Here is a quick combined image. No flats.
HA 8x8 min at 1600ISO
O3 6x8 min at 1600ISO
HA red to Red
O3 green to Green
O3 blue to Blue
Large image 1.1MB
http://members.optusnet.com.au/~fmle...b_acr_01_6.jpg
As you can see the field is nice and flat even to the corners. I am going to have to install a larger aperture focuser as there is some vignetting. The central part of the image sees the whole of the 150mm achromatic lens.
The actual focal length of the scope with the Hutech FR is now 670mm and the f ratio is now f/4.46. This matches quite well to the modded 100ED (FL =686mm )for focal length.
The real aim is to mix colour images from the 100ED with narrow band from the 150mm F5 now 150mm F4.5. This should get most of the really faint nebular data.
Now where is my hacksaw?
Bert