After a long day's spotting of mainly shed's (typical of my spotting trips anyway) couldn't you just do with one of these....? 
http://cgi.ebay.co.uk/EWS-STRESS-RE...Z6552186635QQcategoryZ130QQrdZ1QQcmdZViewItem

http://cgi.ebay.co.uk/EWS-STRESS-RE...Z6552186635QQcategoryZ130QQrdZ1QQcmdZViewItem