When matting and framing your large format, landscape photograph of the Great Smoky Mountains National Park ask for acid free backing materials and for museum glass that reduces light reflection. Museum glass is more expensive, but it is worth it especially if you place the large format, landscape photograph in a sunny room. Ask to see the difference before deciding.

Photo above: The Chimney's - Late Spring

Tip: Using a mat is a choice of personal taste, however, by not using a mat it will reduce the cost of using the museum glass. If making a choice between the two I would choose the museum glass.