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Help required collimating my Tasco 16T

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Hi all I really need your help to collimate my Tasco 16T,it's of the "bird jones" design Ithought I had acheived collimation last night but when I star tested it the stars had tails!

Can anyone please describe in detail what I should do and what it should look like in the eyepiece etc I've got a collimation cap and a cheshire tool with an adapter so I can use it on this scope.

I have read that it's required to take out the corrector that's infront of the flat is this correct.

I've looked online for help but I'm confused as to what I'm looking at etc plus the flat to my mind cannot be adjusted for tilt as it only has a single screw in the middle of the flat holder and a tiny grub screw above it.

I know that the 3 screws on the mirror cell are to adjust the postion with the longer screws are for locking down the adjustment screws.

Can anyone describe in detailed steps as to what I should do.


Many thanks Ash.

flat holder.jpg

mirror cell.jpg

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Also found this. Have a look at the drawing in one of the included pics. In some ways this is similar to the Tasso Starguide 114 which I collimated a week or two back.  But with that there’s a central locking screw and three adjusting screws. Also there’s a correcting lens in the eyepiece tube. 



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I think it is likely that the secondary/corrector assembly is preset at the factory and no user adjustment is provided. We have a donated Bresser version and this has the conventional Newtonian type secondary adjusting screws. Because of the design, you can't really use the usual collimating aids, I've found the best option is to use an artificial star and adjust the primary mirror cell screws until the defocused "star" image is both round and evenly illuminated at the periphery. I wouldn't recommend removing the corrector lens, replacing it accurately is likely to be a lottery.   ?

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