I have a Zeiss 5X loupe for viewing slide. I love it very much as it is sharp and bright..... Now I am looking for a higher magnification loupe to identify sharpness and select slide for 20"x30" print. I'm thinking of a 10 to 15X loupe..... There is a Schneider 10X loupe. Is there anyone can help to comment or give me other suggestions. Thanks.