鋁筒或碳纖筒

[jj12667]

其實我見過jj12667枝10" F5牛頓鏡，用玻璃纖維做鏡筒，其實都已經好輕好硬。

我果支系F4.5唔系F5！

[anguslau]

Check this site for CF tubes (up to 8") and please also check your wallet:

http://www.carbon-tube.com/round.php

Thanks, Peter! Do you know of similar sources in China?

Actually I think the prices are not too radiculously high. But of cause, shipping will add significantly to it. And we really need larger sizes for telescope making...

[anguslau]

其實我見過jj12667枝10" F5牛頓鏡，用玻璃纖維做鏡筒，其實都已經好輕好硬。

我果支系F4.5唔系F5！

jj, do you know of sources for these tubes in the mainland?

[Tan14]

This company in USA can provide CF tube up to 21" diameter ...

For such company in China, I have no ideas at this moment.

http://www.nimcor.com/carbon_tubes.html