Archived posting to the Leica Users Group, 2010/11/07

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Subject: [Leica] 90 AA - focus shift?
From: jbcollier at shaw.ca (John Collier)
Date: Sun, 7 Nov 2010 16:24:42 -0700
References: <C49D8150-E2D0-4E99-91F7-F8707FA3E566@125px.com>
 
I can't comment on the digital/focus shift issue but my 90/2AA was tack 
sharp though out the focus range. Wide open it was slightly softer in the 
corners up close but only slightly and light years ahead of any other 80 to 
110 lens.

John

On 2010-11-07, at 1:20 PM, Tim Gray wrote:

> I've heard the 90 AA is a wonderful lens. I've also heard that it is 
> horrible below 3 m OR it loses a bit of performance in that range.  
> Probably closer to the latter, but I'd like to hear opinions on that if 
> you have any.  How good/bad is it closer in?
> 
> Which brings me to my 2nd question. I've read that the decrease in 
> performance close in on this lens is due to focus shift. True? Does that 
> mean there is a plane of bitingly sharp detail, but just not where you 
> want it to be?
Replies: Reply from hopsternew at gmail.com (Geoff Hopkinson) ([Leica] 90 AA - focus shift?)
Reply from benedenia at gmail.com (Marty Deveney) ([Leica] 90 AA - focus shift?)
 In reply to: Message from tgray at 125px.com (Tim Gray) ([Leica] 90 AA - focus shift?)