I'm sitting here wondering about using the A mode with multiple segment
metering etc, and also realising we can analize this issue to death. The
bottom line of course here is how accurately are your photos exposed in real
life. The whole thing was designed to work together and to the best of my
Taz wrote:
T I'd like to here from others shooting slide
T film and their opinion of when using the A mode on the lense. What
T percentage of the time is the metering/exposure spot on for your slides?
T And which model of camera are you using for slides.
My MZ-5N overexposes slides in
Michel wrote:
MCG DX code don't contain slide or negative data, only:
MCG - Iso setting: 2-6
MCG - film length: 8-10
MCG - exposure lattitude: 11-12
Hi Michel,
The exposure latitude is good enough to make the difference between
slide and negative film. If it is 3 EV it's negative film.
Nice trick, Jostein.
The Sigma 70-200/2.8 is supposedly well built but still displays
the error. Too bad we cannot draw a lens-related conclusion. It
appears the mechanism itself requires very low tolerances both on
the camera and the lens and is very prone to error. :o(
The Sigma 70-200/2.8 is supposedly well built but still displays
the error. Too bad we cannot draw a lens-related conclusion. It
appears the mechanism itself requires very low tolerances both on
the camera and the lens and is very prone to error. :o(
Definitely. I don't think it has to do with the
PROTECTED]
To: [EMAIL PROTECTED]
Sent: Wednesday, March 12, 2003 9:43 AM
Subject: Re: Re[4]: Diaphragm actuator precision survey
The Sigma 70-200/2.8 is supposedly well built but still displays
the error. Too bad we cannot draw a lens-related conclusion. It
appears the mechanism itself requires
Jostein wrote:
Now, the _real_ question behind this is: how the heck can the camera
know the exact position of any one particular f/stop?
I think this has been discussed here on the list before, but it's got
to be at least two or three years ago, and I can't recall the
conclusion...
This is an
Jostein wrote:
J Now, the _real_ question behind this is: how the heck can the camera
J know the exact position of any one particular f/stop?
J I think this has been discussed here on the list before, but it's got
J to be at least two or three years ago, and I can't recall the
J conclusion...
From: Alin Flaider [EMAIL PROTECTED]
Think about A and up lenses - they all have electric contacts
whose
pattern tell the camera the absolute value of lens widest
aperture.
Now setting the actual aperture is a matter of setting the lever
position according to the difference
-A and up lenses have a series of contacts at the lensmount interface,
that correspond to areas of metal or plastic on the lens. This codes the
minimum and maximum aperture of the lens.
There is also a real contact on the lens to indicate whether the
aperture ring is set to the A position.
-Mat
Now, the _real_ question behind this is: how the heck can the camera
know the exact position of any one particular f/stop?
I think the trick lies behind the fact that the movement of the A/F/FA
lenses' diaphragm actuator is linear.
http://www.bdimitrov.de/kmp/technology/K-mount/Ka.html
regards,
Hi everybody,
Startled by a recent mention of bodies unable to precisely set the
diaphragm aperture, I conducted a small test to see for myself. Not
that I care much as I set the aperture from the lens most of the
time, but I wanted to know how reliable exposure is for those rare
Align
I hate to be the one to toss a rock in your gears but I see an inherent
problem with your theory. On most zoom lenses the f stop changes as you
change the zoom setting. Thus one reason why your testing proved better on
a 50 mm prime. You also list that your test was done successfully on
Taz wrote:
TIf the zoom is set on the shortest focal length then,
T and only then with the exception of some lenses that claim f stop stays the
T same, the cameras shown f-stop will equal what it says on the aperture ring.
T I guess I would question the accuracy of doing this type of test in this
Alin
How are they running the tests on the PZ-1 and PZ-1p's, which were the
cameras that were specifically mentioned as having this problem originally.
They have depth of field preview, but it is a manual function rather then
electronic, that only works with the aperature ring actually turned to
]
To: [EMAIL PROTECTED]
Sent: Tuesday, March 11, 2003 9:36 PM
Subject: Re: Re[2]: Diaphragm actuator precision survey
Alin
How are they running the tests on the PZ-1 and PZ-1p's, which were
the
cameras that were specifically mentioned as having this problem
originally.
They have depth of field preview
How are they running the tests on the PZ-1 and PZ-1p's, which were the
cameras that were specifically mentioned as having this problem originally.
I think the reason is that the Z-1p is the only body allowed the aperture to
be chosen through the bodies. With program or shutter priority mode, the
Well I'm glad you brought all this up as I've learned a bunch from all
this.
I tend to notice problems that I am not supposed to, or I don't want to. But
I do notice them somehow... :(
Is f11 to f13 a full or half stop?
1/2 I think? f11 f16 is 1 stop difference, f22 is another.
regards,
Alan
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