Barlow Basics: Stubby or Long?

I am shopping for a 3X 1.25" barlow.
I see that (for both 2x and 3x) most are long, but a few are stubby.
The stubby ones seem to be intended mainly for smaller SC-type scopes, but is there any advantages or disadvantages to using a shorty barlow as opposed to a regular/longer one in other types of telescopes?

I have a 100mm F/6 refractor telescope and already have a 2X barlow of the longer type.
~

I have a longer Barlow and I know there are proponents of both, I like mine. There are other guys that will swear by the shortys. What kind of views are you getting through the 2x barlow?

I believe that the theory is that the stubby barlows require a more radical alteration of the light cone, and are therefore more difficult to correct for aberations, especially in faster scopes.

In practical terms it's another matter.

I am shopping for a 3X 1.25" barlow.
I see that (for both 2x and 3x) most are long, but a few are stubby.
The stubby ones seem to be intended mainly for smaller SC-type scopes, but is there any advantages or disadvantages to using a shorty barlow as opposed to a regular/longer one in other types of telescopes?

I have a 100mm F/6 refractor telescope and already have a 2X barlow of the longer type.
~
-----------

Since according to your later post you haven't yet tried the 2x barlow, I would wait and see how that goes.

Some thoughts:

1. A 2x barlow placed ahead of the diagonal works as a 3x barlow. Sometimes it may not come to focus.

2. I prefer shorties. One reason is that shorties make a more soild optical train, an long barlow make for a pretty sketchy/shaky eyepiece. There is also the issue of the need for a long insertion length..

3. If your scope is an Orion 100mmF6 refractor, my experience with this scope is that the magnifications over about 125x-150x are mostly useful for double stars. My best planetary views have been around 125x.

jon

University Optics has a 2.8X Klee Barlow that equals a Televue Powermate for one third the cost. Just buy the damn thing and enjoy!