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Jeremy. To date I have had a 130mm newt, 8" dob, 12" dob and now 20" dob so I am reasonavly able to give some ideas on what you may see.
Colours in DSOs are almost impossible with the exception of some planetary nebulae and maybe M42. I have seen hints of colour in M42 with the 12" once on an exceptional night. This Friday just past with the 20" it was clearly coloured, but they are very pale colours. PNs will show colours even in an 8", but not all of them. The Blue Planetary (NGC3918) in Centaurus is an obvious example that is accessible now.
In regard to planets, a 10" will reveal nice surface detail on Jupiter. On good nights you will be able to make out several bands and some mottling. On Saturn the Cassini Division is easily seen. A good target would be Enceladus which is an ice moon of Saturn that is only 500kms wide. I nabbed it a few times in my 12" so should be OK on good nights with a 10".
The good new is that with a 10" there are lots of DSO's available. I did about 80 odd Messiers and lots of NGCs with the 8" over a 6 month period so just get out there and use it.
With your eyepieces, the 6mm Delos will probably only be useful on really still nights with great seeing.The other 2 will be OK, you will probably find the 20mm is your most used EP. If thinking about an upgarde I can recommend a 24mm Panoptic as the best value premium EP I have used.
Congrats on the scope BTW!!!
Malcolm
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