Update: No!<br />Even if no astronomer other than brother Jules.Verne below answered this question 7 years later.<br />what you see above is a perfectly colimated telescope.<br />(thx Jules)<br />If the inner circle and the outer through your setup does not look like the video above but is slightly or heavily off center, your telescope needs to be colimated (it's not as hard as it seems) so you can achieve the above effect when the inner lenses are perfectly aligned!<br />all in one breath! :-)<br /><br />Old description here <br />=====================<br />do you guys think i should colimate? <br />this is the telescope that takes shots of C/2010 x1 on this channel. <br />i focus in-out manually, hence the movement, <br />Arcturus in view<br />Intrafocal to Extrafocal in long (for a star) exposures<br />Please comment on colimation need<br />scope on Alt/Az tripod hence the extra movement<br />...<br /><a href="https://www.youtube.com/watch?v=Ebvs1bnroqs" target="_blank" rel="nofollow">https://www.youtube.com/watch?v=Ebvs1bnroqs</a>