Hello Malcolm and Thanks for your reply.
Yes the Dob has the clear advantage with the extra 5" of apature and the the abillity to star hop manually rather than automated slew if I wanted to.
The lack in information I found in the SCT abillity for dso just made me wonder if the 2 are even comparable for DSO work.
Your comment on the SCT's abillity to enlarge Planetary Nebula was interesting.
Considering the extra apature for price range, the size and bulky-ness of the Dob not being an issue and my driving NEED to want to see deeper into the void makes the 16" a better choice.
You also mention an interesting aspect which I never considered and thats the SCT"s reliance on electronics and power (time limit of opperation out in the field) and malfunctioning parts.
I've in the meantime (while making my choice) ordered a few accessories :
1. OIII and LP Filters
2. 5mm and 24 mm Orion Stratus eyepieses
3. orion lazer mate
4. Telrad
5. and MORE books on DSOs and catalogues
