GSO 1.25" Apo Apochromatic Barlow

Hi All
How good are the GSO 1.25" 5x Apo Apochromatic and GSO 1.25" 2.5x Apo Apochromatic Barlow, cant find much on them
Vars

Using the words "Apo Barlow" is strictly a marketing game. At normal powers all Barlows are essentially apochromatic, regardless if they are 2 element or have 3 or more elements. It's not until you get to very high magnifications, around 8x when you might get a bit of color using a normal Barlow.

Rolando