Yes. Just like in visual, a Barlow will magnify what you are trying to image. The ammount of magnification depends where the Barlow is installed in the imaging train. Closer to the sensor = less magnification, further from the sensor = more magnification.

Ed D

 

Thank you Ed for your reply. I think I did not clearly convey what I wanted to ask..
Lets say you have two eyepieces... a 10mm with a 60degree FOV and a 20 mm also with a 60 degree FOV. Everything else the same.
If you put a 2x barlow on the latter would the image produced via AP be as clear as that with the former EP?

 

Provided you are using a fairly decent Barlow the 20mm eyepiece will give a view like the 10mm eyepiece. Image degradation comes into play when magnification is too high for the scope no matter if it's a high power eyepiece or a barlowed lower power one. Also, an image gets dimmer as you increase the magnification, no matter if you increase the magnification with an eyepiece or an equivalent eyepiece and Barlow combination.

Many planetary observers like to use simpler eyepieces, such as Plossls and Orthoscopic. In order to get high magnification without using an eyepiece with a small eye lens they use a longer focal length eyepiece with a Barlow. One of my favorite combinations for planetary is a 15mm Vixen Plossl with a Tele Vue 3x Barlow. I get the magnification of a 5mm eyepiece with the comfort of the larger eye lens of the 15mm.

Ed

 

Thanks for the enlightenment Ed. By the way I like your pooch!