Hi all,
Just looking at using my Takahashi Barlow attached directly to an eyepiece to give me a specific focal length.
This barlow was designed to be used before the diagonal so I'm wondering if there's a formula for calculating the magnification change when used this way?
Is it as simple as the % in focal length difference by moving the Barlow and then applied to the barow magnification?
Any help would be much appreciated!!
Cheers