Directly-Coupled Configurations for 2" Eyepieces The ideal way to use the MPCC for visual use with 2" eyepieces is to directly couple it to the eyepiece, via the eyepiece's 2" (48mm) filter threads. This allows the MPCC to be accurately positioned, providing the optimum spacing for top performance and taking the guesswork and error out of setting a continuously variable holder. The rigid coupling also eliminates the possibility of sag or tilt from variable holders, particularly with the largest and heaviest eyepieces. This configuration also enables the MPCC to work without needing any additional back-focus. In this configuration, the eyepiece will actually come to focus about 10mm further OUT than it does without the MPCC. Since most large Dobs are limited in their back-focus, this may be the only way to achieve coma correction with some eyepieces (short of trimming truss poles..). Dob users will also appreciate the light weight of the MPCC system, which avoids the balance problems of heavier correctors. Here are examples of direct-coupling the MPCC to some popular wide field 2" eyepieces For best performance, the corrector should be positioned approximately 55mm from the rear mounting face of the MPCC housing to the eyepiece's field stop (+/- 3mm for best on-axis sharpness). In order to attach and properly locate the MPCC, only 1-3 inexpensive adapters are required. We also offer a convenient spacer set, that will give you the spacers needed to fit the majority of 2" eyepieces. Please see the Spacer Tube and Adapter section, below, for a listing of available spacers. OPTIONAL: Configurations for 1.25" Eyepieces To use the MPCC with 1.25" eyepieces, the only additional parts required are the T2-15 Reducer/Eyepiece Holder and one or two spacer rings. The result is a compact and lightweight coma-correcting assembly that slips completely within a 2" focuser. This configuration guarantees focus in all dobsonian
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