Archived posting to the Leica Users Group, 2005/06/15
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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