If shooting at f/22, is a fast 1.8 lens still considered fast?

Started Apr 17, 2011 | Discussions thread
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edwardaneal
edwardaneal Veteran Member • Posts: 9,101
one more

here is an article by Canon Europe on the advantages of large aperture lenses

http://cpn.canon-europe.com/content/education/technical/low-light-lenses.do

and a quote from their article

"The final advantage concerns the focusing. More light can be gathered by these lenses because of the larger maximum aperture making it easier for the autofocus sensors within the camera to find contrast even in low light or low contrast situations. Lenses with smaller maximum apertures may struggle to focus in such low light conditions as they cannot allow enough light into the autofocus sensors."

So I suppose you are now going to tell me that this is also wrong or that this is only true for some select Canon cameras with some special sensors that no other camera have.

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My kit - D200, 10.5mm f/2.8D, 35mm f/1.8G, 50mm f/1.4G & 70-300VR
SB800, SB600 and other misc lighting equipment

Lenses worth mentioning owned and sold– 12-24 f/4, 17-55 f/2.8, 35-70 f/2.8, 80-200 f/2.8, 20mm f/2.8, 35mm f/2, 50mm f/1.8, 50mm f/1.4D, 60mm f/2.8D, 85mm f/1.8, 105mm f/2D-DC, 180mm f/2.8, 300mm f/4D-ED

 edwardaneal's gear list:edwardaneal's gear list
Sony Alpha NEX-7 Sigma 60mm F2.8 DN Art Carl Zeiss Touit 1.8/32
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