A few nice digital photos images I found:
Orange on Blue
Image by fs999
Pentax K-5 • 640 ISO • Pentax DA* 50-135mm F2.8 SDM
Hoya Pro1 Digital Filter Close-Up N°3
Green, Orange 'n White
Image by fs999
Pentax K-5 • 1280 ISO • Pentax DA* 200mm f:2.8 ED SDM
Hoya Pro1 Digital Filter Close-Up N°3
