All,
The citation we have been dancing about. Apparently the research was done
through the Getty, or at least published by them. Information on Terry
Schaeffer's book on this topic courtesy of Mr. Stefan Michalski, of the
CCI:
Terry's book reviews all the relevant literature, and makes
recommendations. I have cc'd Terry, but I think it fair to say that
although there is no disagreement on the evidence, ie reciprocity holds
reasonably well, and the rest is exposure arithmetic, our approach to
practical advice has a different spin: Terry's advice is a bit more
cautious than mine was, since it assumes the flash may often be of the
professional scale, ie hundreds of times more exposure than an amateur, and
it assumes a very small permissible fractional contribution from the flash.
I, on the other hand, had derived my advice in terms of museum visitor
flash (small power) and equally importantly, in terms of whether the flash
exposure would approach a similar contribution to that of "good" museum
display lighting in the 50-150 lux (5-15 ftcandles) range. Given my
assumptions, my advice becomes: visitor flash, and the occassional pro
flash, is never ever a preservation issue in the real museum world. (but
it is still annoying, and can break copyright laws and museum shop sales)
Given her assumptions, Terry's advice would be : take care, do a little
exposure accounting, sometimes you may have to limit flash exposure,
especially professional, if you want its contribution to be not just a
minority, but negligible compared to the light from normal display.
In any event, if you want a solid citation, you must get Terry's book.
Stefan
Source title.... Effects of light on materials in collections : data on
photoflash and related sources
Series title.... Research in conservation
Personal author. Schaeffer, Terry T.
Corp. author.... Getty Conservation Institute
City............ Los Angeles
Country......... xxu United States
Publisher....... Getty Conservation Trust
Date/pub........ 2001
Collation....... 211 p.
Something good to add to our libraries. BTW, if anyone is wondering,
reciprocity refers to the notion that light exposure is cumulative in the
long run.
Mark Janzen
Registrar/Collections Manager
Edwin A. Ulrich Museum of Art
Martin H. Bush Outdoor Sculpture Collection
Wichita State University
(316)978-5850
Sue Bodemer
<bodemers@ROCKWEL
LMUSEUM.ORG> To
Sent by: Museum [log in to unmask]
discussion list cc
<[log in to unmask]
SE.LSOFT.COM> Subject
Re: visitor photography in museums
06/02/2004 02:19
PM
Please respond to
Museum discussion
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but what about paintings and bronzes?
-----Original Message-----
From: Museum discussion list [mailto:[log in to unmask]]On
Behalf Of Steven Stewart
Sent: Wednesday, June 02, 2004 2:27 PM
To: [log in to unmask]
Subject: Re: visitor photography in museums
According to the CCI (Canadian Conservation Institute, have the specific
name of Conservator if you want) flash photogprahy has little to no
apparent damage to artifacts. Our main reason for not allowing flash
photography in our galleries is copyright issues that could arise and just
breaks the mood. However if we have a special function (rental, etc.) in
the space we allow flash providing that the owners of the objects in the
gallery have no problem with it.
The CCI did some extensive research into the conservation/preservation
question of flash photography trying to settle the issue once and for all
and could not find any significant reason to worry. I will find the
posting and pass it on to the list.
steven stewart
curator of collections and exhibits
customs house museum and cultural center
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