[LRflex] Re: 100 APO - now Canon 5D - now EOS Metering

  • From: "Aram Langhans" <leica_r8@xxxxxxxxxxx>
  • To: <leicareflex@xxxxxxxxxxxxx>
  • Date: Sat, 20 Mar 2010 07:42:23 -0700

Richard.

You say you are using compensation when in automatic exposure mode, so I 
guess you know the situation does exist.  If you are always shooting at some 
set of f-stops, say 2 stops down, then this will work because you know what 
to expect.

If you want an experiment to see how much the effect is, try this.  Set your 
camera up on some scene and with your manual lens in place, dial in the 
largest f-stop you have, say f-2.  Set your camera to the "A" mode and dial 
in a neutral compensation (0 +/-).  Take the picture.  Then, take a series 
of exposures by stopping the lens down a stop at a time, f-2.8, f-4, 
f-5.6.... to f-16 or 22 and do not change any settings on the camera.  If 
all was working as logic would dictate, the camera will change the shutter 
accordingly, say from 1/500 to 1/250, 1/125... to achieve the same exposure. 
Now, go look at what you've got.

On my Rebel, each successive exposure will get more and more underexposed as 
the meter fails to compensate correctly for the manual lens.  Of course, if 
you do this with an EOS mount lens, all is well.  The camera will behave 
just like logic dictates.

Of course, you have some leeway in correcting this problem in RAW mode, but 
don't.  Just look at the images as the camera has captured them.  Or shoot 
JPEG for this test.

Try this and let us know how the 20D performs.

If you have found a successful way to deal with it, and it sounds like you 
have your system, then that is just fine.  I have found my way to deal with 
it, too.  In lieu of a Leica R-10D, this is the option I choose.  I do not 
want more of a crop factor, so I am not going the Olympus route.  I do not 
want to change my lens mounts at this time since I still will shoot B&W in 
my R8 for a while, so Nikon is out.

So, I deal with it and complain a bit, but the joy of the results with my 
Leica lenses is my compensation.

Aram

PS.  Lover your "10 kinds of people" signature.

--------------------------------------------------
From: "Richard Ward" <ilovaussiesheps@xxxxxxxxx>
Sent: Friday, March 19, 2010 7:16 PM
To: <leicareflex@xxxxxxxxxxxxx>
Subject: [LRflex] Re: 100 APO - now Canon 5D - now EOS Metering

> Pardon if I'm kicking over a nest of digger bees or something, but just 
> how explicitly significant is this issue? Maybe I just haven't found the 
> right situation of ruined images yet, but I've got some nagging doubts 
> about how much of a deal breaker this issue is.
> Over about a 12month span and probably a 1,000 images, I shot with a Zeiss 
> Pancolar M42 mount Fifty on my 20D quite successfully with the EOS 'Alien 
> Lens' Metering Feature/Failure. I shot high school baseball with jpegs and 
> pre-metering fixed exposure and auto-exposure as well (with compensation 
> dialed in), I shot dogs romping at a 'free-range' type kennel, portraits, 
> low light stuff, quite the range. I've shot about the same number of 
> frames with my 20D and 50 Summicron & 90 Elmarit tandem, but that included 
> a lot of redundant frames to compensate for physical frailties punting 
> sharpness and just plain compositional puttering. Still getting my legs 
> with those two lenses. but I digress...
>
> I have for dang sure seen my cameras meter/exposure system being 
> inaccurate. Stone cold 100% valid as a Fact of Life, but with a bit of 
> experience, experimentation, and occassional histogram chimping, I'm not 
> having much issue at all living with it.
>
> In Utter Sincerety, I would love to fully understand this EOS metering 
> inaccuracy problem as presented from an imagemaking (or operational) stand 
> point. I'm mainly a RAW guy, so maybe in creatively approaching converting 
> them, I've just not seen the 'failings' because they were 'masked' by 
> variations in scenes, content, and user manipulations of the files. I also 
> haven't seen failures in my jpegs, but maybe the above variables threw me 
> off the scent of catching the issue - was definitely preoccuppied with 
> whether those action shots had caught 'the moment' or not - could have 
> been that, too, I guess.
>
> Or how do I set up a 'static' shot so I can produce this failing myself of 
> the metering?
>
> I sometimes wonder if the center-weighted sameness of my minoltas I 
> learned to understand and to rely on their unreliabilities by accounting 
> for them situationally makes this EOS metering 'feature' just background 
> noise to the way I learned how to shoot.
>
> Thanks for any comments and inputs,
> Richard in Michigan
>
> Where we're trading 70's and Sunny for 30's and Snow just in time for the 
> weekend!
>
>
>
>
> ________________________________
>
>
> There are 10 kinds of people in the world - those who understand binary 
> and those who don't!
> _________
>
>
> Nothing is really work unless you would rather be doing something else.
> - James M. Barrie
> ________________________________
>
>
>
>
> ________________________________
 

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