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OAG on a SCT

Started by Simon E, Oct 16, 2009, 16:02:35

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Simon E

Oct 16, 2009, 16:02:35
Anyone using one, are they good.

simon
SW 130DPS reflector main imaging scope, SWST80 refractor Guide scope, HEQ5 Mount with syncscan
ZWO ASI 120MC 1/3" colour camera Guide camera, Nikon D5100 + D3100 Imaging cameras

Mac

#1
Oct 16, 2009, 17:16:22
all my guiding is via piggy back,
so i cant really help with off axis guiding.

Mac.

RobertM

#2
Oct 16, 2009, 19:11:17
Si, off axis is good but you may well have difficulty finding a bright enough guide star especially with a small chipped guide camera.  That is the main reason most use a piggy backed guide arrangement.  Also a good off axis guider could cost you more.

Robert

MarkS

#3
Oct 18, 2009, 17:34:35

OAG also affects your image composition - it becomes necessary to adjust your view to ensure a bright enough star falls on the guider.

In theory, for SCTs, an advantage that OAG has over piggy backing is that it will also correct for slight shifts in the primary mirror as the scope changes position during tracking.

Mark
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