Archived posting to the Leica Users Group, 2012/06/10
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I do that, Jay, but I don't like surprises. However, with the Olympus DSLR bodies that I use, the manual Leica-R lenses that I use seem to work fine. I had heard stories about problems with the products of some other manufacturers, and wanted to prove to myself that those did not apply to my gear. I'm quite happy with the measurements that I made today. Jim Nichols Tullahoma, TN USA ----- Original Message ----- From: "Jayanand Govindaraj" <jayanand at gmail.com> To: "Leica Users Group" <lug at leica-users.org> Sent: Sunday, June 10, 2012 11:14 PM Subject: Re: [Leica] Using M (and R) glass on a Sony NEX-7 Now DATA > Jim, > Shoot RAW. Get the exposure compensation right BEFORE the bee comes! > Cheers > Jayanand > > On Mon, Jun 11, 2012 at 9:34 AM, Jim Nichols > <jhnichols at lighttube.net>wrote: > >> Hi Jayanand, >> >> That is all well and good, but the bee may be gone before the second shot >> can be made. That is why I like to get the first one right. ;~) >> >> >> Jim Nichols >> Tullahoma, TN USA >> ----- Original Message ----- From: "Jayanand Govindaraj" < >> jayanand at gmail.com> >> >> To: "Leica Users Group" <lug at leica-users.org> >> Sent: Sunday, June 10, 2012 10:52 PM >> >> Subject: Re: [Leica] Using M (and R) glass on a Sony NEX-7 Now DATA >> >> >> Why does all this matter? Look at the histogram and adjust! Digital >> makes >>> it so easy to get a good exposure.... >>> Cheers >>> Jayanand >>> >>> On Mon, Jun 11, 2012 at 1:15 AM, Jim Nichols <jhnichols at >>> lighttube.net>** >>> wrote: >>> >>> Aram, >>>> >>>> I will add to the confusion. >>>> >>>> After plotting your data on the NEX-7, I became curious about my >>>> Olympus >>>> E-1, which is an early professional model. I compared the companion >>>> lens, >>>> which was the Olympus 14-54 zoom, to my Summicron-R and my Elmarit-R >>>> 60mm >>>> Macro. By some stroke of luck, I was able to use a log scale for this >>>> one, >>>> which helps with the comparison. I have tried to do the same for my >>>> first >>>> chart of your data, but can't find that option again. >>>> >>>> If the 14-54 lens, which communicates with the camera, is taken as the >>>> "standard", then my Elmarit-60 is not too far off this line. However, >>>> my >>>> sample of the Summacron-R 50mm shows that it departs from the norm, >>>> particularly above f/8. In your data, this departure starts at about >>>> f/5.6. After seeing this, I would not choose the Summicron-R as a >>>> measure >>>> of performance for a Leica prime lens. My Elmarit-R 60 looks much >>>> better. >>>> >>>> In looking at your data for the Leica zoom, I begin to wonder if there >>>> are >>>> too many compromises in zoom lens design. I did not pursue recording >>>> the >>>> 14-54 data at other focal lengths. >>>> >>>> Jim Nichols >>>> Tullahoma, TN USA >>>> ----- Original Message ----- From: "Aram Langhans" >>>> <leica_r8 at hotmail.com >>>> > >>>> To: "Leica Users Group" <lug at leica-users.org> >>>> Sent: Sunday, June 10, 2012 11:00 AM >>>> Subject: Re: [Leica] Using M (and R) glass on a Sony NEX-7 Now DATA >>>> >>>> >>>> That's what I mean, too, except the Nikon D7000 and D300 does not >>>> behave >>>> >>>>> the same as Howard's D700. >>>>> >>>>> Can anyone make sense of these data? >>>>> >>>>> Lens 1 is Nikon 50/1.2 >>>>> Lens 2 is Leica-R 50/2 Summicron >>>>> Lens 3a is Leica-r 35-70/4 shot at 35mm >>>>> Lens 3b is same lens shot at 50mm >>>>> Lens 3c is same lens shot at 70mm >>>>> >>>>> Subject, an evenly lit patch of grass in my front lawn. Went through >>>>> the >>>>> f-stops twice for each lens to check consistency. Same reading each >>>>> time. >>>>> >>>>> >>>>> f-stop Lens 1 Lens 2 Lens 3a Lens >>>>> 3b >>>>> Lens 3c >>>>> 2 1600 1600 >>>>> 2.8 800 1000 >>>>> 4 400 400 640 500 640 >>>>> 5.6 200 100 160 200 320 >>>>> 8 100 40 50 60 100 >>>>> 11 50 25 30 30 50 >>>>> 16 25 15 20 20 20 >>>>> >>>>> As you can see, the Nikon behaves as it should be and meters correctly >>>>> through the f-stop range, halving the shutter speed for each smaller >>>>> f-stop. >>>>> The Leica lenses do not and progressively overexpose as you stop the >>>>> lens >>>>> down. I am surprised that the zoom did not meter correctly wide open. >>>>> In >>>>> my field experience, wide open is not a problem, and the overexposure >>>>> only >>>>> starts to show up as you stop down. >>>>> >>>>> I am also surprised that the overexposure is limited to about one >>>>> stop. >>>>> In my field experience I sometimes have to compensate about 2 stops. >>>>> >>>>> That said, there is about a one stop overexposure in this test while >>>>> my >>>>> Canon, when I had it, would overexpose about 4 stops if you stopped >>>>> down >>>>> enough. >>>>> >>>>> >>>>> >>>>> >>>>> ------------------------------****-------------------- >>>>> >>>>> From: "H&E Cummer" <cummer at netvigator.com> >>>>> Sent: Sunday, June 10, 2012 6:04 AM >>>>> To: <lug at leica-users.org> >>>>> Subject: [Leica] Using M (and R) glass on a Sony NEX-7 >>>>> >>>>> >>>>> Date: Sat, 9 Jun 2012 16:13:38 -0600 >>>>>> From: Bill Nelsch <photobynelsch at gmail.com> >>>>>> Subject: Re: [Leica] Using M (and R) glass on a Sony NEX-7 >>>>>> To: Leica Users Group <lug at leica-users.org> >>>>>> >>>>>> I have a stupid question: When you say the D7000 is "linear" - what >>>>>> does >>>>>> that mean actually? How does that affect the exposure? >>>>>> >>>>>> Bill in Denver >>>>>> >>>>>> Hi Bill, >>>>>> By linear I mean that as you close down the lens aperture the shutter >>>>>> speed drops by an equal amount in terms of light transmission >>>>>> If you are at f5.6 and 1/500 and then close down to f8.0 the shutter >>>>>> speed adjusts to 1/250 - to f11.0 the shutter speed drops to 1/125 >>>>>> keeping the light transmission the same. That's what happens on the >>>>>> Nikon. On the Canon without Canon lenses that "talk" to the body >>>>>> as you close down a Leica R lens mounted with an adapter that isn't >>>>>> chipped the shutter speeds drift away from the above response and you >>>>>> get >>>>>> more and more exposure variation. >>>>>> Hope this clarifies my point for you. >>>>>> Cheers >>>>>> Howard >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> ______________________________****_________________ >>>>> Leica Users Group. >>>>> See >>>>> http://leica-users.org/****mailman/listinfo/lug<http://leica-users.org/**mailman/listinfo/lug> >>>>> <http://**leica-users.org/mailman/**listinfo/lug<http://leica-users.org/mailman/listinfo/lug>>for >>>>> more information >>>>> >>>>> >>>>> >>>>> >>>> >>>> ______________________________****_________________ >>>> Leica Users Group. >>>> See >>>> http://leica-users.org/****mailman/listinfo/lug<http://leica-users.org/**mailman/listinfo/lug> >>>> <http://**leica-users.org/mailman/**listinfo/lug<http://leica-users.org/mailman/listinfo/lug>>for >>>> more information >>>> >>>> >>> ______________________________**_________________ >>> Leica Users Group. >>> See >>> http://leica-users.org/**mailman/listinfo/lug<http://leica-users.org/mailman/listinfo/lug>for >>> >>> more information >>> >>> >>> >> >> >> ______________________________**_________________ >> Leica Users Group. >> See >> http://leica-users.org/**mailman/listinfo/lug<http://leica-users.org/mailman/listinfo/lug>for >> >> more information >> > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > >