the following image.

• Demosaic and color management only as the starting point
• Add RAW -> chromatic aberration correction to the starting point
• Add Capture Sharpen to chromatic aberration, demosaic, and color managed image

Comments ~ 

There's not much to say.  It's obvious there is little CA in this lens.  It renders beautifully at all apertures.  Using chromatic aberration and "sharpness" software intervention on this optic feels like it brings this ancient lens right into line with modern products quite nicely.