Archived posting to the Leica Users Group, 2016/09/02

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Subject: [Leica] IMG: A Morning with the Old Ross Lens
From: jhnichols at lighttube.net (Jim Nichols)
Date: Fri, 2 Sep 2016 16:18:42 -0500
References: <e70f320a-0874-14bc-de2f-d92bb45537ab@lighttube.net> <0730cda6-0ae6-5f5f-b0b5-b19dff2b101d@summaventures.com>
 
Peter, this is a commonly used statement, but is only partly correct.  
The Ross lens has an 8-inch focal length, so the magnification is that 
of a 200mm.

The crop factor for a Fuji with an APS-C sensor is 1.5.  So, the angle 
of view is that of a 300mm.

Jim Nichols
Tullahoma, TN USA

On 9/2/2016 3:25 PM, Peter Dzwig wrote:
>
> I guess this is equivalent to about a 260mm lens (8" x 25.4mm) x 1.3 crop 
> factor?
>
>
In reply to: Message from jhnichols at lighttube.net (Jim Nichols) ([Leica] IMG: A Morning with the Old Ross Lens)
Message from pdzwig at summaventures.com (Peter Dzwig) ([Leica] IMG: A Morning with the Old Ross Lens)