Thank you. I bought the RF 800 as my previous long lens weighed a ton, also I wanted to get rid of carrying a monopod or tripod. The fixed aperture of f11 does present problems but I've learned to work around them. When using the lens I have one of the camera user defined settings to -1 ev, ISO 1600 which seems to cover most eventualities. The DXO Photolab's Deep Prime facility does an excellent job in removing any small amount of noise.