[dave9t5]

Here is something interesting about new lenses from Oly

 

https://www.imaging-resource.com/news/20...-pro-prime

 

Controlling the spherical aberrations to influence the bokeh is not a new concept.  

 

The Pentax-FA* 85mm F1.4 [IF] was/is renowned for it's creamy soft bokeh. 

https://www.flickr.com/photos/tags/Penta...mm%20f1.4/

 

My friend Dave (no relation to me), often claimed that he'd been told that the FA* 85mm was designed to front focus to create the background blur:

 

<p style="margin-left:40px;">https://www.dpreview.com/forums/post/28573381

<p style="margin-left:40px;"> 

<p style="margin-left:40px;">the FA 85 f1.4 may have been designed primarily (but not exclusively) for portrait work..that is exactly correct and I can assure you that was Pentax's intent,with absolute certainty (long story).

<p style="margin-left:40px;"> 

<p style="margin-left:40px;">it introduced a bit of "front focusing", which put the the subject at the rear of the zone of focus (depth of field) so that just behind the portrait subject, a beautiful soft background would be apparent, which in turn contributed to this lens's desirable bokeh.

 

I never really understood that but what he was trying to convey was that the spherical aberrations were front focused, exactly what Olympus describes in their marketing.

 

This lens was introduced in 1992.  Amazing that Olympus needs 25 years to "crack this code".