I'm planning to have an Acute Matte D screen installed in my 500C, which I will use for general photography. (From a previous thread I've learned that this can be done by a skilled technician.) Initially, I was thinking of getting a 42215 screen, with split image and microprism. However, I now have the option of getting what appears to be a nice 42210 screen for about a third of the price of the 42215, which currently goes for USD 250-300 on eBay. Does anyone have a view on the difference between the two screens that may help me decide which one to get? Thanks!