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Thanks all. Scott am very happy with the 100ED and Astro Physics 2.7" focuser and focal reducer. I bought it second hand with an adapter for 80ED/100ED size tubes. If you remember I cut 100mm off the 100ED's tube to fit the AP 2.7" focuser before I even looked through it.
This mod has produced a 640mm F6.4 telescope which performs nearly as good as an upmarket APO. The next thing to do to it, is to get the three black lens spacers out of the light path. These spacers cause the 'shadows' in the diffraction around really bright stars (see 100% crop below).
Fifteen minute exposures were almost impossible with the original motors on the HEQ5 because of 'jumps'. The Astromeccanica motors allow me to do long exposures at any focal length as they have no backlash and track the mount very smoothly and accurately.
Bert
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