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Thanks, Raymo, Fernando and Zuts.
Yes, due to light pollution in my area any sub more than 180 seconds gets washed out and at full moon even 60 sec subs can be washed out so the L-enhance filter works great allowing 300sec or longer.
I do not have a wedge but i am considering getting one but any wedge able to cope with the weight of a 12inch LX200 and attached gear(@~40kg) usually comes at a high price even at 2nd hand prices.
For now the Meade field de-rotator was cheap 2nd hand and works very well, other more expensive field de-rotators work even better, after some research I found advice that to get the best from the Meade field de-rotator you need to sync the mount on the object to allow the field de-rotator to use the correct de-rotation values for the area of sky being tracked.
Thanks, Wayne.
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