In reply to dek:
Plastic magnifiers available from magnifico.com
I use their credit size one attached by cord to the map case. Also keep one in my wallet for general use. They also do passport size cards as well for general planning. Magnifico are a very helpful company and made a pack of assorted sizes for me. Very good.
Drawback is when holding a map, holding a magnifier above the map and then trying to use compass.
I also use Memory Map and print out my 1:50 map at 1:25 scale.
On the topic of scale I also find it easier to use 1:50 in the hills rather than 1:25. There is so much information, lines, boulder fields on 1:25 that I find the countours get slightly lost.