[glend (Glen)]

My AT 60ED finally arrived today, and here are some preliminary unboxing photos. As you can see, it is identical to the TS60, and very similiar to the WO Z61. It has a sliding dew shield and a neat single clam shell ring, which opens up to allow reversing the mounting shoe to perfect balance. I have attached a 100mm Losmandy dovetail to the mounting shoe, which accepts two standard 1/4" screws. Objective is an FPL-53 Doublet, focal length (f6) is 360mm. I bought the AT Flattener (which does not reduce, so it stays at f6). The image circle of the scope is 41mm without the Flattener, when the Flattener is used the image circle icreases to 43mm. A standard 42mm T-ring may vignette so the Flattener uses a 48mm T-Ring. The Flattener screws onto the focuser drawtube (once the EP holder is removed), and the camera end of the Flattener is 48mm of course. The optimal spacing from the shoulder of the Flattener where the 48mm T-Ring threads onto the camera is 55mm (+ - 2mm), which suits most DSLRs. In the last photo you can see the Nikon 48mm bayonet fitting attached to the Flatterner.

Hopefully I will be able to get it out for some first light images tonight. More to come.