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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