SW 2" ED Barlow in SW 200p woes.

[rwilkey]

Hi, I thought it was me being silly when I first used it, but to be honest, it is so long since I have used it, I used it with my 200P, but since I had a stroke in May 2010, I have not been able to use this telescope and now use my more manageable C100ED with 1.25" ep's. I did not use any adaptors I can say.

[frogdr1ver]

Thanks again, looks like i need to have a bit more of a play when i get home. Probably doing something daft. Just thought it was odd that the barlow was only just in the focuser.

[rwilkey]

Hi Frogdr1ver, I think that would be the best thing, let us know how you get on....

[russ.will]

I'd forgotten about this thread. I must give Colin a prod to see if it's been possible to machine a 40mm extension tube to the draw tube (rather than one that fits in the compression ring) that will solve this common issue.

FWIW, I took the 2" ED barlow to S'n'S to see if different models of the 2" focuser make a difference. The answer, had I thought this through in advance, is that of course they don't.

The issue isn't the diametre of the draw tube. It could be a metre wide, but if the compression ring fitted to it is 2", then any extension tube that fits inside that, will have a bore of less than 2".

I'll get on it tomorrow.

Russell

[rwilkey]

Some models of the SW200P have a collar inside the focuser tube which may inhibit, whereas later models were modified, could this be the problem? I have checked my 2" ED Barlow and the barrel is smaller so that it fits snugly in the focuser, which has set screws, not a compression ring.

[spaceboy]

For what it's worth this was my answer to a similar problem getting my 31mm Nag to fit in the extension tube with a castel filter fitted. http://stargazerslounge.com/discussions-scopes-whole-setups/162426-gso-focuser-2-eyepieces.html#post2020972