[Leica] lens prices..... 35 lux- tri elmar

[bernardofeio at yahoo.com.br (bernardo feio)]

Thanks to all
   
  Just one other question
   
  I notice in the price list that there are 3 versions of the trielmar 
28-35-50
   
  What changed from the 1st to the second?


Frank Dernie <Frank.Dernie@btinternet.com> escreveu:  The "aspherical" was 
made in small numbers. It has 2 aspherical 
elements which had to be ground by hand to a profile which deviated 
from spherical by a tiny amount. The scrap rate of these hand made 
elements was reported to be high and far fewer are thought to be made 
than the 2000 which had been planned.
The "ashp" was a new design using one aspherical element manufactured 
by a hot pressing process where a super accurate aspherically 
surfaced die is pressed against the heated glass imprinting the 
aspherical profile onto it. This is a MUCH less expensive process and 
allowed the lens to go into normal production.
Several other lenses were subsequently updated to include hot pressed 
aspherical elements. The size of the elements which can be produced 
by this process is limited, I don't know whether by stress or load 
levels or accuracy. This limits its use mainly to the smaller 
diameter elements in wide angle and zoom lenses. Nowadays grinding 
aspherical elements using CNC machines is feasible so it is not such 
an expensive process any more. AFAIK the only current Leica lens 
using a ground aspherical element is the 90mm f2 - someone will 
surely correct me if I am mistaken.
The original Noctilux, an f1.2 design, also used 2 hand ground 
aspherical elements and was made in tiny quantities also.
I own a 35mm aspherical and it is the finest lens I have ever used. 
It was the main reason I bought an Epson RD1 and then a M8!
Frank

On 20 Aug, 2007, at 11:43, bernardo feio wrote:

> Hello
>
> I will bookmark the link this time! :-)
>
> Thanks
>
> Any optical difference between the 35mm Summilux "Aspherical" and 
> the ASPH?
>
>
> Didier Ludwig escreveu: opps sorry have 
> mixed up summicrons and summilux. Colucci indicates the value for a 
> asph lux 35 with $2.2k which is realistic.
>
>
>> The prices for used 35 asph Summilux have increased compared to 
>> Colucci's list, since the introduction of the Epson R-D1 and the 
>> M8. Uncoded samples sell for $1600-2000, coded for more.
>> D.
>>
>>
>>
>>> Summilux 35mm (ASPH and before)
>
>
>
>
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