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Photo Forum / Film Photography / Other Equipment / February 2005

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Double Image with spot meter

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jokke - 18 Jan 2005 14:02 GMT
Hi,

I just bought a Capital SP-II digital spot meter of which I'd like to
ask a few questions.

When viewing relatively bright spots like indoor lights etc. I seem to
get a double image in the top of the view. I guess it's there all the
time but distinguishable only when viewing bright subjects with quite
high contrast. I paid "only" 250 euros for it but nevertheless it came
with a six month guarantee. Is the double image just a feature of a
cheap meter or something repairable?

I also get a glare in the view circumference when pointing the meter at
lights, but I think the glare might be only at the viewing loop. It
seems to be impossible to affect the glare with a cardboard tube (read
toilet roll) without vignetting.

Are the things mentioned above just features whose actual effect on my
metering I just need to learn to negate? I also saw an analogue Pentax
meter at the shop, I think it was a Pentax V, and I should be able to
exchange my meter for it. I was told though that it's a pain to get
batteries for the Pentax meter and there should be no pros in choosing
it over the Capital.

Thanks for all who reply

Cheers

Antti
wilt - 13 Feb 2005 22:39 GMT
I think you are seeing reflections from one optical surface to another
because the lens elements are not coated to minimum such reflections.
So light is bouncing around inside the lens assembly instead of passing
thru the air-to-glass interface and getting to the sensor on the first
pass.  Readings can be affected by internal lens flare.  How much...it
depends!

--Wilt
JPS@no.komm - 14 Feb 2005 01:39 GMT
>I think you are seeing reflections from one optical surface to another
>because the lens elements are not coated to minimum such reflections.
>So light is bouncing around inside the lens assembly instead of passing
>thru the air-to-glass interface and getting to the sensor on the first
>pass.  Readings can be affected by internal lens flare.  How much...it
>depends!

I would doubt that the readings are affected much.  If you look at a
white paper dot against a dark grey background, and then the dot is
doubled, then youmay have a problem.  If it's from a narrow light
source, the main image could be hundreds of times as bright as the
double.
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