[LRflex] Re: Bizarre lens question - my test
- From: "Aram Langhans" <leica_r8@xxxxxxxxxxx>
- To: leicareflex@xxxxxxxxxxxxx
- Date: Fri, 04 Nov 2005 05:19:09 -0800
My results:
I metered a blank wall (for consistancey) with my R8, ISO 200.
180 Elmar at f-4 metered at 1/12 sec.
100 APO at f-4 metered at 1/15 sec.
90 Elmarit at f-4 metered at 1/15 sec.
180 at f-5.6 metered at 1/6 sec.
100 APO at f-5.6 metered at 1/8 sec.
90 Elmarti at f-5.6 metered at 1/8 sec.
All lenses consistantly changed metered shutter speeds as I stopped down or
opened up.
If the 180 is 1/2 stop below rating at f-4, it is also 1/2 stop below at all
the f-stops. It si not like it jumps back to match the others as you stop
down.
I did not take any photos. Maybe I"ll borrow the schools Digital Rebel when
it is available to me and repeat the test with my lenses to see if the
mirror Javier's results.
>From: "Aram Langhans" <leica_r8@xxxxxxxxxxx>
>Reply-To: leicareflex@xxxxxxxxxxxxx
>To: leicareflex@xxxxxxxxxxxxx
>Subject: [LRflex] Re: Bizarre lens question
>Date: Wed, 02 Nov 2005 13:04:41 -0800
>
>I await more responses to this. I have an Elmar but can't compare it to an
>Elmarit. Maybe tonight I'll slap it on the camera and meter a wall and
>then
>use my 100 at f-4 to see if it matches.
>
>As I was reading your post I was thinking that maybe there is a small
>fractional difference between the two that would cause one to be just below
>and the other to be jsut above where the display would show the next
>shutter
>speed, but you then did the correct experiment and shot at f-4 and said the
>Elmar was darker. Well done experiment.
>
>Aram
>
>
>
> >From: Javier Perez <summarex@xxxxxxxxx>
> >Reply-To: leicareflex@xxxxxxxxxxxxx
> >To: leicareflex@xxxxxxxxxxxxx
> >Subject: [LRflex] Bizarre lens question
> >Date: Wed, 2 Nov 2005 03:07:42 -0800 (PST)
> >
> >Hi Everyone
> >I was doing one on my usual meaningless lens
> >comparisons using my old DCS560 and something weird
> >happened. I decided to take a few tests shots to
> >compare 180s I rounded up the Elmarit the Elmar and a
> >CZJ auto Sonnar. Since the Elmar is slower I used F4
> >for all the lenses. With the 560 on aperture preferred
> >mode The Elmarit and the Sonnar both gave the same
> >shutter speed. But the Elmar indicated a slower speed
> >of about 1 increment. I shot the 3 pics and
> >illumination was about the same for all three. The
> >Elmarit was a tad sharper but not much. The Elmar was
> >about the same as the Sonnar. But the thing seemed
> >weird. All 3 lenses should have given near the same
> >shutter speed at the same F-stop. I do these fun tests
> >all the time just to see how bad, bad lenses really
> >are, and I've never once encountered a discrepancy
> >this big. I know that there are transmission ratio
> >differences, but again never this big. I redid the
> >test again on F4 on manual mode using the shutter
> >speed called for by the Elmarit and the Sonnar on all
> >3 lenses and went back to the computer. This time the
> >Elmar pic was noticeably darker! Anyway, if anybody
> >has an Elmarit and an Elmar I was hoping you might try
> >the test the things yourself. maybe you can come up
> >with a reason. Otherwise I'm going to conclude the
> >Elmar isn't really an F4!
> >Javier
> >
> >
> >
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