thanks Doug as this is more a Filter Wheel hardware issue, than a Software you can move this post to SBIG Filter section as a reference...
found issue with wheel alignment , issue resolved
also have removed sbig drivers and re-installed
maximdl 6.7 latest sbig driver 4.81 firmware 2.58 run as admin win 7 64 bit pro stt8300m fw8 stt filter wheel 8 filters used hi all and thanks...
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