[HUG ] Re: AW: Re: Biogons and digital backs

Hello,

Thanks for the most interesting discussions.I'm almost totally a 
lurker but since digital world is in my sphere I have some points to 
make.

The new Kodak 53.6 sensor has a resolution of 8304 pixels. This makes 
155 pixels/mm. In order to be useful for resolution ppurposes you need 
at least  2pixels/line or rather 4 to get a workable resolved line. 
This does not imply its perfectly resolved. Viewing Zeiss mtf charts 
shows that the Biogon is a marvelous lens, In fact the MTF center 
values for 40 lines/mm is about 60% - compare that to many other 
"digital" APS-C lenses. See the MTF charts from Zeiss at 
http://www.zeiss.com/C12567A8003B8B6F/EmbedTitelIntern/Biogon4.
5_38mm_CFi_104942_e/$File/Biogon4.5_38mm_CFi_104942_e.pdf  

So gentlemen draw your own conclusions how good a lens must be to beat 
the Biogon. The only drawback - which maybe modern CCDs have overcome  
- is if the angle of incidence on the sensor as you guys have noted 
makes for loss of energy on the CCD in the corners of the sensor.

Cheers,

Ronald Arvidsson


Ulrik Neupert wrote:
> Dear friends,
> I have no personal experience with digital backs. During Photokina I 
visited
> the Phase One booth to have a look at recent developments in digital 
backs.
> They now offer the P65+ back with 60,5 MP and sensor size of 53,9 x  
40,4
> mm. I expressed my happyness that now a Hasselblad SWC will still be
> superwide with this back. They told me that their sensor would not 
have a
> problem with vignetting but that the Biogon would not offer the 
resolution
> to exploit their sensor fully. If this is true or a marketing 
strategy to
> sell their claimed to be superior Phase One camera (Mamiya, i think) 
i do
> not know. But I'd welcome comments on this question.
>
> Ulrik
>
>
> 
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