[Yakim]

[quote name='wim' timestamp='1281614078' post='1712']

Hi Yakim,



Thanks for that info! Never too old to learn <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='' />.



Actually, close focusing robs one of as much light as extension tubes do, at the same magnification anyway, as this is directly related to magnification, and nothing else. This is even true with close-up lenses, although it isn't as obvious with those, due to the shortening of the FL they cause for the system as a whole <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='' />.



The amount of light you lose is exactly the same at the same magnification, whatever lens you use.



Kind regards, Wim

[/quote]



With all due respect, I seriously doubt that.



http://photo.net/canon-eos-digital-camera-forum/00Wuji