A second hand Celestron Neximage reducer lens. The optics have been checked and they are clean. This is designed to thread directly into a Celestron NexImage Solar System Imager to double the field of view.
Second hand Meade F3.3 focal reducer for SCT telescopes in good condition. The lens is spotless. No marks or flaws and perfectly clean. The lettering has started to fade away as you can see by the image, but this doesn't affect the performance
An Ascension field flattener in used but good condition. The optics are clean and it is in full working order. Comes boxed. This is designed to correct field curvature on Ascension ED Triplet refractors.