Is ZF 25mm really 25mm?
/forum/topic/646302/0

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marcwilson
Registered: Mar 21, 2006
Total Posts: 1579
Country: United Kingdom

The older contax zeiss 25/2.8 lens was found to be closer to a 26mm lens?
Is the same true of the newer zeiss zf or is it a true 25mm lens...and therefore closer to the normal 24mm focal length.

Cheers.

Lotusm50
Registered: Sep 26, 2005
Total Posts: 5902
Country: United States

The ZF 25mm f2.8 lens is, in fact, 25.7mm ...

... and the ZF 28mm f2.0 lens is actually 28.5mm.

Most lenses aren't exactly the focal length they claim.

StevenPA
Registered: Jan 05, 2004
Total Posts: 2803
Country: Korea, South

Marc,

The data sheets (MTF) give info about the exact focal length.

marcwilson
Registered: Mar 21, 2006
Total Posts: 1579
Country: United Kingdom

Thanks guys.
Marc

deshojo
Registered: Dec 02, 2005
Total Posts: 267
Country: United Kingdom

The link to those Zeiss data sheets for those who don't have it.

marcwilson
Registered: Mar 21, 2006
Total Posts: 1579
Country: United Kingdom

out of interest it would be great to see the real world field of views of the difference between the 25 and 28mm lenses...anyone have some interior shots taken from the same place with these two lenses? ( I cant find data for the cy lenses but assume the cy and zf are the same in term of focal length)

(I know I could do a comparison myself between my c/y 28mm and 25 on a zoom but it would be good to see correct comparisons.

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