[pure-silver] Re: Possible optical defect caused by hair or dust within lens?
- From: "Eric Neilsen Photo" <ej@xxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sat, 7 Nov 2009 12:32:39 -0600
Does the hair move around at all? or is it stuck to the glass. If it is in
the same place, then I'd look for a repeating mark in ALL images shot at the
same f stop. However, That looks a lot more like a processing flaw than a
light problem. A light block would make a light area on your neg. Lighter on
a neg, prints darker not lighter. EXTRA density, a lighter area on an RA4
print, can come from photo stabilizer or a kink from film loading. The
fairly regular shape also does NOT match the irregular shape of the hair.
You would also need to be stopped way down to focus that dirt or hair onto
the film plane.
Eric
Eric Neilsen
Eric Neilsen Photography
4101 Commerce Street, Suite 9
Dallas, TX 75226
www.ericneilsenphotography.com
skype me with ejprinter
_____
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Eric Nelson
Sent: Saturday, November 07, 2009 11:22 AM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Possible optical defect caused by hair or dust
within lens?
The photo showing the defect doesn't tell us it's orientation relative to
the film. Is the long mark running lengthwise? My first guess, since
you've not scanned the film yet, is a processing problem such as
stabilizer/final rinse marks. Scanning the film will tell u if it's a print
issue or film. You need more info to make any real guesses.
_____
From: Tom Kershaw <tom@xxxxxxxxxxxxxx>
To: pure-silver@xxxxxxxxxxxxx
Sent: Sat, November 7, 2009 8:05:28 AM
Subject: [pure-silver] Possible optical defect caused by hair or dust within
lens?
My posting on APUG hasn't generated anything by way of a response, and as
there isn't total overlap between pure-silver and APUG I thought I should
post here.
http://www.apug.org/forums/forum40/68152-odd-higher-density-marks-ra-4-print
-probably-optical-issue.html
and the image links:
http://www.tomkershaw.com/apug/rf645_65mm_hair.jpg
http://www.tomkershaw.com/apug/strange_mark_kp800.jpg
As the density marks do not appear to be visible in all prints from the
RF645 negatives and do not occur with my Bronica SQ negatives, perhaps the
hair which is within the lens generates the defect depending on the light
direction.
Tom
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