[avandonk]

I just purchased a Skywatcher 150mm F5 Achro. Here is a pic with the modded 100ED as a guidescope. The other picture is a single JPG straight from the 5DH. Exposure details 8 min at 1600ISO with Hutech focal reducer (0.85) and Astronomik HA filter. Focus could be better. The intention is to use it for narrowband data and just simply establish focus position for any filter and recombine the data with no chromatic aberration!

The Hutech FR is flattening the field very well. Will post a combined image when I get the data as it is a race against predicted rain.

I reckon this will work.

Bert