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Thanks fred
It seems strange but makes sense when you think about it. To get faint detail I expose lobnger without going too far which ends up with larger stars. To get smaller stars I expose less and miss faint detail.
There could be some serious pinching going on here soon.
I am going out to the obersvatory tonight to give the AP a work out over the weekend so I will experiment with exposure times in 6nm Ha (10 minutes plus) on somthinbg like the horsehead (not again !!!!!!!!!!!!!!!!!!!) but it seems like a good target at the moment - a little further from the moon than the Rosette plus it will frame better in the f8.
Seems strange me trying to minise exposures - I was taking 30 minutes with in camera darks with the 350D not too long ago to get faint dust under the horsehead. Time to push it bit
Thanks Fred
Mark
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