Which Barlow lens for SW 130P DS

[robmichael81]

Does anyone have any idea what barlow lens would be suitable for planetary imaging with a SW130 PDS?

[mwayne]

Check out warmweatherguy on YouTube,  his thinking is that in order to take maximum advantage of aperture the ultimate focal length needs to be tied in to the pixel size of your camera. For a ZWOASI120MC,  F25 works well for me.

[michael.h.f.wilkinson]

Pixel size is key, indeed. I find F/16-F/20 works best for me on the ASI120MC, but F/25-F/30 is better for the ASI174MM with its bigger pixels. An F/5 scope requires something like a 4x Barlow or PowerMate for an ASI120MC.

[robmichael81]

Thanks for the advice, 

Is there a specific type of Barlow I should look for? It's just I know that in some instances it's difficult to reach focus when imaging with newtonians.

 

Rob