Is MTF chart reliable ?


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yyD70S

Senior Member
Dec 25, 2005
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#3
Default MTF charts are always taken at the max aperture.
 

zcf

Senior Member
Apr 10, 2005
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#4
usually 3rd party mtf review (magazine etc) are more trustable than the own maker one.

but lens also have some variation, who knows whether the one been reviewed is a sharp copy or lemon :sweat:.

Itdoes give you more idea on the sharpness of lens. But mtf chart don't give much info on contrast, colour, flare resistence of the lens.

I thought most mtf chart are taken at wide open and f/8?
 

billpepsi

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Jan 2, 2005
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The 3rd Rock
#5
chunkeat said:
Eg:

Sigma 24-70mm f3.5-5.6
http://www.sigmaphoto.com/lenses/lenses_all_details.asp?id=3262&navigator=2

Nikon 24mm f2.8D
http://nikonimaging.com/global/products/lens/af/wideangle/af_24mmf_28d/index.htm

The Sigma (much cheaper) is a zoom lens, the Nikon is prime. How come Sigma quality apparently better ? Thanks.

Default they are tested at max f/stop. For apple to apple comparison, both lenses should be tested at the same f/stop.
 

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