The X1 has an adaptor mounting concealed under a knurled ring around the lens assembly.
So far Leica have not issued anything that fits it. For KAP, unless I am forced to fly in poor light, I always use a polarising filter to reduce the all too common glare from ground object reflectance. Glare ( sometimes called flare) from all manner of things is a common problem for an airborne camera, particularly as I rely on auto exposure control. Adjusting the EV value (between -2/3rds and -1 has been recommended) to ‘cool’ the whites helps a bit but I have found the half and half exposures of land and sky problematic. A PL filter really seems to help as it darkens the sky without under-exposing the ground in most cases. Although it tends to slow shutter speeds down, results show it’s worth a few lost exposures. With the right fitting it should be possible to fit a polarising filter or even a wide-angle adaptor whilst the tube itself can function as a lens hood too. The Nikon UR E8 Lens adaptor for the Coolpix 5700 and 8700 has been found to fit.
I found and ordered a UR-E8 for £1.50 from ScopesnSkies excellent ‘Astroboot’ shipped by Royal Mail in its own sweet time from just down the road in Ely.
When fitted the URE8 ‘front’ thread looks like a 52mm male but isn’t; it’s something weird like 53.5mm! There is nothing that fits it so with help from Campkins Cameras a 49mm filter was found to be a near ‘interferrence’ fit to the insde of the tube and a glassless filter was glued into the tube end. Now I have a 49mm thread on the inside of the tube which accepts a 49mm CPL filter at last!
..and the filter works a treat
So thanks to Martin Mann for the steer and thanks to all at Campkins Camera Centre I can look forward to getting more polarised shots!