The Olympus LM-SP stage plate is made of plexiglass, it should very simple to
duplicate it using a forstner bit to create the step. The interruptors are
made of metal and seem to be painted black and white.
-mark
> On 18-Mar-18, at 9:33 PM, JOHN DUGGAN via olympus <olympus@xxxxxxxxxxxxxxxxx>
> wrote:
>
> Mark, Thank s very much for those illustrations. At least I now have an idea
> of what I am trying to construct. As there is no possibility of me cutting a
> 25mm stepped hole in a clear glass plate I will run with my idea if a thin
> alloy disc placed on top of a clear plate.When time permits I will try my
> hand at machining a disc for the LM-20. Annoyingly MANY years ago I saw one
> for sale at not much more than a roll of film BUT had no use for it!!!!
> Regards John Duggan, Wales, UK
>
> From: Mark Dapoz <md@xxxxxxxx>
> To: Olympus Camera Discussion <olympus@xxxxxxxxxxxxxxxxx>
> Sent: Saturday, 17 March 2018, 21:53
> Subject: Re: [OM] 20mm f2 and Lieberkuhn Lighting
>
>
>
>> On 18-Mar-16, at 10:17 AM, JOHN DUGGAN via olympus
>> <olympus@xxxxxxxxxxxxxxxxx> wrote:
>>
>> Mark, that would be very kind. Diameter of units, and depth measured using a
>> straight edge across and measuring depth at right angle to straight edge
>> would be ideal. I assume there is very little curvature involved.
>
> The LM-38 has a very shallow curvature but the LM-20 is quite deep. The
> thickness of the reflector also changes from about 2mm at the edge to under
> .5mm at the centre. Rather than list all the measurements and try and
> explain what they are, see the following Google folder for a series of photos
> of the measurements for the LM-20, LM-38 and LM-SP:
> https://drive.google.com/open?id=1V7Hc43Ld3H3ZXezag6CcPOJJyrhYSyWb
> <https://drive.google.com/open?id=1V7Hc43Ld3H3ZXezag6CcPOJJyrhYSyWb>
>
> -mark
> --
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>
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