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Old 2nd October 2020, 02:39 PM
tonyowen tonyowen is offline
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Join Date: Oct 2020
Location: Anglesey 53.3N 4.4W
Posts: 5
Default Imperial to metric enlarger lens adaptor

I have a 1 1/2" - 24tpi mounting ring for a Wray lens
I have 39mm [26tpi] standard mounting rings
[1 1/2" is 38.1mm, the root diameter of the 39mm rings is 38.02mm]

However, the outside diameter of the Wray lens' 1 1/2" thread is the same as or slightly smaller than the threaded bore of the 39mm ring.
In addition the lenght of the male and female threads is very short so the difference betwene 26 and 24tpi is of little effect.

Using masking tape I can get the Wray lens to fit into the standard 39mm ring BUT it tends to come loose. Also I cannot satisfactorily unscrew and re-screw it into the 39mm ring.

Does anyone have any suggestions for long-lasting methods of 'increasing' the 1 1/2" thread so that it can be screwed into and out of the 39mm ring many times.

The reason for asking is that I have a 50mm and 150mm lens that both have 39mm threads, but the mid-sized 108mm [4 1/4"] Wray lens has the 1 1/2" thread.

It has been suggested that SRB could make an adaptor - that do 1 1/4" to 39mm - I have yet to contact them.

regards
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