Astroimaging with an achromatic refractor

[RichardJ (Richard)]

I was imaging the other night with my 150mm F5 Newtonian and whilst waiting for some high cloud to clear I thought I would see what sort of image I could get with my Canon 600D DSLR, 2" Baader UHC-S L Booster filter and a 102mm F5 achromatic refractor. I left the coma corrector in for the shot with the Baader filter. These are single shots.

I was surprised and pleased by the result considering the cost of an ED or APO scope. I also tried the combination on the Rosette and Horsehead and got some good results. I also tried the Baader Semi APO filter and in my opinion thought the UHC-S filter was a bit better.

I'd be interested in other people's experience with filters and achromats.

RichardJ

[RichardJ (Richard)]

I've added the shots of the Horsehead and Rosette. More subs needed, but promising.

RichardJ

[skysurfer]

Well, adding narrowband filters or at least UHC will reduce color errors considerably.
Another option (never tried) can be making separate R,G and B frames and stacking them together. CCD cameras with filter wheels work this way.

[Atmos (Colin)]

It has made quite a substantial improvement! If you don't mind the diffraction spikes then I imagine the newtonian probably does a better job