Author 'Boucher Marc dit de Meilh' (Id 216066 ) : Red-gorge familiar that I post and for the moment it will only be a single photo and in a reduced format. I photographed yesterday, other photos are interesting, but here it is... The tv is the TAMRON LD DI Macro 70-300mm, but then NO one on the plane CHROMATIC ABERRATION !!! It is not apochromatic and so, upon a grey sky the outlines of some of the branches, the end of branches and leaves sometimes become purple, blue or even red... which is dramatic and does not at all 'professional'. Someone could not tell me a free software to improve the chromatic aberration of these photographs ? (I didn't have a problem with the Sigma but he also has mechanical problems, recurrent ; crown training AF often fail...) In the waiting, I hope not too much to disappoint you and thank you for all guidance and suggestions. Ph : Marc de Meilhan.