Archived posting to the Leica Users Group, 2007/04/01
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I wanted to make sure that the aperture was set where I wanted it, so I had to move the camera from my face. I just made sure it was in focus again before hitting the shutter button. Under more controlled conditions, I'd have had it on a tripod. Jeffery Smith New Orleans, LA http://www.400tx.com http://400tx.blogspot.com/ -----Original Message----- From: lug-bounces+jsmith342=cox.net@leica-users.org [mailto:lug-bounces+jsmith342=cox.net@leica-users.org] On Behalf Of G Hopkinson Sent: Sunday, April 01, 2007 6:23 PM To: 'Leica Users Group' Subject: RE: [Leica] Focus shift on 50/1.4 Nikkor on M8 OK, well I think that may add another variable. The focus point may not be identical if you change the aperture AFTER focusing. I thought that the back focus (or front focus) issue was when the rangefinder was coincident, at the shooting aperture, but the image has a different point of sharpest focus? This error would be most visible with large apertures, and closer subjects, due to the inherent lack of DoF? Cheers Hoppy -----Original Message----- From: lug-bounces+hoppyman=bigpond.net.au@leica-users.org [mailto:lug-bounces+hoppyman=bigpond.net.au@leica-users.org] On Behalf Of Jeffery Smith Sent: Monday, 2 April 2007 08:54 To: 'Leica Users Group' Subject: RE: [Leica] Focus shift on 50/1.4 Nikkor on M8 I'm focusing with each shot, and stopping down the aperture one stop at a time. Jeffery Smith New Orleans, LA http://www.400tx.com http://400tx.blogspot.com/ -----Original Message----- From: lug-bounces+jsmith342=cox.net@leica-users.org [mailto:lug-bounces+jsmith342=cox.net@leica-users.org] On Behalf Of G Hopkinson Sent: Sunday, April 01, 2007 5:45 PM To: 'Leica Users Group' Subject: RE: [Leica] Focus shift on 50/1.4 Nikkor on M8 Just so we are all on the same page; you guys are setting the aperture, then focusing with the rangefinder, resulting in the described results? Cheers Hoppy -----Original Message----- From: lug-bounces+hoppyman=bigpond.net.au@leica-users.org [mailto:lug-bounces+hoppyman=bigpond.net.au@leica-users.org] On Behalf Of Jeffery Smith Sent: Monday, 2 April 2007 06:33 To: 'Leica Users Group' Subject: RE: [Leica] Focus shift on 50/1.4 Nikkor on M8 I suppose that I should set up some sort of contraption to find the "soft spots" on all of my lenses. It would have been a prohibitive pain in the ass without the M8. But the test I ran on the Nikkor tells me that if I took a portrait of someone at 5' and at f/5.6, her eyes would be out of focus. For now, I think I need to decide which one of my 28's, 35's, and 50's will reside most of the time on my M8 and test them. Jeffery Smith New Orleans, LA http://www.400tx.com http://400tx.blogspot.com/ -----Original Message----- From: lug-bounces+jsmith342=cox.net@leica-users.org [mailto:lug-bounces+jsmith342=cox.net@leica-users.org] On Behalf Of Leonard Taupier Sent: Sunday, April 01, 2007 3:21 PM To: Leica Users Group Subject: Re: [Leica] Focus shift on 50/1.4 Nikkor on M8 Jeffrey, This is similar to what I see on the Noctilux. Your Nikkor is probably on the edge of a back focus point and then shifts at f4. I think most lenses focus shift somewhat. I just checked my 1.5 Summilux. 1.5 Very soft. just out of focus. front focus. some flare. 2.0 Soft (low contrast). just in focus. still front focus. 2.8 -> 16. In focus. sharpens up nicely. focus in center of DOF. Len On Apr 1, 2007, at 3:25 PM, Jeffery Smith wrote: > Well, I wasn't expecting this. Shooting a copper wire about 5 feet > from me with the M8 and 50/1.4 Nikkor LTM: > > 1.4 In focus but soft > 2 In focus > 2.8 In focus > 4 Slightly out of focus > 5.6 Even more of of focus(!) > 8-22 In focus > > Optics guys, is this a reasonable result? > > > > Jeffery Smith > New Orleans, LA > http://www.400tx.com > http://400tx.blogspot.com/ > > > > _______________________________________________ > 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 _______________________________________________ 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