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Hi Chris and Richard
I only have 3 orthoscopics, they are UO HD 12, 9 and 7mm. They are really great eyepieces and I recommend them for all types of observing. They are sharp and good value. They are light weight and compact which are virtues in my opinion.
I use the 12mm and 9 mm the most in my 90/1500 refractor. The 7mm gets occasional use in the 102/816 refractor. The 12mm is one of my favorite eyepieces for my 152/2330 refractor. That is about 186x and I rarely use more magnification than that as the conditions are not good enough.
With your 1200mm focal length I would suggest trying the 9 and 7mm orthos. The 6mm would most likely only get used on nights of exceptional seeing or when trying to split difficult double stars.
Regards
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