Do we really benefit from ultra fast lenses?

Started 10 months ago | Discussions thread
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highwave
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Do we really benefit from ultra fast lenses?
10 months ago

I read this article

http://www.dxomark.com/index.php/Reviews/F-stop-blues

from DxO and just an honesty disclaymore here but I first saw it on the NEX forum

http://www.dpreview.com/forums/thread/3545800

Basically what DxO argues is that these hyper fast lenses don't really give you the light gathering advantage claimed and manufacturers gain up the ISO to give you a "virtual" ISO advantage. They suggest an F4 as being a good number to rely on.

I do seem to recall some voigtlander users here who showed the shutter speeds Vs. Aperture and it was as expected down to F1.4 but this is just off memory.

If anyone has personal experience in this matter, please chip in for those of us considering buying hyper fast lenses (F1.4 and larger).

 highwave's gear list:highwave's gear list
Olympus OM-D E-M5 Panasonic Lumix G 20mm F1.7 ASPH Panasonic Lumix G 14mm F2.5 ASPH Olympus M.Zuiko Digital 45mm 1:1.8 Panasonic Lumix G Vario 45-150mm F4-5.6 ASPH Mega OIS +3 more
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