Wide open metering was developed partly to overcome the issue of meter
accuracy decreasing with decreasing light levels. In old camera manuals
there were charts showing what f stop shutter speed combinations would
allow proper metering. Those limitations haven't been removed. If you
manage with stop down metering to lower the light below the meters
threshold of accuracy you meter will recommend incorrect exposures.
However Ricoh is full of horse crap when they say that. K M aperture
mechanisms are quite accurate when used as designed and when kept clean
and properly lubed. However a lot of them are over 40 years old and
have never been serviced in their working lives. I expect a large
number of modern lenses mechanisms will be inaccurate or stop working
altogether if not serviced in less than 1/10th that time.
On 9/17/2014 9:52 PM, Zos Xavius wrote:
Ricoh claims that the aperture mechanism used in the M/K series is not
accurate. My experience with green button stop down metering tells me
that there might be something to that given the liberal amounts of EV
compensation I end up using with various lenses. Oddly wide open
meters fine with the green button. Hmmmm.
On Wed, Sep 17, 2014 at 9:44 PM, Mark Roberts
<postmas...@robertstech.com> wrote:
Mark C wrote:
I'd expect all A, F and FA lenses would work with a FF Pentax. That's a
lot of legacy glass. If they keep the green-button-stop-down-metering
feature, there is still compatibility with even older glass.
I'd like to see Pentax put more effort into attracting new buyers who
will want new lenses and leveraging that to rebuild the product line.
Investing in the very small number of people who bought lenses decades
ago and don't want to upgrade is not a good business strategy,
especially when your current products support this market segment better
than most of your competitors.
Yes, attracting new buyers is critical. The other day I was in Best
Buy picking up a USB cable or some such and walked through their
camera display. I found myself thinking how everything in there looked
the same and that the new K-S1 would really stand out. The old farts
that populate the PDML might not like it, but that's beside the point
in the wider world.
--
Mark Roberts - Photography & Multimedia
www.robertstech.com
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