Extension tubes

[matt]

Just spotted these on Astromart

http://www.astromart.com/classifieds...fied_id=436668

Any advice from the "imaging gang" whether each or both would be useful to me for planetary imaging with my 9.25 and ToUcam???

I also have a 2x Ultima Barlow and 2.5x Powermate.

Thanks guys

[[1ponders] (Paul)]

Matt, I use one of these. It can be used as just an extension tube or for either negative projection and extension tube with a barlow, or positive projection with an eyepiece. The only thing is you need a differenct adapter than the 1.25 standard that is normally used. You need the other one here, the ToUcam "T" thread adapter (below the standard one just down the page.)

You can get cheaper no name ones around the place though bintel have the meade for $74 (less 10% for the new shop special, if you get in quick)

[asimov (John)]

I think you already know an extension tube & the 2.5X don't mix, so the extension tube(s) will only work with the 2X.

Got a diagonal? that will turn the 2X into a 3X...Not sure what it would do with a 2.5X.

I use a 75mm extension tube with 2X barlow in crook seeing, 2 / 75mm tubes in the 2X barlow in average seeing & I'll throw the diagonal in with either 1 or 2 tubes, depending on the seeing.