Archived posting to the Leica Users Group, 2012/06/10
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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 >