[rollei_list] Re: OT / prove it !
- From: Fred Fichter <ffichter@xxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Thu, 31 Mar 2005 02:19:33 +0200
Understood. Well built, and no noise.
I've found something on the APUG website related to lens design :
bjorke
09-04-2004, 09:43 AM
I'm surprised that NO ONE answered that Leica M lenses are better than
Nikkor SLR lenses, and then said WHY. Because it's true, and here's the
"why" part:
Rangefinders don't have a reflex mirror. For a 35mm SLR, the mirror
(to show full frame) needs to be (24mm*sqrt(2))mm across, MINIMUM. So
that's 34mm of volume in which the lens elements cannot intrude or
they'll get whacked by the mirror. So the lens flange (where the lens
connects) needs to be at least that far from the film. A Rangefinder,
with no mirror, can place the flange much much closer --
back-protruding lens elements can go almost right up to the shutter
curtain (some moving lightmeters actually hit some extreme-wide
lenses!)
Okay, so how do you make lenses for a camera with (Nikon) flange
distance of 43.5 mm when the focal length may actually be less than
that? By using retrofocus designs, additonal elements, thicker glass.
The same applies to even color-correct normal lenses. The rangefinder,
meanwhile, can use simpler lens formulas, fewer elements, and thus have
higher contrast and MTFs.
When I got my Contax, I could see the difference immediately, right on
the negs, compared to my Canon SLR. The RF negs are just plain
snappier.
Leica SLR lenses have the same limitations as Nikon or Canon. But RF
optics like those from Leica and Zeiss are indeed superior in the
middle and short lengths. For long lenses, you should go SLR anyway.
And flange issues disappear.
On Mar 31, 2005, at 1:48 AM, Allen Zak wrote:
> Much of the fuss over Leicas is:
>
> 1. Often it is easier to make certain kinds of photographs with it
> than with SLRs. Rangefinder focusing is much more precise than TLR,
> especially important with wide angle lenses, wide apertures and under
> low light conditions. Where discretion is necessary, a Leica shutter
> sound is quiet, enough to be the courtroom standard in venues where
> photography is permitted. It is the best made of current RF cameras
> and its lenses are first rate. It's good equipment for photographers
> who like to work "life as she is lived."
>
> 2. Some photographers prefer direct framing through a viewfinder to
> composing on a screen image. This is something that matters to those
> to whom it matters.
>
> 3. Mechanically, they are sweet and exist in sufficient variations
> plus accessories to attract connoisseurs and collectors.
>
> Good photographs can be made with many different types of cameras, but
> for applications some are better than others.
>
> Allen Zak
>
>
>
> On Mar 30, 2005, at 5:51 PM, Fred Fichter wrote:
>
>> Hi there,
>>
>> I know this is a Rollei list, but people here seems to own quite a lot
>> of gear...
>>
>> Here is my question : why all this fuss regarding leicas ? Because it
>> produces better pictures ? Then please, show me examples of pictures
>> that one cannot make with any SLR and a good fast lens...
>>
>> Cheers,
>>
>> Fred
>>
>> http://homepage.mac.com/ffichter
>>
>>
>
>
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