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Resolution of Zeiss lenses

austin

New Member
Hi Folks,

I became interested in Hasselblads through a facination with high resolution images.
Checking through my documentation, I haven't found anywhere the resolution specifications for lenses in the Zeiss range for Hassies. Is anyone aware of a listing with the resolution specified in lines resolved per mm? Alternatively if anyone can give me individual specs, I'll compile a table and share it.

Thanks in advance,
Gerard
 

qnu

Banned
MTF graphs for all Hasselblad lenses are available on both Hasselblad's and Zeiss's websites.
They're part of the lens data sheets, showing lots of other usefull info too.

These sheets are not stating resolution in "line pairs per mm", but that's because MTF says so much more.
 

jotloob

MFF-Patron
> Hi Gerard I know of 2 different ZEISS CATALOGUES just for Hasselblad lenses . They show all the info you want . ask your dealer or try in ebay. Also try the web pages of ZEISS . if the info you want is in english or not i can not tell but there you will also find detailed info and diagrams. regards jürgen
 

austin

New Member
Thanks for the pointers guys, I'll take a look, as for local dealers, really I have to go to Paris (400 km) so that will have to wait a while, I'll continue scanning the web.

QG could you possibly explain (or tell me where I'll find an explaination of) MTF? My optics training was more than 30 years ago, and it's not a term I recognise.
You seem to be on the same time zone as me, are you in Europe?
Kind regards, Gerard
 

qnu

Banned
MTF is the Modulation Transfer Function.
Simply put the ratio of edge contrasts in target and image at different frequencies and image heights.

The higher the target (line, i.e. detail) frequency, the more trouble a lens will have to produce a high-contrast (i.e. true to target) image.
Ideally (though impossibe) MTF will be 1 at all frequencies and image heights. What we're looking for is a flat MTF curve (constant with image height), as close to 1, i.e. as high as possible. And that for both low and high target frequencies.

High resolution (lp/mm) can be achieved with poor contrast (low MTF score at high frequency). The resulting image will look worse, les sharp than a lower resolution image with better contrast (higher MTF score at lower frequency). MTF shows both (contrast at a given resolution) and is a better meassure for lens performance than line pairs per mm.

Yes, i'm in Europe too. About twice as far from you as Paris.
 

austin

New Member
Thanks QG, That was very clear, and well explained! I'll keep working on this, and come back to you on it, Gerard
 
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