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Thanks again for the replies, Yes looks like i missed quiet a few steps overall.
Been very cloudy and overcast here for the past few days, but interested to give the image version a try, never heard of those ones before.
All very new to me in working this out, simple as it seams.
I am sure the spec are true and correct from Skywatcher, just thought out of interested i would measure them up.
Going from the reply from Matt :
When measuring the focal length you need to measure from the primary mirror to the centre of the secondary mirror and then add half the diameter of the upper assembly and the height of the focuser when the focuser is wound out about 3cm.....
Primary mirror to centre of secondary mirror = 1400mm
Half the diameter of the upper assembly 450/2=225mm
Height of the focuser when the focuser is wound out 5mm
Total comes to 1630mm
Getting there, but obviously missing something.
Can't seam to pin point where i am going wrong.
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