[rollei_list] Re: Zeiss Ikoflex Lens Issue
----- Original Message ----- From: "Mark Delman" <hmdelman@xxxxxxxxx> 
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Thursday, December 28, 2006 6:53 AM
Subject: [rollei_list] Zeiss Ikoflex Lens Issue



Hi folks:

I am in the process of cleaning and restoring a Zeiss
Ikoflex original model (coffee can).

I took apart the viewing lens to clean the elements
but got the placement and or direction of the elements
out of order.

Does anyone have information, a lens diagram, or
service manual which can shed light on this?

Marc James Small, can you resscue me?

Many thanks

-Mark
HMDelman@xxxxxxxxx
The lenses are simple Triplets. The end elements are strongly convex toward the outside and more weakly convex toward the stop. They are likely of different diameters with the larger being the front. The center element is harder because it is biconcave with nearly equal curvature on each side. However, the two curvatures are not the same. You may have to determine the correct direction experimentally. The difference in image quality is large and quite noticable. When facing the wrong way the image will be very blurred away from the center. Generally spacers are arranged with the sharp surface against the center lens. 

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 
---
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