[Dennis G]

It is great to have so many replies. The GSO finder that came with rhe telescope has an eye piece lens with a diameter of 20 mm in a vertical holder 50 mm in total length, right angles from the line of sight. The cross hairs (wire) are attached to the bottom end of this tube. Using Planet Jupiter as the target and assuming you have centred the planet in your telescope using a 9mm eye piece and to the best of your ability have the planet under the cross hairs, which will only be accurate to the centre of the eye piece lens. The smallest movement of the eye off that centre line moves the planet. Set up the CCD imager and computer. Put the cross hairs over the image and see if the planet is on the computer screen. Even a disc with a 2 mm hole to line up the cross hairs and object, which reduces eye movement considerably, but still allows a huge error to occur isn’t the answer. I carelessly used the term gun sight in my submission, whereas I should have explained fully the sight I have is ex military gun not a rifle. It is used as a surveying level and has a reasonable field of vision, but the point I wish to emphasize is, regardless of eye movement the cross hairs and object remain aligned and most of all the cross hairs remain within focus with the object. I agree you get what you pay for be it a pig’s ear or such, but I had hoped ans still do, there's a knowledgeable member of IIS who has overcome this inaccuracy and is willing to pass on his knowledge.