Here's a link to my Bird of the Day if you haven't been there before, its well worth a look, I try to include some of my best photographs selected from my gallery of 6000 bird images.

If you are looking at the Blog today, directed here from the Pentax Forum, then you will be interested to know that  the photograph (below)  was  taken with my Pentax K3 to a Sigma 500mm f4.5 EX DG HSM. The Blackcap Warbler  was taken this morning  through the slightly hazy glass of my kitchen window so consequently it is not as dynamic or as sharp as it would have been had it not been taken through Pilkington K glass.

In the next photograph, I took my camera to the local marsh, this time connected to  my Pentax SMC DA* 300mm f/4 ED [IF] SDM.  I find this lens to be a wonderful piece of equipment.  Even with poor weather and bad light I was able to get a nice photograph of this flying Northern Shoveler Duck, albeit with huge crop.  Two massively different photographs and both good successful examples of the art of bird photography.