Archived posting to the Leica Users Group, 2007/03/19

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]

Subject: [Leica] IMG: Focus, Noctilux, M8, C Mode & Scotch
From: jhnichols at bellsouth.net (Jim Nichols)
Date: Mon Mar 19 18:41:01 2007
References: <C2246B8C.FC46%robert.rose@mac.com> <C67B858D-4630-4C79-A633-92A9B201289D@shaw.ca>

John,

I agree that the lens performance at infinity is not changed by the 
adjustment.  However, it is possible that the rangefinder's coincident image 
may not agree absolutely with the lens distance scale at infinity. Is this 
not correct?

Jim Nichols
Tullahoma, TN USA
----- Original Message ----- 
From: "John Collier" <jbcollier@shaw.ca>
To: "Leica Users Group" <lug@leica-users.org>
Sent: Monday, March 19, 2007 9:22 PM
Subject: Re: [Leica] IMG: Focus, Noctilux, M8, C Mode & Scotch


> Adjusting the rangefinder does not change the lens's performance at 
> infinity the slightest smidgeon. The rangefinder's superimposed image  may 
> not line up but that won't show in the photos.
>
> John Collier
>
> On 19-Mar-07, at 5:32 PM, Robert Rose wrote:
>
>> Can't be sure yet that other lenses are unaffected.  I added two  near 
>> focus
>> images to the gallery to show that the Noctilux is in tip top shape  now:
>>
>> http://gallery.leica-users.org/v/rjrose/focus/
>>
>> I will add an infinity photo when the haze clears and I can see some
>> mountains!
>>
>> Here is why I am not sure about the other lenses yet.  I think that  near
>> focus issues are attenuated due to focal length or aperture on my  TE 
>> (f/4),
>> 90 Elmarit (f/2.8), 135 Apo-Telyt (F/3.4), 28 Summicron-M (f/2 but  wide
>> angle).  They all seem okay at both near and infinity.
>>
>> I am suspicious about the 50 Summicron at near focus, but I need to  do 
>> some
>> checking on that lens, and I ran out of time.  Sorry.
>>
>>
>> From: Jim Nichols
>>
>> Do I understand correctly that the very small cam adjustment that  you 
>> made
>> corrected the Noctilux problems without spoiling the adjustment for 
>> other
>> lenses?
>
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information
> 



Replies: Reply from jbcollier at shaw.ca (John Collier) ([Leica] IMG: Focus, Noctilux, M8, C Mode & Scotch)
In reply to: Message from robert.rose at mac.com (Robert Rose) ([Leica] IMG: Focus, Noctilux, M8, C Mode & Scotch)
Message from jbcollier at shaw.ca (John Collier) ([Leica] IMG: Focus, Noctilux, M8, C Mode & Scotch)