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Hi again StutzJr,
Regarding your query about field of view[F.O.V.]. I'l try and keep it short, but here goes. There are several benefits to be had
by using a barlow. The light passing through a barlow diverges and typically doubles or triples the focal length of the scope being used.
The longer the focal length, the less obvious any optical aberrations
in the optical train become.[ can only be good].
The longer the focal length of a scope, the easier it is to achieve
a really good focus.[short F.L. Newtonians can be fiddly to focus well].
A barlow significantly improves the eye relief of any eyepiece it is
used with, meaning that, especially with short F.L. eyepieces, you don't
need to have your eye jammed up against the eyepiece, trying to look through a tiny 5 or 6mm diameter lens.
If you look through a 12mm E.P. you will have a certain F.O.V. If you
add a barlow, you will double the magnification and halve the F.O.V.
which is exactly what a 6mm E.P. does. So in short, why would you
use a 6mm when you can have a better experience with a larger lens
to look through and better eye relief with 12mm +barlow,[provided
that the barlow is of good quality].
Incidentally, I really love my Seben 8-24mm zoom, the quality
is amazing for the price.
Hope it all helped.
raymo
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