Crayford low profile focuser

[wils07]

Will the above fit a SW130p as the info on it says it will fit telescopes between 9 - 15" aperture .

[Cornelius Varley]

The focuser fits 9-13" tubes. The SW130 is 5.5".

Peter

[Moonshane]

BUT you can always shim the base up a little. the only problem is that the base will press down on the tube if you don't raise it slightly. anything will do really but some strip aluminium painted black and cut to size would look good.

see post #2 here http://stargazerslounge.com/diy-astronomer/115026-ongoing-mods-my-orion-optics-uk-6-f11-planetary-dobsonian.html which will illustrate the point. this is a 6" mirror tube and a focuser designed for 9"+ it's the revelation one from Telescope House (or very similar) - costs about £90 new.

[John]

I think the 130p has a 1.25" focuser as standard. Assuming the crayford is 2", you will probably need to enlarge the hole in the tube to accommodate the larger diameter focuser tube.

[Moonshane]

good point John. this is easily done with a marker pen and a half round file. opens up a lot of possibilities re eyepieces.

[wils07]

Well i think it will work as the focuser now has a 2" - 1.25" fitting in so i don`t think i will need to file anything.

So im going to give it a go tommorrow and i will post some pics as i go along as i believe by packing the focuser it will fit or i will make it fit lol.

[John]

Well i think it will work as the focuser now has a 2" - 1.25" fitting in so i don`t think i will need to file anything.

So im going to give it a go tommorrow and i will post some pics as i go along as i believe by packing the focuser it will fit or i will make it fit lol.

Sounds like the scope already has a 2" focuser on it then - that should help things a lot

Let us know how the conversion goes

[wils07]

Good news its on!!! well as a dry fit it is

After 45mins of measuring and working out i drilled the four new holes in the tube and with 4 x 9mm packings the focuser fits well and after a collamination test all was well.

So when i finish the install properly and tidy it up some more i will post up some pics.