Archived posting to the Leica Users Group, 2008/11/24
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]On Nov 23, 2008, at 2:36 PM, Steve Barbour wrote: > > On Nov 23, 2008, at 2:11 PM, Geoff Hopkinson wrote: > >> Steve you really need good contrast to achieve good resolution, the >> two go >> hand in hand. > > to a degree, as you suggest Geoff, you need some contrast to measure > resolution, but the DR offers a combination of very high resolution > with very low contrast.... > > beyond that, I don't believe there is any relationship between the > two parameters... since I don't know more, I'll leave it to others > with real expertise in optics to clarify, if they can and wish... > > it's my impression that the unusual properties and look of the DR > have always been attributed to its unique balance of very high > resolution and low contrast... I believe this to be correct...the two parameters are basically independent, although perceived ! sharpness ! can be another story, even coming from high contrast, without excellent lens resolution.... Steve > > > but when it comes to physics and optics, I don't know, and I didn't > sleep in a Holiday Inn last night... > > > Steve > > > > >> The well recognised smooth look that you are describing may be >> partly from moderate contrast, but also from the degree of correction >> present. With more aberration present, the out of focus blurs can >> retain >> their general shape and be smoother by being more blurred! That is >> not meant >> to be a criticism of valid personal preference. Of course my taste >> there is >> probably well established. >> >> Has anyone else noticed that this evolving thread is almost a >> digest of >> perennial LUG topics? >> Lens coatings, >> Lens cleaning, >> Artistic vs. technical, >> Favourite lenses >> What great master photographers used etc etc >> Now I suppose I have introduced the B word. >> >> >> Cheers >> Geoff >> http://www.pbase.com/hoppyman/e >> http://gallery.leica-users.org/v/gh/ >> Pick up your camera and make the best photo you can. >> >> -----Original Message----- >> Subject: Re: [Leica] Are Leica lenses muliticoated? >> >> >> this same argument applies to some of the greatest and highest >> resolution >> lenses of the past...for example the Summicron 50/2 DR...low >> contrast >> combined with very high resolution allows a unique smooth >> look...and you can >> always increase the contrast if desired... >> >> I am not sure how the coating impacts, or what the coating is for >> the DR... >> >> this look and behavior likely accounts for this lens being the >> desert island >> favorite of so many individuals... >> >> >> Steve >> >> >> >> >> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information