[Leica] 180/f2.8 & Infinity focus

[rsphotoimages at comcast.net (rsphoto's email)]

Good point.

I shoot the Vario 70-180 APO.  Leica says they have a bit of 'head  
space" beyond the infinity mark to allow for temperature variations

A always set the lens at the infinity mark to insure sharp distant  
focus.

Probably the same with most better tele lenses.

Or not.

Just my experience with that particular lens.


Bob



On Apr 5, 2009, at 7:32 PM, Ken Iisaka wrote:

I don't own this lens, but does this lens per chance focus beyond
"infinity?"  A lot of long lenses allow movements beyond "infinity" to
compensate for temperature variations.

On Sun, Apr 5, 2009 at 5:12 PM, Spencer Cheng <scheng at aotera.org> wrote:

> Hi Folks,
>
> I've been trying out my father-in-law's 180/f2.8 (serial number  
> dates it to
> about 1969, converted to 3-cam by Kindermann in Toronto) with a R-8  
> I bought
> off Ted. I finally had a chance to take it out into the countryside  
> today
> and noticed that when I try to focus at infinity, the focusing  
> screen is
> still slightly blurry. I tried the same R-8 body with a 90/f2.8 and  
> infinity
> focus seems to be fine. So this would seem to suggest that the lens  
> has some
> problem.
>
> Before I send the lens to Kindermann, are there any known problems  
> with
> infinity focus with this lens?
>
> Regards,
> Spencer
>
>
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information
>
>


-- 
Ken Iisaka
first name at last name dot org or com

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