[Leica] 24x36mm sensor for the RFDM

[Frank.Dernie at btinternet.com (Frank Dernie)]

Hi Frank,
there has been a huge amount of discussion on the web about this over  
the last 6 years or so. The technical argument in favour of  
telecentric lenses for digital sensors is compelling. This leads to  
large lenses. There is certainly something on the Olympus site to get  
started with. It is not difficult to understand.
Frank

On 16 Jun, 2006, at 00:02, Frank Filippone wrote:

> Maybe I missed something, but I have not read an argument as to the  
> need to make digital lenses bigger for the smaller sensor than
> 24x36 film.  There may be an issue that I am not aware of, but  
> marketing issues must be put aside to make sense technically.  The
> availability of some Olympus lens of size X is a marketing issue.   
> Technical details would be helpful.
>
> Comparing the size of true WA to Retrofocus designs is apples to  
> oranges.  But if this is the comparison issue, then yes, the
> retrofocus design will be bigger and yes it will have higher angle  
> ( less oblique) of attack to the sensor, and therefore "better"
> for digital sensors.  But I already stated this point.  My comment  
> about using R lens designs on a M mount lens.  Makes sense to me.
>
> What I said is that for a smaller target sensor ( digital or film)  
> the lens can be designed smaller because the image circle is
> smaller. This is of course for the same F stop and Fl lens.  It is  
> the same argument for Retrofocus lenses as it is for true WA
> lenses.  Smaller target = smaller optics. Always true given the  
> same lens design.
>
> Why is the Olympus lens larger?  Beats me.  I have no idea why the  
> designers made it that way.  Is there a way we can ask them?
>
> I am open to continued discussion on this subject.
>
> Frank Filippone
> red735i@earthlink.net
>
>
>
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