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Old 21-01-2018, 03:39 PM
RichardJ (Richard)
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Astroimaging with an achromatic refractor

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
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Last edited by RichardJ; 21-01-2018 at 04:54 PM.
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Old 21-01-2018, 07:41 PM
RichardJ (Richard)
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I've added the shots of the Horsehead and Rosette. More subs needed, but promising.

RichardJ
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Old 21-01-2018, 08:00 PM
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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.
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Old 21-01-2018, 08:47 PM
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Atmos (Colin)
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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
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