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@GA2G
Ok. I'll have a look. 20mm lenses are normally on the expensive side, but eBay is still the best place to find these. Oh, Camera Fairs are less accessible, but the stuff there can't really be beaten for prices. Think dirt cheap.
**SLR **
RangeFinder
With a SLR, you view the image from directly above the lens. The eyepiece has a mirror and prism in front of it, which turns the image right-way up, and right-way round. A rangefinder has an opening above and to the side of the lens. So the view is NOT through the lens, but from the side. Viwing an image through a SLR camera, shows the magnification of each lens. Its easier to use for those not accustomed with different systems.