[Leica] LEICA could be clever

[driggett at mac.com (Christopher Driggett)]

Frank,
        Thanks.  Now since thin flexible lcd panels are in the works then 
all 
some one has to do is create a ccd film strip that can be loaded in the 
traditional; camera with the electronics and battery in the film 
cassette. Anyone remember the virtual product company called silicon 
film?

Frankly I am waiting for the Borg eye camera which I believe will come 
in not to distant future.
Cheers,
Chris


On Feb 26, 2005, at 7:20 AM, Frank Dernie wrote:

> Film is flat and equally sensitive to light regardless of the angle of 
> incidence of the light impinging upon it. Digital sensors have light 
> sensitive wells, anti-aliasing and colour filters over them, meaning 
> that light hitting them at an angle is potentially reduced in strength 
> at the peripheral photosites.
> Reflex lenses have had to have their exit pupils moved away from the 
> film as part of the necessity to clear the reflex mirror. Lenses for 
> viewfinder cameras, including rangefinders, do not have this 
> constraint and so often have exit pupils much closer to the focal 
> plane than lenses designed for film. This is one of the reasons why 
> wide angles for rangefinders are usually superior to reflex 
> equivalents on film - less compromise.
> The problem is that these WA lenses give very strong vignetting on the 
> Epson, and, I presume, any digital sensor. Goodness knows how 
> unsuitable a 36x24mm size sensor would be with lenses designed for 
> rangefinders, The Epson is restricted enough, but the effect can be 
> corrected in software within dynamic range constraints.
> Obviously therefore the effect is dependant on the design of the 
> actual lens in question, not just focal length. The Voigtlander 12mm 
> vignettes much less than the 15mm for example, and the 21mm Leica much 
> less than the 21mm Voigtlander. The Epson is supplied with correction 
> software for the Voigtlander lenses pre set, and a slider to correct 
> others by eye.
> Hope this helps,
> Frank
>
> On 26 Feb, 2005, at 14:51, Christopher Driggett wrote:
>
>> Would some explain this vignetting problem or point me to a link?  
>> Why does film not have this which is full frame and a digital sensor 
>> which is roughly the 2/3 the size in the middle do? Why do I not have 
>> this on my D2h and do on my Epson?
>> Thanks,
>> Chris
>>
>> On Feb 26, 2005, at 1:36 AM, Steve Unsworth wrote:
>>
>>> Nathan, I could be wrong, but I wonder if Leica were fixated on the 
>>> idea
>>> of a full frame sensor for the digital M when they kept saying that 
>>> it
>>> wasn't possible? From what I've seen of the vignetting in some of the
>>> shots from the RD1 they cold still be right. The decision to go for a
>>> 1.3 chip has probably made the engineer's lives much easier :-)
>>>
>>> Does anyone think that the non-professional SLR market will 
>>> eventually
>>> stabilise at 10 mega pixels? If manufacturers continue to up the 
>>> pixel
>>> count on the 1.6 crop SLRs won't we begin to see the same kind of 
>>> noise
>>> that plagues the P&S market?
>>>
>>> Steve
>>>
>>>
>>> -----Original Message-----
>>> From: lug-bounces+mail=steveunsworth.co.uk@leica-users.org
>>> [mailto:lug-bounces+mail=steveunsworth.co.uk@leica-users.org] On 
>>> Behalf
>>> Of Nathan Wajsman
>>> Sent: 26 February 2005 06:59
>>> To: Leica Users Group
>>> Subject: Re: [Leica] LEICA could be clever
>>>
>>> I fully agree with you that the lenses you mention are fantastic, 
>>> and I
>>> have bought several of them as well (although I have since sold 
>>> some).
>>> However, most of these lenses were introduced in the 1990s. In the 
>>> past
>>> few years, aside from the M7, Leica has introduced very few really 
>>> new
>>> products. OK, there is the rebadged Panasonic, but otherwise we are
>>> talking mostly about new coverings of existing models, a retro MP and
>>> not much else. The DMR is a good idea but it is at least a year too
>>> late. And worst of all is the company's longtime insistence that a
>>> digital M was impossible for all kinds of technical reasons followed 
>>> by
>>> the sudden reversal of that opinion after Epson/Cosina introduced the
>>> RD1.
>>>
>>>
>>> _______________________________________________
>>> Leica Users Group.
>>> See http://leica-users.org/mailman/listinfo/lug for more information
>>
>> _______________________________________________
>> Leica Users Group.
>> See http://leica-users.org/mailman/listinfo/lug for more information
>>
>
> _______________________________________________
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