toUcam extension tube

[asimov (John)]

Mick Pinner was kind enough to send me a .965"-1 1/4" eyepiece adapter the other day that I was going to use on my little 4.5" reflector so I could use my standard 1 1/4" EPs in. (Ta Mick)

Unfortunately it was the wrong kind, so I ended up using it as an extension tube between the 2X barlow & the CCD. Works a treat! Gained about 3 1/2"-4" in length & the image scale on mars for instance is quite noticable.

All I need is good seeing now to take advantage of it!

Nothing gets wasted at my place, if a gadget won't fit on one thing I'll eventually use it for something else, lol.

[Robert_T]

Good Stuff Asi - love the pioneer, make use of anything spirit - with that extra length you must be up to almost 3x. If you wanted to work out exactly what you're getting from your barlow now take a look at the article link attached below - i used this to work out what I was getting by using extension tube and/or star diagonal between barlow and webcam. The maths gets a bit heady (for me) but muddled through it. You need to work out your barlow's focal length by playing aroun with focussing light from it onto some card.

http://www.astunit.com/tutorials/barlow.htm

Look forward to seeing you put all that new image scale to good use

cheers,