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Path: utzoo!watmath!watdcsu!herbie
From: herbie@watdcsu.UUCP (Herb Chong, Computing Services)
Newsgroups: net.rec.photo
Subject: Re: Dingy colors...bad lens?
Message-ID: <590@watdcsu.UUCP>
Date: Thu, 1-Nov-84 00:37:44 EST
Article-I.D.: watdcsu.590
Posted: Thu Nov  1 00:37:44 1984
Date-Received: Thu, 1-Nov-84 05:38:29 EST
References: <20900009@uiucdcs.UUCP>
Organization: U of Waterloo, Ontario
Lines: 26

Knowing that Sigma is a reasonably reputable manufacturer, I would tend
to discount the lens as the source of you colour-balance problem directly.
It is possible that flare and other minor aberations in your lens is causing
colors to get muddled together, leading to a muddy appearing image. Zoom
lenses are more prone to this because they have more elements in them.
You do not state whether this has occured with any other lens you own.
It is possible that the film you used was improperly stored and caused
colour shifts. It is also possible that the lab processing your film had
a bad day.  Muddy colours also can occur with badly underexposed film, but
this is easily diagnosed by almost pure orange negative and lots of grain
in the print.  If colours appear to have mixed in from other parts of the
picture (most noticeable in light colours), it is possible that you are just
getting reflected light that is coloured.  Without actually examining
your negatives and prints, it is very difficult to do more than speculate.
It is slightly possible that the aperture coupling to your camera is not
accurate and you are consistently underexposing every picture you take
with that lens.

Herb...

I'm user-friendly -- I don't byte, I nybble....

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