Re: Lubitel and zone plate

Thanks Guillermo, for a very full answer.

I will mount it at the front of the lens and see how it goes.

Incidentally the lens assembly in the 166B is held in place by four
screws rather than a retaining ring.

Paul Lowing

>- ----- Original Message -----
>From: "Paul Lowing" <plowing@blueyonder.co.uk>
>
>
>>I am planning to mount a 75mm zone plate in a Lubitel 166B.
>>I wish to mount it where the front lens element is currently mounted as
>>apparently there is some requirement to focus a zone plate.
>>
>>
>
>Altho ZP could be focused, most of us just mount it at the focal length they
>were made for and leave them at that fixed distance.
>
>
>
>>I have removed the rear two lenses held in place by circlips but am a
>>bit stuck with the front lens and am unwilling to use brute force and
>>ignorance in case I cause some damage.
>>
>>The lens seems to be held in place with an insert from the rear which is
>>probably either threaded or a tight push fit.
>>
>>Has anyone removed this lens and could advise me on how to get the
>>offending piece of glass out of the way?
>>
>>
>
>You need to remove the whole lens assembly out of the camera's body. To do
>so, unscrew the retaining ring at rear of the lens assembly inside the
>camera. I used a screw driver to rotate the retaining ring counter
>clockwise. If it is too tight, you may want to use a pair of long nose
>pliers, like these ones:
>http://www.leevalley.com/images/item/woodworking/assorted/25k6501s1d.jpg
>alternatively, you could take a flat piece of metal and file or cut one of
>its ends so it looks like this:
>http://ca.geocities.com/penate@rogers.com/wrench.gif
>that would work as a wrench you can turn with pliers.
>
>Here is an image of one of my lubitels, I mount the ZP or Sieve instead of
>the rear element (also held in place by a C-clip), this way the focal length
>is in the order of 67mm:
>http://ca.geocities.com/penate@rogers.com/pinhole/lubi.jpg
>Here is the lens assembly when removed from the camera, its retaining ring
>beside of it:
>http://ca.geocities.com/penate@rogers.com/pinhole/lubitel5.jpg
>
>Guillermo
>
>------------------------------
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Received on Wed Apr 6 02:59:13 2005