Useing Find for metadata or EXIF data...

I am trying to isolate pictures of a particular subject (Nan) taken at ISO 800 in a particular directory. Find word ''Nan'' works well. I then created a quick collection with the results and then attempted to use either Find:metadata ''ISO 800'' or Find:Exif ''ISO 800'' neither worked and it felt as if Lightroom was going to crash on me: flashing white rectangle on the screen. What am I doing wrong?
Useing Find for metadata or EXIF data...
Peter-
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%26lt;br /%26gt;Presently there's no way I know of to search - via LR- ISO numbers. You might consider adding to request list!
%26lt;br /%26gt;You can search by lens, if that'll help narrow it down, as well as the obvious date, keywords, etc. If ISO is an importand search for you, you can enter it in keywords.
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%26lt;font br='''' /%26gt;%26lt;/font%26gt; color=''#600000'' size=''2''%26amp;gt;~~ John McWilliams
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%26lt;br /%26gt;MacBookPro 2 Ghz Intel Core Duo, G-5 Dual 1.8; Canon DSLRs