Revelation focuser and ED barlow not mating!

[kidlands]

Went to use them together tonight but the barlow wont go all the way home. There seems to be a small ridge in the focuser but surely the barlow should fit a same make focuser?

Is it me or will these two not go together?

Revelation Dual speed crayford focuser

Revelation 2"ED barlow

Steve

[John]

The 2" Revelation ED has a long barrel as far as I recall. The focuser will start to be ribbed inside after a certain distance to reduce light scatter. I'm sure there was a similar post from someone on here quite recently - I think they had to get the inside of the focus tube machined out.

Revelation is only a brand name - they don't actually make any of their stuff - these two items could come from different sources in China / Taiwan.

Edit: I think this is the thread I was thinking of (GSO make some of the Revelation stuff):

http://stargazerslounge.com/discussions-scopes-whole-setups/162426-gso-focuser-2-eyepieces.html

[kidlands]

Excellent thanks John. Looks like the barlow will be in the for sale section asap.

[Lorne]

Can you get 2" eyepieces to focus in the revelation dual speed? (Low Profile) I couldnt and have to use a 35mm extension tube, it may be that you need the extension tube too.

**Edited** just checked and its the same 34mm before it narrows on the focuser AND the extension tube.

[kidlands]

Well I tried my 2" 32mm panaview and it fitted ok but havn't tried to focus with it. My Hyperion focused with no problems.

What make and where did you get the extension tube from?

[Lorne]

I got 2 extension tubes, a 50mm branded Revelation when I bought the focuser from Telescope House, and a 35mm branded Altair from ebay, though they both look as if they were made in the same factory! I couldnt get anything to focus without an extension of any length when I first fitted the focuser.

[Hypernova]

I had trouble getting the majority of my 1.25" eyepieces to focus when I first bought my GSO focuser. That was because it only has 30mm of travel and nearly every extension tube is 40mm or longer thus leaving a gap in the focal range. I had to have a regular 2" 50mm extension milled down to 25mm to allow all of my eyepieces to focus.

That hasn't eradicated the problem of my UWAN with its long barrel, I had to get the ribs you speak of milled down as they were narrowing the diameter of the tube by 0.47mm and stopping the eyepiece from fully inserting. Now that I have that sorted I still cannot focus it as there is not enough outward travel in the drawtube. And since the barrel is so long I cannot use my custom short extension as that would leave a considerable portion of the barrel sticking out which is not what I want with a 1kg, £200 eyepiece! I think I'll be after a new focuser as I don't think its worth my while to shorten the tube or bring the primary closer to the secondary.