Вот, я в Сети нашёл как раз по обсуждаемому поводу следующую инфу:
What is annoying about the EOS series is that they do not support AF focus confirmation with manual focus lens adaptors. This is unlike the Pentax and Nikon digital cameras which retain that feature with manual focus lenses. This is a serious issue since the plain ground-glass focusing screens in most AF cameras are not suitable for accurate manual focusing as they do not have split-prism or other focusing aids built into them.
OK, so I thought I was intense about cameras, but some folks in Germany have hotwired an EOS-M42 adaptor with the electronics from an EF35-70 lens to get an adaptor which supports MF focus confirmation. Nuts!
http://www.photoethnography.com/Classic....inFrame
единственное, чего я не нашёл в этой инфе, так это ссылку, откуда была заимствована информация об этих немецких кулибиных.
Может, кто что про это где-то читал?