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Originally Posted by guy_mancuso
Marks working on something also, like to see that final result.
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I am indeed, it's in the queue at a local engineering company to make it.
Imagine a ring of the same diameter as the lens which carries the filter glass and screws on to the red thread with the red thread replicated at the front for mounting the hood, all sized to take account of the moving front lens element and to avoid vignetting.
It will add about 9mm to the length of the lens but allow the standard hood and lens cap to be used. One issue is that the only reason the hood/lens carrier goes tight when it is screwed on is because of the O-ring. There will not be one on the front of my new ring, so I'm using a knurled locking ring behind the hood to lock it square. The filter will be no more than 1mm in front of the front lens element at its furthest position forwards.
It will be almost impossible to develop this without some cosmetic scarring of the lens, because it is all we have to work to, so the lens is currently wrapped in a protective layer, including the front lens element, with just the front rim of the lens exposed. I expect the red anodising will take some scarriing so it may go back to Solms for re-work, they'll be wondering what I've been doing to it.