I assume you'll be taking 75> through Detroit and up to big Mac. Along the way but some what off course are two shops.

Adray Camera 20219 Carlysle St, dearborn michigan.
Take 75n to 94e to outerdrive north and then to Carlysle
google map: http://maps.google.ca/maps?q=%202021...=1&sa=N&tab=wl

a bit north in pontiac you'll find
Camera Mart, Inc
11 South Telegraph, Pontiac, MI 48341

Take 75n to M59 (huron drive) west to telegraph.

Google map: http://maps.google.ca/maps?q=11+Sout...num=1&ct=title