S&T Test Report accessory. Meade does not offer one, so buyers will have to search for one from another source. For all my testing I used one I had on hand. Alternatively, you can use the supplied M48-to-M42 step-down ring to attach the more standard 42-mm T-ring (such as from Meade) for DSLRs, or for attaching other types of CCD cameras fitted with standard M42 threads. The distance from the back surface A single 5-minute exposure with a modified Canon 5D MkII DSLR at ISO 1600 shows stars as pinpoints to the very corners of the full-frame sensor (insets). Focus was uniform across the field. The slight asymmetric purple halo around Deneb is an artifact from the camera's internal IR filter and is seen in images taken with all telescopes. 68 OCTOBE R 2 018 * SK Y & TELESCOPE of the focuser to the focal plane is 66 mm, and the focuser has 32 mm of travel. When using a DSLR with conventional 55-mm back focus, the focuser is racked out 11 mm, leaving just 22 mm of further outward travel to accommodate the shallower back-focus requirements of many dedicated CCD cameras. CCD cameras with sensors close to the front will require a short M42 extension tube to reach focus. As good as the focuser is, its primary drawback is that it provides no accommodation for dropping in a filter between the telescope and camera. DSLR owners wanting to shoot filtered images (particularly with modified cameras) would need to use clip-in filters inserted into the camera's mirror box. These require the mirror to be locked up, preventing any use of the optical viewfinder to find or frame objects.