[HUG ] Re: AW: Re: Biogons and digital backs
- From: "ronald.arvidsson@xxxxxxxxxxxxxxxx" <ronald.arvidsson@xxxxxxxxxxxxxxxx>
- To: hasselblad@xxxxxxxxxxxxx
- Date: Tue, 30 Sep 2008 09:09:34 +0200 (CEST)
Sorry meant 8304 points in the horizontal direction
Cheers,
Ronald
ronald.arvidsson@xxxxxxxxxxxxxxxx wrote:
> 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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