Archived posting to the Leica Users Group, 2005/06/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Many zooms (including expensive Nikkors) also exexhibit this focus shift. Mike ----- Original Message ----- From: "Feli" <feli2@earthlink.net> To: "Leica Users Group" <lug@leica-users.org> Cc: <lug@leicausers.org> Sent: Thursday, June 16, 2005 2:12 AM Subject: Re: [Leica] Re: darkroom focusing > I'm not an expert on optics, but the Noctilux is one of the best corrected > lenses around and it has a serious > focus shift... > > feli > > On Jun 15, 2005, at 7:18 PM, Herbert Kanner wrote: > >> I think focus shift is a myth. If the focus were to shift when stopping >> down, this would indicate that spherical aberration is so poorly >> corrected that the portion (a ring) of the lens that is active between >> say f/8 (the enlarging aperture)and say f/2,8, the focusing aperture, has >> a marked;y different focus distance than the portion (a circle) from the >> center to the periphery at f/2.8. If this were true, the lens would >> suck; it would be noticeably fuzzy at f/2.8. >> >> Herb >> -- > ________________________________________________________ > feli2@earthlink.net 2 + 2 = 4 www.elanphotos.com > > > no archive > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > -- I am using the free version of SPAMfighter for private users. It has removed 371 spam emails to date. Paying users do not have this message in their emails. Try www.SPAMfighter.com for free now!