On Tue, 17 Oct 2006, Kostas Kavoussanakis wrote:
> On Tue, 17 Oct 2006, Cory Papenfuss wrote:
>
> > I still think that's more confusing than what I'm thinking.
>
> All I am saying is that what you are thinking is "confusing"
> (user-unfriendliness is what I have experienced) and will not solve
> the problem.
>
> > How exactly do you get 6 EV?
>
> The camera meters at open no matter what you set the ring to. I set
> the ISO 3 stops darker than the desired exposure, so it overexposes by
> 3 stops. This means that open+3 is the actual correct exposure, thus I
> have 3 stops either side.
>
> Of course it's so user-unfriendly that I may have got the above wrong
> even in the description, so I quickly bought a -5n. I very frequently
> stopped down without fixing the compensation, and occasionally
> compensated the wrong way.
>
> The linkage is the only way to do it fully and properly.
>
Ah... missed the fact that you were talking about film bodies.
I'm talking about the DSLRs. Setting the ISO is automatically corrected
for by the body, so you can only do it if the lens is within 3 stops of
wide open.
As far as what I'm suggesting being confusing, it certainly is to
the uninformed. Of course, the GB hack is also confusing... especially
since it ONLY works in 'M' mode. I have proposed two possible
work-arounds that could be added as *additional* methods of using manual
lenses:
- Keep meter alive after GB trick, but the camera records the aperture
"offset" from wide open. Only after changing the aperture ring would
another hit of the GB be necessary.... could be mapped to the 'P' mode as
somewhat intuitive.
- Manually entering the max aperture and shooting aperture. Could be done
in a somewhat "user-friendly" way, and would be intuitive as an 'Av' mode.
Both of these are slightly different, and would definately take
some understanding on the part of the user. They are easily implementable
in addition to the GB hack, since that only works on 'M' anyway. They
also reduce some of the fundamental problems with the stop-down metering
of the GB hack:
- Open aperture metering. Stopped down in my proposed "P+" mode could be
done more accurately using *all* metering points in the camera, not just
CW... since the camera isn't metering to expose, just metering to
determine the difference between wide-open and stopped down. In my
proposed "Av+" mode, everything is set by the user, so all information
available for an 'A' lens is also known for the K/M (so long as the user
keeps the two synced).
- Continuous-metering. The only time adjustments have to be made or GB
needs to be pushed is when the aperture ring is moved.
- Split-prism focus aids aren't as debilitating of a metering problem.
The center meters could be ignored when operating in my "P+" mode.
All of this sounds more confusing than it actually is.
-Cory
--
*************************************************************************
* Cory Papenfuss, Ph.D., PPSEL-IA *
* Electrical Engineering *
* Virginia Polytechnic Institute and State University *
*************************************************************************
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