|
Ian,
200 metres from a beach isn't likely to be much good for observing - I've tried when my mum had a house right behind Avalon beach, and the seeing was consistently awful. If there's a sea breeze you've got cool saturated air coming in from the water mixing with warmer dry air over the land and the turbulence - and effect on seeing - is pretty bad. Your 6" scope is big enough to show this.
You really do need to get away from the coast, and away from major sources of heat particularly buildings where hot western walls and roof will release heat for hours, creating thermals and turbulence.
There is another issue too. Salty humid air is bad for scopes, particularly the mirror coatings, and it will leave a sticky film on your optics - corrector, eyepieces etc that has to be wiped off.
|