Margaret,

Many years ago when I did all the photography for the department I used a
filter "dydim or diadim" which gave much better results to colour
photography using a T64 Kodak Professional colour film.  I am not sure if it
will be the same for digital cameras, I purchased this filter from a
microscope supplier, however I believe that any photographic store should
have them.

Bill Sinai
Laboratory Manager
Tissue Pathology, ICPMR
Westmead NSW 2145
Australia
Ph 02 9845 7774


-----Original Message-----
From: histonet-bounces@lists.utsouthwestern.edu
[mailto:histonet-bounces@lists.utsouthwestern.edu]On Behalf Of Margaret
Blount
Sent: Friday, 23 July 2004 5:59 PM
To: 'Geoff McAuliffe'; Margaret Blount
Cc: Histonet (E-mail)
Subject: RE: [Histonet] Microscope filters


Dear Geoff,

Thanks, that is a great help. My colleague isn't actually using film as he
has a digital camera, but I will do a s you suggest and contact the
microscope manufacturers for trial samples. I can easily pop into Jessops
any time.

Thanks again

Margaret

-----Original Message-----
From: Geoff McAuliffe [mailto:mcauliff@umdnj.edu]
Sent: Thursday, July 22, 2004 7:44 PM
To: Margaret Blount
Cc: Histonet (E-mail)
Subject: Re: [Histonet] Microscope filters


Hi Margaret:

    Assuming your colleague is using black and white negative film, a
blue filter will pass more blue light to the film and give more density
in the negative. When printed, that will translate to the blue subject
being lighter on the print. That said, there are lots of blue filters
used in photography and some trial and error may be needed. There are
lots of different "daylight filters", depending on the light source and
the amount of correction needed, an 80A filter might be blue enough for
your application. The standard blue filter for making RGB separations is
a #47 and it is a fairly dense blue-purple color. A #46 is very similar.
Such filters are sold in photo stores that cater to professional
photographers (Jessop's in the UK is one) but you might be able to find
something in the AudioVisual dept at your institution or perhaps the
manufacturer of your microscope might loan you several for a trial, you
could then purchase the one that fits your needs.

Geoff

Margaret Blount wrote:

>Hi all,
>
>I have a chinese colleague who requires a blue filter to suppress staining
>for Nissl substance (violet) in brightfield transmitted light microscopy -
>does anyone know what filter this is and a supplier of such a filter. So
far
>I have only identified a Daylight filter, but I am not sure if this would
do
>the trick or not. If anyone knows anything about this I would be very
>grateful as would my colleague.
>
>Thanks in anticipation.
>
>Margaret
>
>Margaret Blount
>Chief Technician
>Clinical Biochemistry
>University of Cambridge
>Addenbrooke's Hospital
>Hills Road
>Cambridge
>CB2 2QR
>
>
>_______________________________________________
>Histonet mailing list
>Histonet@lists.utsouthwestern.edu
>http://lists.utsouthwestern.edu/mailman/listinfo/histonet
>
>
>

--
--
**********************************************
Geoff McAuliffe, Ph.D.
Neuroscience and Cell Biology
Robert Wood Johnson Medical School
675 Hoes Lane, Piscataway, NJ 08854
voice: (732)-235-4583; fax: -4029
mcauliff@umdnj.edu
**********************************************



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