In these weeks, thanks or due to the challenging SLR Sigma SD15, I’m brushing off the old notions of photography, dating back to the late 90s, on film SLR. I’m focusing in particular on the theme of sharpness, or rather the resolving power. — I then dived into the web, still a great resource, where in some personal blogs, and especially old forums of photography enthusiasts a bit ‘old school, I found the typical old discussions about the not importance of megapixels, the influence of the format and the related theme of the most…