Archived posting to the Leica Users Group, 2010/08/22

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Subject: [Leica] new 75mm M lens
From: benedenia at gmail.com (Marty Deveney)
Date: Mon, 23 Aug 2010 13:22:09 +0930
References: <AANLkTi=5M=3wF=wsPUgqcAmeOVZ7UxbZFZHJH3SsRRVj@mail.gmail.com> <p06230916c894882fa2a0@192.168.1.22> <AANLkTi=r4kFQ1H1Ysi+4h89Deps4ZXxfO=hFF1M9zBGT@mail.gmail.com> <p0623091cc8949fa52242@192.168.1.22>

And the main engineering solution to the near-far correction problem
is a floating element, which Cosina is not set up to manufacture.  I'd
have preferred a design like the 35/1.2 with little focus shift but
lower overall contrast.  But I already have a 75 Summilux.

Marty

On Sat, Aug 21, 2010 at 6:47 AM, Henning Wulff <henningw at archiphoto.com> 
wrote:
> It takes a rather large amount of effort and expense to get rid of 
> spherical
> aberration, which is the main cause of focus shift. The problem is that if
> you just try to use aspherics to get rid of spherical aberration at long
> distances you are likely to get overcompensated spherical aberration at 
> some
> distance and apertures, and that is one of the main causes for nasty bokeh.
>
> This lens is supposedly based on the old Heliar design from Voigtl?nder of
> old; mainly the large format lens designs that were the classic portrait
> lenses of their time. These had a 'glow' which was very appealing, and the
> focus shift could be dealt with by re-checking the focus after stopping
> down. It was never that serious, and since pixel peeping had not yet been
> invented, often went unnoticed.
>
>
> At 1:30 PM -0700 8/20/10, mehrdad wrote:
>>
>> tom a mentions about a glow wide open , which i translate to focus shift.
>> all the latest cosina lenses have focus shift syndrome, i wonder why! and
>> leica is getting away from it as fast as they can.
>> On Fri, Aug 20, 2010 at 12:37 PM, Henning Wulff
>> <henningw at archiphoto.com>wrote:
>>
>>> ?I had a chance to play a bit with Tom Abrahamsson's copy of the lens. It
>>> ?looks very nice, and seems a bargain at the likely price of $7-800US.
>>> It's
>>> ?about halfway in size and weight between the 75/2 and 75/1.4 of Leica's.
>>> The
>>> ?hood is not built in, but can be reversed with a unique screw in/clamp
>>> on
>>> ?two part design that seems a bit fiddly.
>>>
>>> ?I didn't do any rigorous testing, but it seems more like the Summilux in
>>> ?character and would make an excellent portrait lens, hence 'Heliar
>>> Classic'.
>>> ?It seems very sharp though at f/1.8 with very pleasing bokeh. It seems
>>> to
>>> ?have some focus shift, just like the Summilux, but it's very little.
>>> ?Unfortunately, like the 75/2.5, it only focusses to .9m.
>>>
>>>
>>>
>>>
>>> ?At 5:17 PM +1000 8/20/10, Geoff Hopkinson wrote:
>>>
>>>> ?For anyone interested a friend of mine is the local distributor for
>>>> ?Voigtlander products and he has just released details of a new 75mm M
>>>> ?mount
>>>> ?lens in their range. You can read the detail on his blog here.
>>>>
>>>> ?http://mainlinephoto.wordpress.com/
>>>>
>>>> ?Cheers
>>>> ?Geoff
>>>>
>>>
> --
>
> ? * ? ? ? ? ? ?Henning J. Wulff
> ?/|\ ? ? ?Wulff Photography & Design
> ?/###\ ? mailto:henningw at archiphoto.com
> ?|[ ]| ? ? http://www.archiphoto.com
>
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>


Replies: Reply from mark at rabinergroup.com (Mark Rabiner) ([Leica] new 75mm M lens)
Reply from mark at rabinergroup.com (Mark Rabiner) ([Leica] new 75mm M lens)
In reply to: Message from hopsternew at gmail.com (Geoff Hopkinson) ([Leica] new 75mm M lens)
Message from msadat at gmail.com (mehrdad) ([Leica] new 75mm M lens)