Archived posting to the Leica Users Group, 2010/09/18
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]yes and no. i you focus the noctilux at 5 feet, you get a DOF (under a 0.03mm COC) of just over 2 inches total. if you focus a 200/f2 at 5 feet, your DOF (under the same assumptions as above) about 1/4 inch total. however, to capture the same target area as the noctilux at 5 feet, you would need to shoot the 200mm from about 20 feet away. At that distance, DOF is a little over 4 inches. if the film/sensor format is fixed, and the area you wish to photograph is predetermined (e.g., a head and shoulders portrait) and you will compensate for magnification of differing focal lengths by changing distance to the subject, then f stop becomes the primary determinant of depth of field. hence the 50mm summicron wide open has virtually the same DOF at 5 feet as the 200mm f2 wide open at 20 feet. the 21 lux at 6.3 feet has about the same DOF as the 75 lux at 22.5 feet (2.3-2.4 feet DOF). -rei On 09/18/2010 01:51 AM, Mark Rabiner wrote: > 250mm f/2 That's more Noctiluxlike like than a Noctilux! > > -------------------- > Mark William Rabiner > Photography > mark at rabinergroup.com > > >> From: Alan Magayne-Roshak<amr3 at uwm.edu> >> Reply-To: Leica Users Group<lug at leica-users.org> >> Date: Sat, 18 Sep 2010 00:01:26 -0500 (CDT) >> To: Leica Users Group<lug at leica-users.org> >> Subject: Re: [Leica] Wow! 200mm f/2G ED-IF AF-S VR Nikkor - Oly 250mm f/2 >> >> On Fri, 17 Sep 2010 Mark Rabiner<mark at rabinergroup.com> wrote: >> >> Would 200mm f2 but as thin a slice as a 50 f1 DOF wise? >> Seems like it would. >> ============================================================================== >> ========= >> I have an Olympus 250mm f/2 that should have even thinner DoF than that >> Nikon >> lens. >> >> On a 5D MkII with adapter: >> <http://gallery.leica-users.org/v/Alan+Magayne-Roshak/LensFun/Brian250_f2_AMR. >> jpg.html> >> <http://gallery.leica-users.org/v/Alan+Magayne-Roshak/LensFun/Brian250_f2_AMR_ >> Crop.jpg.html> >> >> I'd use it more if it wasn't such a monster to carry. >> >> Alan >> >> Alan Magayne-Roshak, Senior Photographer >> UPAA POY 1978 >> University Information Technology Services >> University of Wisconsin-Milwaukee >> amr3 at uwm.edu >> http://gallery.leica-users.org/v/Alan+Magayne-Roshak/ >> >> _______________________________________________ >> 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