Maybe silly question

[captaincaveman]

Maybe this is a silly question, or ive overlooked something obvious but why havent manufacturers produced high quality draw tube mounted scopes?

Surely it would get round the storage issue of a 1000mm focal length refractor?

Jay

[Merlin66]

You mean like the ol' Captain's three pull telescopes??

Good question!

The Dobbie has collapsable trusses...why not a refractor?

(Might affect the internal baffling and final optical alignment?)

[captaincaveman]

You mean like the ol' Captain's three pull telescopes??

Good question!

The Dobbie has collapsable trusses...why not a refractor?

(Might affect the internal baffling and final optical alignment?)

Yeah, thats the type, think you can get pocket spotting scopes(brass jobbies), i would have thought it would be a workable thing though, in this day and age.

Heres hoping someone will do it, then i can add a 120mm refractor without losing a quarter of my storage space:D

If not, maybe a three piece screw together?

[Capricorn]

I would guess that it is a case of rigidity. To get a multisection rigid enough that the lens remains central would mean a very substantial set of tubes with a very tight fit. They would weigh a lot more then a single tube. No baffles in any of the upper sections either would be possible.

I could easily see one sagging by say 1/2mm and this is too much for the accuracy that is required these days for the uses/purposes that astronomical scopes are required to do.

[captaincaveman]

yeah, just had one of them thoughts while looking at size of larger refractors and thought hmmm:D