[Leica] Digital cameras with large aperture lenses

[henningw at archiphoto.com (Henning Wulff)]

At 10:26 PM +0100 3/17/05, animal wrote:
>I asked Erwin  Puts this yesterday and he states that it,s not so 
>Acording to him F1 will still be twice as bright as 1.4 .
>He also mentioned that his credibility on digital fora is so bad 
>that he dare not post on them.
>best simon jessurun

It might be 'twice as bright' but the sensor doesn't know that, and 
won't get the benefit.

Erwin might indeed have some problems on digital fora unless he gets 
his technical stuff straight, as he seldom wins people over with his 
wit and humour on the net, although he apparently does have some in 
person. :-)

>----- Original Message ----- From: "Don Dory" <dorysrus@mindspring.com>
>To: "'Leica Users Group'" <lug@leica-users.org>
>Sent: Thursday, March 17, 2005 1:33 PM
>Subject: RE: [Leica] Digital cameras with large aperture lenses
>
>>Adam,
>>Two mutually reinforcing actions are going on to make large aperture
>>lenses vignette on digital sensors.  The first is the same as on wide
>>angle lenses; light rays from the edge of the lens are striking the CCD
>>at a relatively high angle and thus lost on the edge CCD's.  The second
>>is that a micro lens by nature focuses the light to a point, however, if
>>the light ray is striking the micro lens at a sufficient angle, the
>>focus of the micro lens is not on the underlying CCD.
>>
>>Don
>>dorysrus@mindspring.com
>>
>>-----Original Message-----
>>From: lug-bounces+dorysrus=mindspring.com@leica-users.org
>>[mailto:lug-bounces+dorysrus=mindspring.com@leica-users.org] On Behalf
>>Of Adam Bridge
>>Sent: Thursday, March 17, 2005 1:50 AM
>>To: Leica Users Group
>>Subject: Re: [Leica] Digital cameras with large aperture lenses
>>
>>I don't understand how a microlens affects the full aperture
>>performance of a lens. More light is more light isn't it? So how would
>>this work?
>>
>>Adam
>>
>>
>>On Tue, 15 Mar 2005 14:39:16 -0800, Henning Wulff
>><henningw@archiphoto.com> wrote:
>>>Regarding the recent discussion about fast lenses not having linear
>>>response re: their f/stops, and acting like slower lenses, here is a
>>>recent discussion on dpreview on the issue. Conclusions are similar
>>>to the ones voiced here.
>>>
>>>http://forums.dpreview.com/forums/read.asp?forum=1029&message=12649209
>>>
>>>--
>>>     *            Henning J. Wulff
>>>    /|\      Wulff Photography & Design
>>>   /###\   mailto:henningw@archiphoto.com
>>>   |[ ]|     http://www.archiphoto.com
>>>_______________________________________________
>>>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
>>
>>
>>_______________________________________________
>>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


-- 
    *            Henning J. Wulff
   /|\      Wulff Photography & Design
  /###\   mailto:henningw@archiphoto.com
  |[ ]|     http://www.archiphoto.com