Sassan,
I agree on the optics front and would only go with an ED lens. I need to learn how to process properly before going in that direction
. Not one for buying sight unseen, so I am not an e-bay lens buyer, but thanks for your offer. Come the time I guess a trip to the BIG CITY ( London ) will be on the cards.
Currently suffering the new toys syndrome.
CLOUDY NIGHTS 
. I did manage a few last night that I will try some sort of image merge on, to see if I get any improvement in IQ. RegiStax is not happy with my image size and 70mb Tiffs. I guess this program is more suited to webcams. Works OK with D100 Tiffs but then I got the X for its resolution.
Don