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Thanks to all who responded. My problem was overheads that have problems that have either shades of blue at the top and/or shades of brown at the bottom. One also does not focus at the bottom if the top is in focus. The consenus was that either the mirrors maybe out of alignment or the fresnal lens might be warpped. Other ideas were turning the plastic/glass surface over ...not having them facing the right way may cause problems... all of the reflective surfaces -- inside & out -- are perfectly clean & scratch-free fresnel lens is not seated properly lens may be in upside down or someone may have used ammonia based cleaner on it. When overhead moved back further from screen that blue and yellow effect was corrected (this was true in my case also) I still do not have them fixed, but thanks to you folks, have narrowed down the list of possibles. -- ++++++++++++++++++++++++@@@@@@@@+++++++++++++++++++++++++++ Ron McAtee, Media Specialist email: rmcatee@netnitco.net Kankakee Valley High School http://165.138.231.2 Wheatfield, IN 46392 219.956.3143 ext. 209 ++++++++++++++++++++++++@@@@@@@@+++++++++++++++++++++++++++ =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-==-= All postings to LM_NET are protected under copyright law. To quit LM_NET (or set-reset NOMAIL or DIGEST), send email to: listserv@listserv.syr.edu In the message write EITHER: 1) SIGNOFF LM_NET 2) SET LM_NET NOMAIL or 3) SET LM_NET DIGEST 4) SET LM_NET MAIL * Please allow for confirmation from Listserv For LM_NET Help & Archives see: http://ericir.syr.edu/lm_net/ =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=