confused about exposure

[emrah.bostan@epfl.ch]

hi,

first of all, i want to thank everyone has contributed to this forum. i have been following this forum for six months and finally i got my first rangefinder camera; M7.

i was planning to buy a lens later on but one of my friends offered his 28mm Voightlander Ultron f1:1.9 for free. He mounted the lens without an adapter and said that wouldn't be a problem. Now, here comes my question:

After i got home, for the same scenario, i was reading different exposure displays from my leica and my nikon fa(with a 28mm lens). for instance, with leica, the display was 4 and with nikon the display was 2(Both in AE mode). Is it normal? And also, does using this lens without an adapter cause any problem? How can i be sure that my m7 is measuring the exposure properly?

actually, i am quite younger than most of you which means i need more advice.

thanking you

 

[Mack]

Don't worry too much.
No two cameras meter in exactly the same way.
Shoot a test roll with your M7 and see how it turns out.🙂

 

[uhligfd]

Well, were both cameras set to the same ISO value? Was the M7 set to the same aperture as the FA? Then the times should be nearly identical ... (if no exposure compensation was set on both cameras, of course.)

 

[rlouzan]

He mounted the lens without an adapter and said that wouldn't be a problem.

Imposible, the 28mm Voightlander Ultron f1:1.9 is a LTM lens.

for instance, with leica, the display was 4 and with nikon the display was 2(Both in AE mode). Is it normal?

Yes

 

[emrah.bostan@epfl.ch]

yes i forgot to mention that both cameras were set to same ISO value, aperture values were same as well and there were no exposure compensation.

 

[rlouzan]

Light transmission problem

Well, were both cameras set to the same ISO value? Was the M7 set to the same aperture as the FA? Then the times should be nearly identical ... (if no exposure compensation was set on both cameras, of course.)

 

[emrah.bostan@epfl.ch]

He mounted the lens without an adapter and said that wouldn't be a problem.

Imposible, the 28mm Voightlander Ultron f1:1.9 is a LTM lens.

i know the lens i screw mount but it is now mounted. 🙁

 

[Hector Negron]

You jammed a screw mount lens into the M7 without an M adapter and it stays in place and focus works?

Something is wrong with this picture.

Are you sure an M adapter wasn't already on your M7 when you bought it?

 

[Rogrund]

There must be an adapter. How do you dismount the lens? Is the lens perhaps the Ultron 28/2 (which is M mount)?

 

[Hector Negron]

Can you post a photo of the lens and the mount? Also the front of the M7?

 

[emrah.bostan@epfl.ch]

You jammed a screw mount lens into the M7 without an M adapter and it stays in place and focus works?

Something is wrong with this picture.

Are you sure an M adapter wasn't already on your M7 when you bought it?

yes exactly. when i mount it, i hear a ''click''. focussing works :S may be i should take pictures of the lens and the camera, you might be of more help.

 

[Hector Negron]

Take off the lens and look at the rear of it.

Is the mount threaded like a big screw or is it bright metal with machined "claws"?

 

[emrah.bostan@epfl.ch]

it is exactly like in this picture

http://www.kenrockwell.com/voigtlander/images/28mm-f19/D3S_5898-1200.jpg

 

[Gabriel M.A.]

actually, i am quite younger than most of you which means i need more advice.

But you don't need your wife's permission 😀

 

[emrah.bostan@epfl.ch]

oh apparently, there is an adapter on my lens so i feel like an idiot 🙂 my apologies...

 

[Roger Hicks]

Garry Coward-Williams, editor of Amateur Photographer magazine before the current incumbent Damien Demolder, has often been known to muse on the fact that while meters and metering techniques vary widely, most people get good or even excellent exposures. Mere latitude is not explanation enough. Neither of us has ever met anyone who could produce an explanation that satisfied us.

Cheers,

R.

 

[squirrel$$$bandit]

I think you should just take your photos and not worry about it. If all the pictures are exposed wrong, then you can worry, but I bet they will be fine. I use my M7 almost exclusively in AE mode and it seems to meter extremely well, and (my opinion, contrary to that of many), exposure compensation is a snap.

 

[wilonstott]

Its the metering pattern. FA uses matrix metering, and the M7 uses a (for lack of better term) a tightly cropped center-weighted meter--somewhere in between your average center-weighted meter and a spot meter. The FA, via matrix metering, takes in the entire scene, and the M7 meters what the 90mm frame lines see (respectively). Thus, 18% grey (or thereabouts) is measured from inside the 90 framelines or the M7, and the FA averages the exposure based on computed limits (a smart center weight if you will). With the M7, it depends on what you point it at, and what your 18% grey should be. I'm not 100%, but provided both cameras are working as they should, I bet thats the problem.

 

[David William White]

I've been waiting for someone to tell you that you need a third camera, and quick!

 

[emrah.bostan@epfl.ch]

Its the metering pattern. FA uses matrix metering, and the M7 uses a (for lack of better term) a tightly cropped center-weighted meter--somewhere in between your average center-weighted meter and a spot meter. The FA, via matrix metering, takes in the entire scene, and the M7 meters what the 90mm frame lines see (respectively). Thus, 18% grey (or thereabouts) is measured from inside the 90 framelines or the M7, and the FA averages the exposure based on computed limits (a smart center weight if you will). With the M7, it depends on what you point it at, and what your 18% grey should be. I'm not 100%, but provided both cameras are working as they should, I bet thats the problem.

oh i was thinking that FA used center-weighted meter by default and matrix metering could be activated by pushing a little button under the timer. thanks for the clean explanation.