kweber at UV1.IM.MED.UMICH.EDU
Tue Jul 12 08:40:12 EST 1994
I have two questions regarding optical filters.
1. Traditionally we have used a 405bp filter and a 350 lp (after a 550dl) for collection
of short and long indo1 wavelengths. It has been suggested to me that we use a 395+/-5nm
for short and a 525bp for long. Any opinions?
2. How long do filters last? I read in Dr. Shapiro's book that this is a very individual
thing and each filter must be inspected periodically, but is there an outer limit? We have
filters that we are using that are 7-10 years old. Is this unreasonable? They don't look
hazy, but I just wonder if the coatings can degenerate in such a way that would not be
visible to my naked eye. I have not noticed problems, but I wonder if I would necessarily
notice a problem with beads or such.
Thanks in advance.
PS Thanks to all who offered suggestions on the platelets. I should be able to try a lot
of them within the next month.
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