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2 General SLR lens questions

TristanPTristanP Registered Users Posts: 1,107 Major grins
edited October 28, 2005 in Cameras
1. Does the viewfinder brightness depend solely on the max aperture of the lens?

2. Will using a lens designed for full frame cameras that has less brightness and corner sharpness perform "better" on the 20D/Rebel since the imaging circle is smaller?
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Canon 20D | 10-22 | 17-85 IS | 50/1.4 | 70-300 IS | 100/2.8 macro
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    AndyAndy Registered Users Posts: 50,016 Major grins
    edited October 28, 2005
    TristanP wrote:
    1. Does the viewfinder brightness depend solely on the max aperture of the lens?

    more so, it's the size of the viewfinder. 1.5x and 1.6x bodies have smaller viewfinders than ff cameras. some find them dimmer to work with, others don't have an issue. it's a function of your eyesight, too. the lens is wide open when you are composing, looking thru the viewfinder, it stops down at time of exposure. so yeah, an f/1.8 lens will brighter than an f/5.6 lens....
    TristanP wrote:

    2. Will using a lens designed for full frame cameras that has less brightness and corner sharpness perform "better" on the 20D/Rebel since the imaging circle is smaller?

    so yeah, a 16-35L for example will perform better in the corners/edges on a 1.6x body than on a ff body.
    Andy

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