I have a 2" 2x ED barlow which I've been using with my f7.5 80mm refractor, with a 2 inch diagonal. Was wondering if there is a difference in magnification when I put this before the diagonal? Unfortunately, I cannot seem to get focus when it is used "after" the diagonal.
There seems to be an increase but I'm not sure if I am just imagining it.
The longer the tube lenght of the barlow , the more magnification you get.
But, a 2x balow is not really made for that.
This means , as long as the picture looks good , just put it where you can get focus.
Just my opinion
WO 80mm + WO 2” diagonal + WO x2 Barlow + eyepiece = focus.
WO 80mm + WO x2 Barlow + WO 2” diagonal + eyepiece = no focus.
However, in my SCT and Vixen refractor, I have noticed that if the Barlow is placed BEFORE the diagonal, you do get an increase in barlow amplification.
Just did a bit more searching and it seems that a 2x barlow will get around 3x magnification when placed in front of the diagonal, which seems to align with what I was experiencing: http://www.bpccs.com/lcas/Articles/barlow.htm
