Starquake, Hi, The huge refractors of that time had enormous F: numbers and the CA was adequately reduced enough to see Saturns rings, however if you lived long enough to find such an object with a scope that size, I feel that you would be grateful to get any image at all!I worked out some time ago from the data on these long focus scopes that the magnification was around X400 An interesting point, the OG, only had an apeture of three inches or so,it looks as if scope was in fact nothing more that a glorified pinhole scope, as the depth of focus is collossal!, what if the lens is omitted, would you still get an image?? also you would still get an image using an eyepiece, you can prove that for your self by placing an eyepiece about 100mm from a pinhole and pointing at an object, the image is fuzzy and dim, but it proves the point.