Archived posting to the Leica Users Group, 2010/09/20
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I can compromise at f4 fore sure Marty! I grew up looking at countless pop photo and modern photo lens tests. And sure many of them peaked way before f8. The curve curves but it does curve. And from what I know now every lens is made faster than the lens designers would prefer them to be. They are as fast as they are because the marketing people insist on it. As they are competing with the competition down the street; Oberkochen. -------------------- Mark William Rabiner Photography mark at rabinergroup.com > From: Marty Deveney <benedenia at gmail.com> > Reply-To: Leica Users Group <lug at leica-users.org> > Date: Mon, 20 Sep 2010 15:05:06 +0930 > To: Leica Users Group <lug at leica-users.org> > Subject: Re: [Leica] Fuji's rangefinder sort of looking digital > > The .pdfs for the camera with the lens MTFs show clearly that the lens > improves when stopped down from f2 to f4, but showing f4 as the second > aperture stop on the MTF charts suggests strongly that it is at its > best there and that further stopping down either does not improve its > performance or makes it worse. > > Marty > > > On Mon, Sep 20, 2010 at 2:40 PM, Mark Rabiner <mark at rabinergroup.com> > wrote: >> When ever I read or hear that stopping down a lens makes NO IMPROVEMENT I >> take it with a bit of a grain of thought as from all I know this is basic >> to >> optics that some improvement is going to show itself when you this to any >> lens. I think such statements is a wishful thinking extention off the >> concept that if you pay enough money for a lens the wide open performance >> will be nothing to be embarrassed about. Quite usable. And even stellar. I >> think stopping down ANY lens one or two can do nothing but but get rid of >> a >> few aberrations and contusions. Let alone actually get the thing you're >> shooting in focus. I'm a f 5.6 and be there kind of guy for the most part. >> Sure I shot wide open when I need the extra narrow DOF for effect or when >> I >> need the shutter speed. Like when its dusk or indoors. >> >> -------------------- >> Mark William Rabiner >> Photography >> mark at rabinergroup.com >> >> >>> From: Peter Cheyne <geordiepete211 at yahoo.co.uk> >>> Reply-To: Leica Users Group <lug at leica-users.org> >>> Date: Mon, 20 Sep 2010 11:01:00 +0900 >>> To: Leica Users Group <lug at leica-users.org> >>> Subject: [Leica] ?Fuji's rangefinder sort of looking digital >>> >>> That 'rewind lever' on the front cold be to set the built-in ND >>> filter. ?I suppose it slides in and out behind the lens. >>> >>> Looks like an elegant little camera. ?I hope the auto-focus is faster >>> than the elegant little Fujifilm Klasse (f2.6, 38mm) I have. >>> >>> I think something got lost in translation here: >>> ? "In addition, the lens features not only the large F2 aperture >>> value, but also an optical architecture that maintains a high degree >>> of resolution even when closed by 1 to 2 stops." ?Italics on 'even >>> when closed by 1 to 2 stops.' ?I think they meant 'that gets even >>> better', not 'even'. >>> >>> Peter Cheyne >>> >>> _______________________________________________ >>> 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 >> > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information