are you referring to the squirrel pics? Agree re size, but this forum will not allow hi res pics to be posted. as per Mike Atkinson's advice, went to local lake, the weather was overcast, so tried various settings, one of the best (IMO) was this Mallard duck.
I have not managed to master cropping in PS, use Ulead Photoimpact for cropping & resizing - although I find its enhancement tools pretty useless, and the size of what is saved seems at varience with what it states - the stated resolution was 1,000kb, it actually is 136kb
So it appears I am on the right road with the Sigma, have set my sights on a Canon 100 - 400 and Fuji XS1, but currently do not have any avaliable funds for more camera equipment, the reason I brought the Canon 500 was that it was listed on eBay under 35mm film cameras, and attracted only a few bids - from £199 to £255. Browsing listings its amazing how poor quality some listings are to the point of "well, I don't know what this is, so don't ask" re an old camera lens which has the make and focal length clearly marked