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Thanks Laurie & Pat , i tried longer lights but with my alt/az setup and no guiding the field rotation gives very blobby stars and a loss of detail in the image so keeping exposures short minimises this effect. I have now managed to get field de-rotator very cheap and now just need some adapters for it to fit my setup, so next to get is an OAG setup and long exposures should work well. Hopefully soon i will get this setup but for now i am just using alt/az tracking with no guiding and shorter subs.
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